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sys/mman.h: add MADV_COLD and MADV_PAGEOUT from linux v5.4

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These were mainly introduced so android can optimize the memory usage
of unused apps.

MADV_COLD hints that the memory range is currently not needed (unlike
with MADV_FREE the content is not garbage, it needs to be swapped):

  linux commit 9c276cc65a58faf98be8e56962745ec99ab87636
  mm: introduce MADV_COLD

MADV_PAGEOUT hints that the memory range is not needed for a long time
so it can be reclaimed immediately independently of memory pressure
(unlike with MADV_DONTNEED the content is not garbage):

  linux commit 1a4e58cce84ee88129d5d49c064bd2852b481357
  mm: introduce MADV_PAGEOUT
This commit is contained in:
Szabolcs Nagy 2019-12-22 10:26:20 +00:00 committed by Rich Felker
parent fa765ca54f
commit d95ead261e
1 changed files with 2 additions and 0 deletions
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2
include/sys/mman.h
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@ -92,6 +92,8 @@ extern "C" {
#define MADV_DODUMP 17
#define MADV_WIPEONFORK 18
#define MADV_KEEPONFORK 19
#define MADV_COLD 20
#define MADV_PAGEOUT 21
#define MADV_HWPOISON 100
#define MADV_SOFT_OFFLINE 101
#endif