kernel: netlink based system stats interface
Add generic netlink based interface to pass various system statistics to userspace. Change-Id: I362c696ade2c5a424516728010122fec54a1a71b Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Vinayak Menon
parent
6c5fba7425
commit
954aeed7b5
92
include/uapi/linux/msm_sysstats.h
Normal file
92
include/uapi/linux/msm_sysstats.h
Normal file
@ -0,0 +1,92 @@
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/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
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/*
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* Copyright (c) 2021, The Linux Foundation. All rights reserved.
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*/
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#ifndef _UAPI_MSM_SYSSTATS_H_
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#define _UAPI_MSM_SYSSTATS_H_
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#include <linux/types.h>
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#define SYSSTATS_GENL_NAME "SYSSTATS"
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#define SYSSTATS_GENL_VERSION 0x1
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#define TS_COMM_LEN 32
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#define SYSSTATS_TYPE_UNSPEC 0
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#define SYSSTATS_TASK_TYPE_STATS 1
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#define SYSSTATS_TYPE_NULL 2
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#define SYSSTATS_TASK_TYPE_FOREACH 3
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#define SYSSTATS_MEMINFO_TYPE_STATS 4
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#define SYSSTATS_CMD_ATTR_UNSPEC 0
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#define SYSSTATS_TASK_CMD_ATTR_PID 1
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#define SYSSTATS_TASK_CMD_ATTR_FOREACH 2
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#define SYSSTATS_CMD_UNSPEC 0
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#define SYSSTATS_TASK_CMD_GET 1
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#define SYSSTATS_TASK_CMD_NEW 2
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#define SYSSTATS_MEMINFO_CMD_GET 3
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#define SYSSTATS_MEMINFO_CMD_NEW 4
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struct sysstats_task {
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__u64 anon_rss; /* KB */
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__u64 file_rss; /* KB */
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__u64 swap_rss; /* KB */
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__u64 shmem_rss; /* KB */
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__u64 unreclaimable; /* KB */
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__u64 utime; /* User CPU time [usec] */
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__u64 stime; /* System CPU time [usec] */
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__u64 cutime; /* Cumulative User CPU time [usec] */
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__u64 cstime; /* Cumulative System CPU time [usec] */
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__s16 oom_score;
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__s16 __padding;
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__u32 pid;
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__u32 uid;
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__u32 ppid; /* Parent process ID */
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char name[TS_COMM_LEN]; /* Command name */
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char state[TS_COMM_LEN]; /* Process state */
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};
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/*
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* All values in KB.
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*/
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struct sysstats_mem {
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__u64 memtotal;
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__u64 misc_reclaimable;
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__u64 unreclaimable;
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__u64 zram_compressed;
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__u64 swap_used;
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__u64 swap_total;
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__u64 buffer;
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__u64 vmalloc_total;
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__u64 swapcache;
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__u64 slab_reclaimable;
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__u64 slab_unreclaimable;
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__u64 free_cma;
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__u64 file_mapped;
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__u64 pagetable;
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__u64 kernelstack;
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__u64 shmem;
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__u64 dma_nr_free;
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__u64 dma_nr_active_anon;
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__u64 dma_nr_inactive_anon;
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__u64 dma_nr_active_file;
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__u64 dma_nr_inactive_file;
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__u64 normal_nr_free;
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__u64 normal_nr_active_anon;
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__u64 normal_nr_inactive_anon;
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__u64 normal_nr_active_file;
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__u64 normal_nr_inactive_file;
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__u64 movable_nr_free;
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__u64 movable_nr_active_anon;
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__u64 movable_nr_inactive_anon;
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__u64 movable_nr_active_file;
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__u64 movable_nr_inactive_file;
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__u64 highmem_nr_free;
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__u64 highmem_nr_active_anon;
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__u64 highmem_nr_inactive_anon;
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__u64 highmem_nr_active_file;
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__u64 highmem_nr_inactive_file;
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};
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#endif /* _UAPI_MSM_SYSSTATS_H_ */
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10
init/Kconfig
10
init/Kconfig
@ -567,6 +567,16 @@ config TASKSTATS
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Say N if unsure.
