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linux: Add MAP_DROPPABLE from Linux 6.11

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This request the page to be never written out to swap, it will be zeroed
under memory pressure (so kernel can just drop the page), it is inherited
by fork, it is not counted against @code{mlock} budget, and if there is
no enough memory to service a page faults there is no fatal error (so not
signal is sent).

Tested with build-many-glibcs.py.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Adhemerval Zanella
2024-10-08 15:45:26 -03:00
parent 86f06282cc
commit f6e849fd7c
3 changed files with 11 additions and 1 deletions
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sysdeps/unix/sysv/linux/bits/mman-linux.h
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@@ -43,6 +43,7 @@
#define MAP_PRIVATE 0x02 /* Changes are private. */
#define MAP_SHARED_VALIDATE 0x03 /* Share changes and validate
extension flags. */
#define MAP_DROPPABLE 0x08 /* Zero memory under memory pressure. */
#define MAP_TYPE 0x0f /* Mask for type of mapping. */
/* Other flags. */