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mm: improve __GFP_NORETRY comment based on implementation

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Explicitly state that __GFP_NORETRY will attempt direct reclaim and
memory compaction before returning NULL and that the oom killer is not
called in the current implementation of the page allocator.

[akpm@linux-foundation.org: s/has/have/]
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2015-09-08 15:00:31 -07:00 committed by Linus Torvalds
parent 998ef75ddb
commit 28c015d075
1 changed files with 4 additions and 1 deletions
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include/linux/gfp.h
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@ -63,7 +63,10 @@ struct vm_area_struct;
* but it is definitely preferable to use the flag rather than opencode endless
* loop around allocator.
*
* __GFP_NORETRY: The VM implementation must not retry indefinitely.
* __GFP_NORETRY: The VM implementation must not retry indefinitely and will
* return NULL when direct reclaim and memory compaction have failed to allow
* the allocation to succeed. The OOM killer is not called with the current
* implementation.
*
* __GFP_MOVABLE: Flag that this page will be movable by the page migration
* mechanism or reclaimed