diff options
| author |   Andrea Arcangeli <andrea@suse.de> | 2005-04-16 15:24:05 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:24:05 -0700 |
| commit | 79befd0c08c4766f8fa27e37ac2a70e40840a56a (patch) | |
| tree | d0600c289b1a54902e3b78eec0729dc7011569a3 | |
| parent | [PATCH] filemap_getpage can block when MAP_NONBLOCK specified (diff) | |
| download | linux-dev-79befd0c08c4766f8fa27e37ac2a70e40840a56a.tar.xz linux-dev-79befd0c08c4766f8fa27e37ac2a70e40840a56a.zip | |
[PATCH] oom-killer disable for iscsi/lvm2/multipath userland critical sections
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>
| -rw-r--r-- | fs/proc/base.c | 2 | ||||
| -rw-r--r-- | include/linux/mm.h | 3 | ||||
| -rw-r--r-- | mm/oom_kill.c | 2 |
3 files changed, 5 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index dad8ea4e00a0..39fd336cfdb9 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -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++; diff --git a/include/linux/mm.h b/include/linux/mm.h index 6a931374d6c4..85f7d1bea937 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -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 */ diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 9595a0f6c4b8..4bbb1cb10495 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -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; /* |