linux-kernel - [mmotm][BUG] free is bigger than presnet Re: mmotm 2009-08-27-16-51 uploaded

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Date:	Tue, 1 Sep 2009 18:00:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [mmotm][BUG] free is bigger than presnet Re: mmotm 2009-08-27-16-51
 uploaded

On Thu, 27 Aug 2009 16:55:42 -0700
akpm@...ux-foundation.org wrote:

> The mm-of-the-moment snapshot 2009-08-27-16-51 has been uploaded to
> 
>    http://userweb.kernel.org/~akpm/mmotm/
> 
> and will soon be available at
> 
>    git://git.zen-sources.org/zen/mmotm.git
> 
> It contains the following patches against 2.6.31-rc7:
> 

I'm not digggin so much but /proc/meminfo corrupted.

[kamezawa@...extal cgroup]$ cat /proc/meminfo
MemTotal:       24421124 kB
MemFree:        38314388 kB

Wow ;)
On x86-64 8cpu box + 24G memory.
(config is NUMA but the system itself is not NUMA.)

At boot time and for a while, It seems to be no trouble.

I used this.

== malloc.c

#include <stdio.h>

#define MSIZE (1024 * 1024 * 8)

int main(int argc, char *argv[])
{
        char **c;
        long size;
        int array_size, i;

        size = atoi(argv[1]);
        size *= 1024 * 1024;

        array_size =  size/MSIZE + 1;
        c= malloc(sizeof(void *) * array_size);

        for (i = 0; i < array_size; i++) {
                c[i] = malloc(MSIZE);
                memset(c[i], 0, MSIZE);
        }
        while (1) {
                for (i = 0; i < array_size; i++) {
                        memset(c[i], 0, MSIZE);
                        sleep(2);
                }
                sleep(10);
        }
        return;
}
==
# malloc 23000
# malloc 1000
and run hackbench 20.

OOM Kill message says free exceeds present ;(
==
Sep  1 18:01:17 localhost kernel: [ 3012.503440] active_anon:5461242 inactive_anon:473226 isolated_anon:384
Sep  1 18:01:17 localhost kernel: [ 3012.503440]  active_file:133 inactive_file:664 isolated_file:0
Sep  1 18:01:17 localhost kernel: [ 3012.503440]  unevictable:0 dirty:0 writeback:73 unstable:0 buffer:283
Sep  1 18:01:17 localhost kernel: [ 3012.503440]  free:9454041 slab_reclaimable:5144 slab_unreclaimable:10564
Sep  1 18:01:17 localhost kernel: [ 3012.503440]  mapped:7019 shmem:0 pagetables:22572 bounce:0
Sep  1 18:01:17 localhost kernel: [ 3012.503440] Node 0 DMA free:15788kB min:12kB low:12kB high:16kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15016kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Sep  1 18:01:17 localhost kernel: [ 3012.503440] lowmem_reserve[]: 0 2951 23909 23909
Sep  1 18:01:17 localhost kernel: [ 3012.503440] Node 0 DMA32 free:11729908kB min:2440kB low:3048kB high:3660kB active_anon:1866292kB inactive_anon:466548kB active_file:140kB inactive_file:1588kB unevictable:0kB isolated(anon):256kB isolated(file):0kB present:3022624kB mlocked:0kB dirty:0kB writeback:292kB mapped:8kB shmem:0kB slab_reclaimable:2724kB slab_unreclaimable:10124kB kernel_stack:4504kB pagetables:21536kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:227 all_unreclaimable? no
Sep  1 18:01:17 localhost kernel: [ 3012.503440] lowmem_reserve[]: 0 0 20958 20958
Sep  1 18:01:17 localhost kernel: [ 3012.503440] Node 0 Normal free:26071392kB min:17340kB low:21672kB high:26008kB active_anon:19978676kB inactive_anon:1426356kB active_file:392kB inactive_file:1068kB unevictable:0kB isolated(anon):1280kB isolated(file):0kB present:21460992kB mlocked:0kB dirty:0kB writeback:0kB mapped:28068kB shmem:0kB slab_reclaimable:17852kB slab_unreclaimable:32132kB kernel_stack:3672kB pagetables:68752kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:3840 all_unreclaimable? no

==

I'll dig more but does anyone have hints ?


Thanks,
-Kame

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