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c/r: procfs: add start_data, end_data, start_brk members to /proc/$pid/stat v4

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The mm->start_code/end_code, mm->start_data/end_data, mm->start_brk are
involved into calculation of program text/data segment sizes (which might
be seen in /proc/<pid>/statm) and into brk() call final address.

For restore we need to know all these values.  While
mm->start_code/end_code already present in /proc/$pid/stat, the rest
members are not, so this patch brings them in.

The restore procedure of these members is addressed in another patch using
prctl().

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cyrill Gorcunov 2012-01-12 17:20:53 -08:00 committed by Linus Torvalds
parent 067bce1a06
commit b3f7f573a2
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/filesystems/proc.txt
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@ -307,6 +307,9 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7)
blkio_ticks time spent waiting for block IO blkio_ticks time spent waiting for block IO
gtime guest time of the task in jiffies gtime guest time of the task in jiffies
cgtime guest time of the task children in jiffies cgtime guest time of the task children in jiffies
start_data address above which program data+bss is placed
end_data address below which program data+bss is placed
start_brk address above which program heap can be expanded with brk()
.............................................................................. ..............................................................................
The /proc/PID/maps file containing the currently mapped memory regions and The /proc/PID/maps file containing the currently mapped memory regions and

7
fs/proc/array.c
View File

@ -464,7 +464,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \ seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
pid_nr_ns(pid, ns), pid_nr_ns(pid, ns),
tcomm, tcomm,
state, state,
@ -511,7 +511,10 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
task->policy, task->policy,
(unsigned long long)delayacct_blkio_ticks(task), (unsigned long long)delayacct_blkio_ticks(task),
cputime_to_clock_t(gtime), cputime_to_clock_t(gtime),
cputime_to_clock_t(cgtime)); cputime_to_clock_t(cgtime),
(mm && permitted) ? mm->start_data : 0,
(mm && permitted) ? mm->end_data : 0,
(mm && permitted) ? mm->start_brk : 0);
if (mm) if (mm)
mmput(mm); mmput(mm);
return 0; return 0;