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ANDROID: fs: Add vendor hooks for ep_create_wakeup_source & timerfd_create

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timerfd doesn't create any wakelocks, but eventpoll can.  When it does,
it names them after the underlying file descriptor, and since all
timerfd file descriptors are named "[timerfd]" (which saves memory on
systems like desktops with potentially many timerfd instances), all
wakesources created as a result of using the eventpoll-on-timerfd idiom
are called... "[timerfd]".

However, it becomes impossible to tell which "[timerfd]" wakesource is
affliated with which process and hence troubleshooting is difficult.

Adding vendor hooks to allow vendor to assign appropriate names to
timerfd descriptors and eventoll wakesource.

Bug: 155142106

Signed-off-by: Manish Varma <varmam@google.com>
Change-Id: I330a42ab48bed4b26d5eb2f636925c66061165ec
This commit is contained in:
Manish Varma 2021-03-15 21:40:24 -07:00
parent 434df9f35d
commit 0ff110fbb3
4 changed files with 42 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/android/vendor_hooks.c
View File

@ -26,6 +26,7 @@
#include <trace/hooks/gic_v3.h>
#include <trace/hooks/epoch.h>
#include <trace/hooks/cpufreq.h>
#include <trace/hooks/fs.h>
#include <trace/hooks/mm.h>
#include <trace/hooks/preemptirq.h>
#include <trace/hooks/ftrace_dump.h>
@ -220,3 +221,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_typec_tcpci_chk_contaminant);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_typec_tcpci_get_vbus);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_account_task_time);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gpio_block_read);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ep_create_wakeup_source);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_timerfd_create);

11
fs/eventpoll.c
View File

@ -40,6 +40,8 @@
#include <linux/rculist.h>
#include <net/busy_poll.h>
#include <trace/hooks/fs.h>
/*
* LOCKING:
* There are three level of locking required by epoll :
@ -1451,15 +1453,20 @@ static int ep_create_wakeup_source(struct epitem *epi)
{
struct name_snapshot n;
struct wakeup_source *ws;
char ws_name[64];
strlcpy(ws_name, "eventpoll", sizeof(ws_name));
trace_android_vh_ep_create_wakeup_source(ws_name, sizeof(ws_name));
if (!epi->ep->ws) {
epi->ep->ws = wakeup_source_register(NULL, "eventpoll");
epi->ep->ws = wakeup_source_register(NULL, ws_name);
if (!epi->ep->ws)
return -ENOMEM;
}
take_dentry_name_snapshot(&n, epi->ffd.file->f_path.dentry);
ws = wakeup_source_register(NULL, n.name.name);
strlcpy(ws_name, n.name.name, sizeof(ws_name));
trace_android_vh_ep_create_wakeup_source(ws_name, sizeof(ws_name));
ws = wakeup_source_register(NULL, ws_name);
release_dentry_name_snapshot(&n);
if (!ws)

9
fs/timerfd.c
View File

@ -28,6 +28,8 @@
#include <linux/rcupdate.h>
#include <linux/time_namespace.h>
#include <trace/hooks/fs.h>
struct timerfd_ctx {
union {
struct hrtimer tmr;
@ -391,6 +393,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
{
int ufd;
struct timerfd_ctx *ctx;
char file_name_buf[32];
/* Check the TFD_* constants for consistency. */
BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
@ -427,7 +430,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
ctx->moffs = ktime_mono_to_real(0);
ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx,
strlcpy(file_name_buf, "[timerfd]", sizeof(file_name_buf));
trace_android_vh_timerfd_create(file_name_buf, sizeof(file_name_buf));
ufd = anon_inode_getfd(file_name_buf, &timerfd_fops, ctx,
O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS));
if (ufd < 0)
kfree(ctx);
@ -435,7 +440,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
return ufd;
}
static int do_timerfd_settime(int ufd, int flags,
static int do_timerfd_settime(int ufd, int flags,
const struct itimerspec64 *new,
struct itimerspec64 *old)
{

23
include/trace/hooks/fs.h Normal file
View File

@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM fs
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_FS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_FS_H
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
DECLARE_HOOK(android_vh_ep_create_wakeup_source,
TP_PROTO(char *name, int len),
TP_ARGS(name, len));
DECLARE_HOOK(android_vh_timerfd_create,
TP_PROTO(char *name, int len),
TP_ARGS(name, len));
#endif /* _TRACE_HOOK_FS_H */
/* This part must be outside protection */
#include <trace/define_trace.h>