diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-03-31 21:51:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-03-31 21:51:54 -0800 |
| commit | 56d93842e4840f371cb9acc8e5a628496b615a96 (patch) | |
| tree | 84aa2bab1dc46823c9d913b9872d52e627da3b44 /Documentation/sysctl | |
| parent | bc5c1743cddcca31200f4a201fe9a70a87737ef8 (diff) | |
[PATCH] Replace MAX_MAP_COUNT with /proc/sys/vm/max_map_count
From: David Mosberger <davidm@napali.hpl.hp.com>
Below is a warmed up version of a patch originally done by Werner Almesberger
(see http://tinyurl.com/25zra) to replace the MAX_MAP_COUNT limit with a
sysctl variable. I thought this had gone into the tree a long time ago but
alas it has not and as luck would have it, the hard limit bit someone today
once again with a large app on a large machine.
Here is a small test app:
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/vm.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 05f627955391..fc3e413c3721 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -22,6 +22,7 @@ Currently, these files are in /proc/sys/vm: - dirty_background_ratio - dirty_expire_centisecs - dirty_writeback_centisecs +- max_map_count - min_free_kbytes ============================================================== @@ -77,6 +78,21 @@ for swap because we only cluster swap data in 32-page groups. ============================================================== +max_map_count: + +This file contains the maximum number of memory map areas a process +may have. Memory map areas are used as a side-effect of calling +malloc, directly by mmap and mprotect, and also when loading shared +libraries. + +While most applications need less than a thousand maps, certain +programs, particularly malloc debuggers, may consume lots of them, +e.g., up to one or two maps per allocation. + +The default value is 65536. + +============================================================== + min_free_kbytes: This is used to force the Linux VM to keep a minimum number |