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add MADV_FREE madvise command from linux v4.5

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allows the os to free the marked pages lazily on memory pressure.
expected to increase malloc performance.
new in linux commit 854e9ed09dedf0c19ac8640e91bcc74bc3f9e5c9
This commit is contained in:
Szabolcs Nagy 2016-03-19 13:37:37 +01:00 committed by Rich Felker
parent b10ca0f560
commit d578c74e67
1 changed files with 1 additions and 0 deletions
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include/sys/mman.h
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@ -62,6 +62,7 @@ extern "C" {
#define MADV_SEQUENTIAL 2 #define MADV_SEQUENTIAL 2
#define MADV_WILLNEED 3 #define MADV_WILLNEED 3
#define MADV_DONTNEED 4 #define MADV_DONTNEED 4
#define MADV_FREE 8
#define MADV_REMOVE 9 #define MADV_REMOVE 9
#define MADV_DONTFORK 10 #define MADV_DONTFORK 10
#define MADV_DOFORK 11 #define MADV_DOFORK 11