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Memory pages are not munmapped, instead we just madvise()

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Memory unmapping causes slow address space fragmentation, leading in
extreme cases to failing to allocate pages at all. Removing this problem
by keeping all the pages allocated to us, yet calling madvise() to let
kernel dispose of them.

This adds a little complexity and overhead as we have to keep the
pointers to the free pages, therefore to hold e.g. 1 GB of 4K pages with
8B pointers, we have to store 2 MB of data.
This commit is contained in:
Maria Matejka
2022-11-01 18:40:56 +01:00
parent 37b6444137
commit 9d03c3f56c
2 changed files with 45 additions and 6 deletions
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sysdep/cf/linux.h
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@@ -20,6 +20,7 @@
#define CONFIG_RESTRICTED_PRIVILEGES
#define CONFIG_INCLUDE_SYSPRIV_H "sysdep/linux/syspriv.h"
#define CONFIG_MADV_DONTNEED_TO_FREE
#ifndef AF_MPLS
#define AF_MPLS 28