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config MSM_SYSSTATS
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tristate "Export system/task statistics through netlink"
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depends on NET
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depends on MULTIUSER
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help
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Export system and task statistics through generic netlink
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interface. Userspace can retrieve these statistics via netlink
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socket.
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If unsure, say N
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config TASK_DELAY_ACCT
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bool "Enable per-task delay accounting"
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depends on TASKSTATS
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@ -98,6 +98,7 @@ obj-$(CONFIG_RELAY) += relay.o
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obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
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obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
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obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
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obj-$(CONFIG_MSM_SYSSTATS) += msm_sysstats.o
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obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
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obj-$(CONFIG_LATENCYTOP) += latencytop.o
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obj-$(CONFIG_FUNCTION_TRACER) += trace/
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507
kernel/msm_sysstats.c
Normal file
507
kernel/msm_sysstats.c
Normal file
@ -0,0 +1,507 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/msm_sysstats.h>
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#include <linux/percpu.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/pid_namespace.h>
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#include <net/genetlink.h>
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#include <linux/atomic.h>
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#include <linux/sched/cputime.h>
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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struct tgid_iter {
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unsigned int tgid;
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struct task_struct *task;
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};
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static struct genl_family family;
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static DEFINE_PER_CPU(__u32, sysstats_seqnum);
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#define SYSSTATS_CMD_ATTR_MAX 2
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static const struct nla_policy sysstats_cmd_get_policy[SYSSTATS_CMD_ATTR_MAX + 1] = {
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[SYSSTATS_TASK_CMD_ATTR_PID] = { .type = NLA_U32 },
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[SYSSTATS_TASK_CMD_ATTR_FOREACH] = { .type = NLA_U32 },};
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static int sysstats_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
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struct genl_info *info)
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{
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const struct nla_policy *policy = NULL;
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switch (ops->cmd) {
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case SYSSTATS_TASK_CMD_GET:
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policy = sysstats_cmd_get_policy;
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break;
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case SYSSTATS_MEMINFO_CMD_GET:
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break;
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default:
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return -EINVAL;
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}
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return nlmsg_validate_deprecated(info->nlhdr, GENL_HDRLEN,
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SYSSTATS_CMD_ATTR_MAX, policy,
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info->extack);
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}
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static int send_reply(struct sk_buff *skb, struct genl_info *info)
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{
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struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
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void *reply = genlmsg_data(genlhdr);
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genlmsg_end(skb, reply);
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return genlmsg_reply(skb, info);
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}
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static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
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size_t size)
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{
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struct sk_buff *skb;
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void *reply;
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skb = genlmsg_new(size, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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if (!info) {
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int seq = this_cpu_inc_return(sysstats_seqnum) - 1;
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reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
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} else
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reply = genlmsg_put_reply(skb, info, &family, 0, cmd);
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if (reply == NULL) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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*skbp = skb;
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return 0;
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}
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static struct task_struct *find_lock_task_mm(struct task_struct *p)
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{
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struct task_struct *t;
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rcu_read_lock();
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for_each_thread(p, t) {
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task_lock(t);
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if (likely(t->mm))
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goto found;
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task_unlock(t);
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}
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t = NULL;
