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[PATCH] oom-killer disable for iscsi/lvm2/multipath userland critical sections

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iscsi/lvm2/multipath needs guaranteed protection from the oom-killer, so
make the magical value of -17 in /proc/<pid>/oom_adj defeat the oom-killer
altogether.

(akpm: we still need to document oom_adj and friends in
Documentation/filesystems/proc.txt!)

Signed-off-by: Andrea Arcangeli <andrea@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrea Arcangeli 2005-04-16 15:24:05 -07:00 committed by Linus Torvalds
parent d345734267
commit 79befd0c08
3 changed files with 5 additions and 2 deletions
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2
fs/proc/base.c
View File

@ -751,7 +751,7 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
if (copy_from_user(buffer, buf, count))
return -EFAULT;
oom_adjust = simple_strtol(buffer, &end, 0);
if (oom_adjust < -16 || oom_adjust > 15)
if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
return -EINVAL;
if (*end == '\n')
end++;

3
include/linux/mm.h
View File

@ -857,5 +857,8 @@ int in_gate_area_no_task(unsigned long addr);
#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
#endif /* __HAVE_ARCH_GATE_AREA */
/* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
#define OOM_DISABLE -17
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */

2
mm/oom_kill.c
View File

@ -145,7 +145,7 @@ static struct task_struct * select_bad_process(void)
do_posix_clock_monotonic_gettime(&uptime);
do_each_thread(g, p)
/* skip the init task with pid == 1 */
if (p->pid > 1) {
if (p->pid > 1 && p->oomkilladj != OOM_DISABLE) {
unsigned long points;
/*