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mm, oom: keep oom_adj under or at upper limit when printing 

For oom_score_adj values in the range [942,999], the current
calculations will print 16 for oom_adj.  This patch simply limits the
output so output is inline with docs.

Signed-off-by: Charles Haithcock <chaithco@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Link: https://lkml.kernel.org/r/20201020165130.33927-1-chaithco@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Charles Haithcock 2020-11-01 17:07:56 -08:00 committed by Linus Torvalds
parent 6993d0fdbe
commit 66606567de
1 changed files with 2 additions and 0 deletions
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2
fs/proc/base.c
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@ -1049,6 +1049,8 @@ static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) /
OOM_SCORE_ADJ_MAX;
put_task_struct(task);
if (oom_adj > OOM_ADJUST_MAX)
oom_adj = OOM_ADJUST_MAX;
len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj);
return simple_read_from_buffer(buf, count, ppos, buffer, len);
}