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found:
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rcu_read_unlock();
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return t;
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}
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static struct sighand_struct *sysstats_lock_task_sighand(struct task_struct *tsk,
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unsigned long *flags)
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{
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struct sighand_struct *sighand;
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rcu_read_lock();
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for (;;) {
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sighand = rcu_dereference(tsk->sighand);
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if (unlikely(sighand == NULL))
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break;
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spin_lock_irqsave(&sighand->siglock, *flags);
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if (likely(sighand == tsk->sighand))
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break;
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spin_unlock_irqrestore(&sighand->siglock, *flags);
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}
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rcu_read_unlock();
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return sighand;
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}
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static int sysstats_task_cmd_attr_pid(struct genl_info *info)
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{
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struct sysstats_task *stats;
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struct sk_buff *rep_skb;
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struct nlattr *ret;
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struct task_struct *tsk;
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struct task_struct *p;
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size_t size;
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u32 pid;
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int rc;
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u64 utime, stime;
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const struct cred *tcred;
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#ifdef CONFIG_CPUSETS
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struct cgroup_subsys_state *css;
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#endif
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unsigned long flags;
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struct signal_struct *sig;
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size = nla_total_size_64bit(sizeof(struct sysstats_task));
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rc = prepare_reply(info, SYSSTATS_TASK_CMD_NEW, &rep_skb, size);
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if (rc < 0)
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return rc;
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rc = -EINVAL;
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pid = nla_get_u32(info->attrs[SYSSTATS_TASK_CMD_ATTR_PID]);
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ret = nla_reserve_64bit(rep_skb, SYSSTATS_TASK_TYPE_STATS,
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sizeof(struct sysstats_task), SYSSTATS_TYPE_NULL);
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if (!ret)
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goto err;
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stats = nla_data(ret);
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rcu_read_lock();
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tsk = find_task_by_vpid(pid);
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if (tsk)
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get_task_struct(tsk);
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rcu_read_unlock();
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if (!tsk) {
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rc = -ESRCH;
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goto err;
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}
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memset(stats, 0, sizeof(*stats));
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stats->pid = task_pid_nr_ns(tsk, task_active_pid_ns(current));
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p = find_lock_task_mm(tsk);
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if (p) {
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__acquire(p->alloc_lock);
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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stats->anon_rss = K(get_mm_counter(p->mm, MM_ANONPAGES));
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stats->file_rss = K(get_mm_counter(p->mm, MM_FILEPAGES));
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stats->shmem_rss = K(get_mm_counter(p->mm, MM_SHMEMPAGES));
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stats->swap_rss = K(get_mm_counter(p->mm, MM_SWAPENTS));
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#undef K
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task_unlock(p);
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}
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task_cputime(tsk, &utime, &stime);
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stats->utime = div_u64(utime, NSEC_PER_USEC);
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stats->stime = div_u64(stime, NSEC_PER_USEC);
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if (sysstats_lock_task_sighand(tsk, &flags)) {
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sig = tsk->signal;
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stats->cutime = sig->cutime;
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stats->cstime = sig->cstime;
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unlock_task_sighand(tsk, &flags);
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}
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rcu_read_lock();
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tcred = __task_cred(tsk);
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stats->uid = from_kuid_munged(current_user_ns(), tcred->uid);
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stats->ppid = pid_alive(tsk) ?
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task_tgid_nr_ns(rcu_dereference(tsk->real_parent),
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task_active_pid_ns(current)) : 0;
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rcu_read_unlock();
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strlcpy(stats->name, tsk->comm, sizeof(stats->name));
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#ifdef CONFIG_CPUSETS
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css = task_get_css(tsk, cpuset_cgrp_id);
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cgroup_path_ns(css->cgroup, stats->state, sizeof(stats->state),
