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mm, oom: reintroduce /proc/pid/oom_adj

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This is mostly a revert of 01dc52ebdf ("oom: remove deprecated oom_adj")
from Davidlohr Bueso.

It reintroduces /proc/pid/oom_adj for backwards compatibility with earlier
kernels.  It simply scales the value linearly when /proc/pid/oom_score_adj
is written.

The major difference is that its scheduled removal is no longer included
in Documentation/feature-removal-schedule.txt.  We do warn users with a
single printk, though, to suggest the more powerful and supported
/proc/pid/oom_score_adj interface.

Reported-by: Artem S. Tashkinov <t.artem@lycos.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2012-11-12 17:53:04 -08:00 • committed by Linus Torvalds
parent f4bcd79c88
commit fa0cbbf145
3 changed files with 130 additions and 4 deletions
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9
include/uapi/linux/oom.h
View file

@ -8,4 +8,13 @@
#define OOM_SCORE_ADJ_MIN (-1000)
#define OOM_SCORE_ADJ_MAX 1000
/*
* /proc/<pid>/oom_adj set to -17 protects from the oom killer for legacy
* purposes.
*/
#define OOM_DISABLE (-17)
/* inclusive */
#define OOM_ADJUST_MIN (-16)
#define OOM_ADJUST_MAX 15
#endif /* _UAPI__INCLUDE_LINUX_OOM_H */