From f6e849fd7ce2a8954022bd23b94703975b3db0d1 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 8 Oct 2024 15:45:26 -0300 Subject: linux: Add MAP_DROPPABLE from Linux 6.11 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 --- sysdeps/unix/sysv/linux/bits/mman-linux.h | 1 + 1 file changed, 1 insertion(+) (limited to 'sysdeps/unix/sysv/linux/bits') diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h index 522333c..161a885 100644 --- a/sysdeps/unix/sysv/linux/bits/mman-linux.h +++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h @@ -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. */ -- cgit v1.1