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current->nsproxy->cgroup_ns);
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css_put(css);
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#endif
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put_task_struct(tsk);
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return send_reply(rep_skb, info);
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err:
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nlmsg_free(rep_skb);
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return rc;
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}
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static int sysstats_task_user_cmd(struct sk_buff *skb, struct genl_info *info)
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{
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if (info->attrs[SYSSTATS_TASK_CMD_ATTR_PID])
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return sysstats_task_cmd_attr_pid(info);
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else
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return -EINVAL;
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}
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static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
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{
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struct pid *pid;
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if (iter.task)
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put_task_struct(iter.task);
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rcu_read_lock();
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retry:
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iter.task = NULL;
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pid = idr_get_next(&ns->idr, &iter.tgid);
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if (pid) {
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iter.tgid = pid_nr_ns(pid, ns);
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iter.task = pid_task(pid, PIDTYPE_TGID);
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if (!iter.task) {
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iter.tgid += 1;
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goto retry;
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}
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get_task_struct(iter.task);
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}
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rcu_read_unlock();
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return iter;
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}
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static int sysstats_task_foreach(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct pid_namespace *ns = task_active_pid_ns(current);
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struct tgid_iter iter;
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void *reply;
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struct nlattr *attr;
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struct nlattr *nla;
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struct sysstats_task *stats;
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struct task_struct *p;
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short oom_score;
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short oom_score_min;
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short oom_score_max;
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u32 buf;
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nla = nla_find(nlmsg_attrdata(cb->nlh, GENL_HDRLEN),
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nlmsg_attrlen(cb->nlh, GENL_HDRLEN),
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SYSSTATS_TASK_CMD_ATTR_FOREACH);
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if (!nla)
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goto out;
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buf = nla_get_u32(nla);
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oom_score_min = (short) (buf & 0xFFFF);
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oom_score_max = (short) ((buf >> 16) & 0xFFFF);
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iter.tgid = cb->args[0];
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iter.task = NULL;
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for (iter = next_tgid(ns, iter); iter.task;
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iter.tgid += 1, iter = next_tgid(ns, iter)) {
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if (iter.task->flags & PF_KTHREAD)
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continue;
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oom_score = iter.task->signal->oom_score_adj;
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if ((oom_score < oom_score_min)
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|| (oom_score > oom_score_max))
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continue;
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reply = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, &family, 0, SYSSTATS_TASK_CMD_GET);
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if (reply == NULL) {
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put_task_struct(iter.task);
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break;
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}
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attr = nla_reserve(skb, SYSSTATS_TASK_TYPE_FOREACH,
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sizeof(struct sysstats_task));
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if (!attr) {
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put_task_struct(iter.task);
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genlmsg_cancel(skb, reply);
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break;
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}
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stats = nla_data(attr);
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memset(stats, 0, sizeof(struct sysstats_task));
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rcu_read_lock();
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stats->pid = task_pid_nr_ns(iter.task,
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task_active_pid_ns(current));
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stats->oom_score = iter.task->signal->oom_score_adj;
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rcu_read_unlock();
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p = find_lock_task_mm(iter.task);
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if (p) {
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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__acquire(p->alloc_lock);
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stats->anon_rss =
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K(get_mm_counter(p->mm, MM_ANONPAGES));
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stats->file_rss =
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K(get_mm_counter(p->mm, MM_FILEPAGES));
