>From 2dc8c67fdcf54fccb83b6b4f3d9ac6ea0c3f0eea Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Sun, 22 Dec 2019 10:26:20 +0000 Subject: [PATCH 1/6] sys/mman.h: add MADV_COLD and MADV_PAGEOUT from linux v5.4 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 --- include/sys/mman.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/sys/mman.h b/include/sys/mman.h index d0761b18..3bade727 100644 --- a/include/sys/mman.h +++ b/include/sys/mman.h @@ -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 -- 2.23.0