From: Szabolcs Nagy <nsz@port70.net>
Date: Sat, 19 Mar 2016 12:37:37 +0000 (+0100)
Subject: add MADV_FREE madvise command from linux v4.5
X-Git-Tag: v1.1.15~75
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d578c74e677c9c29bfa0b5eec1f21506b9c05558;p=musl

add MADV_FREE madvise command from linux v4.5

allows the os to free the marked pages lazily on memory pressure.
expected to increase malloc performance.
new in linux commit 854e9ed09dedf0c19ac8640e91bcc74bc3f9e5c9
---

diff --git a/include/sys/mman.h b/include/sys/mman.h
index 596a03a7..8a5149c9 100644
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -62,6 +62,7 @@ extern "C" {
 #define MADV_SEQUENTIAL  2
 #define MADV_WILLNEED    3
 #define MADV_DONTNEED    4
+#define MADV_FREE        8
 #define MADV_REMOVE      9
 #define MADV_DONTFORK    10
 #define MADV_DOFORK      11