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stats->shmem_rss =
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K(get_mm_counter(p->mm, MM_SHMEMPAGES));
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stats->swap_rss =
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K(get_mm_counter(p->mm, MM_SWAPENTS));
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task_unlock(p);
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#undef K
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}
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genlmsg_end(skb, reply);
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}
|
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cb->args[0] = iter.tgid;
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out:
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return skb->len;
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}
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|
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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#ifndef CONFIG_NUMA
|
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static void sysstats_fill_zoneinfo(struct sysstats_mem *stats)
|
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{
|
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pg_data_t *pgdat;
|
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struct zone *zone;
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struct zone *node_zones;
|
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unsigned long zspages = 0;
|
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|
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pgdat = NODE_DATA(0);
|
||||
node_zones = pgdat->node_zones;
|
||||
|
||||
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
|
||||
if (!populated_zone(zone))
|
||||
continue;
|
||||
|
||||
zspages += zone_page_state(zone, NR_ZSPAGES);
|
||||
if (!strcmp(zone->name, "DMA")) {
|
||||
stats->dma_nr_free =
|
||||
K(zone_page_state(zone, NR_FREE_PAGES));
|
||||
stats->dma_nr_active_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
|
||||
stats->dma_nr_inactive_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
|
||||
stats->dma_nr_active_file =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
|
||||
stats->dma_nr_inactive_file =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
|
||||
} else if (!strcmp(zone->name, "Normal")) {
|
||||
stats->normal_nr_free =
|
||||
K(zone_page_state(zone, NR_FREE_PAGES));
|
||||
stats->normal_nr_active_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
|
||||
stats->normal_nr_inactive_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
|
||||
stats->normal_nr_active_file =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
|
||||
stats->normal_nr_inactive_file =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
|
||||
} else if (!strcmp(zone->name, "HighMem")) {
|
||||
stats->highmem_nr_free =
|
||||
K(zone_page_state(zone, NR_FREE_PAGES));
|
||||
stats->highmem_nr_active_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
|
||||
stats->highmem_nr_inactive_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
|
||||
stats->highmem_nr_active_file =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
|
||||
stats->highmem_nr_inactive_file =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
|
||||
} else if (!strcmp(zone->name, "Movable")) {
|
||||
stats->movable_nr_free =
|
||||
K(zone_page_state(zone, NR_FREE_PAGES));
|
||||
stats->movable_nr_active_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
|
||||
stats->movable_nr_inactive_anon =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
|
||||
stats->movable_nr_active_file =
|
||||
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
|
||||
stats->movable_nr_inactive_file =
|
||||
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
|
||||
}
|
||||
}
|
||||
stats->zram_compressed = K(zspages);
|
||||
}
|
||||
#elif
|
||||
static void sysstats_fill_zoneinfo(struct sysstats_mem *stats)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
static void sysstats_build(struct sysstats_mem *stats)
|
||||
{
|
||||
struct sysinfo i;
|
||||
|
||||
si_meminfo(&i);
|
||||
si_swapinfo(&i);
|
||||
|
||||
stats->memtotal = K(i.totalram);
|
||||
stats->misc_reclaimable =
|
||||
global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE) >> 10;
|
||||
stats->buffer = K(i.bufferram);
|
||||
stats->swap_used = K(i.totalswap - i.freeswap);
|
||||
stats->swap_total = K(i.totalswap);
|
||||
stats->vmalloc_total = K(vmalloc_nr_pages());
|
||||
stats->swapcache = K(total_swapcache_pages());
|
||||
stats->slab_reclaimable =
|
||||
K(global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B));
|
||||
stats->slab_unreclaimable =
|
||||
K(global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B));
|
||||
stats->free_cma = K(global_zone_page_state(NR_FREE_CMA_PAGES));
|
||||
stats->file_mapped = K(global_node_page_state(NR_FILE_MAPPED));
|
||||
stats->kernelstack = global_node_page_state(NR_KERNEL_STACK_KB);
|
||||
stats->pagetable = K(global_zone_page_state(NR_PAGETABLE));
|
||||
stats->shmem = K(i.sharedram);
|
||||
sysstats_fill_zoneinfo(stats);
|
||||
}
|
||||
#undef K
|
||||
|
||||
static int sysstats_meminfo_user_cmd(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
int rc = 0;
|
||||
struct sk_buff *rep_skb;
|
||||
struct sysstats_mem *stats;
|
||||
struct nlattr *na;
|
||||
size_t size;
|
||||
|
||||
size = nla_total_size(sizeof(struct sysstats_mem));
|
||||
|
||||
rc = prepare_reply(info, SYSSTATS_MEMINFO_CMD_NEW, &rep_skb,
|
||||
size);
|
||||
if (rc < 0)
|
||||
goto err;
|
||||
|
||||
na = nla_reserve(rep_skb, SYSSTATS_MEMINFO_TYPE_STATS,
|
||||
sizeof(struct sysstats_mem));
|
||||
if (na == NULL) {
|
||||
nlmsg_free(rep_skb);
|
||||
rc = -EMSGSIZE;
|
||||
goto err;
|
||||
}
|
||||
|
||||
stats = nla_data(na);
|
||||
memset(stats, 0, sizeof(*stats));
|
||||
|
||||
sysstats_build(stats);
|
||||
|
||||
rc = send_reply(rep_skb, info);
|
||||
err:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static const struct genl_ops sysstats_ops[] = {
|
||||
{
|
||||
.cmd = SYSSTATS_TASK_CMD_GET,
|
||||
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
||||
.doit = sysstats_task_user_cmd,
|
||||
.dumpit = sysstats_task_foreach,
|
||||
},
|
||||
{
|
||||
.cmd = SYSSTATS_MEMINFO_CMD_GET,
|
||||
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
||||
.doit = sysstats_meminfo_user_cmd,
|
||||
},
|
||||
};
|
||||
|
||||
static struct genl_family family __ro_after_init = {
|
||||
.name = SYSSTATS_GENL_NAME,
|
||||
.version = SYSSTATS_GENL_VERSION,
|
||||
.maxattr = SYSSTATS_CMD_ATTR_MAX,
|
||||
.module = THIS_MODULE,
|
||||
.ops = sysstats_ops,
|
||||
.n_ops = ARRAY_SIZE(sysstats_ops),
|
||||
.pre_doit = sysstats_pre_doit,
|
||||
};
|
||||
|
||||
static int __init sysstats_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = genl_register_family(&family);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
pr_info("registered sysstats version %d\n", SYSSTATS_GENL_VERSION);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit sysstats_exit(void)
|
||||
{
|
||||
genl_unregister_family(&family);
|
||||
}
|
||||
|
||||
module_init(sysstats_init);
|
||||
module_exit(sysstats_exit);
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user