From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Andrew Morton <akpm@zip.com.au>,
Linus Torvalds <torvalds@transmeta.com>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.4.10-pre11
Date: Tue, 18 Sep 2001 16:18:34 -0300 (BRT) [thread overview]
Message-ID: <Pine.LNX.4.21.0109181508080.7836-100000@freak.distro.conectiva> (raw)
In-Reply-To: <Pine.LNX.4.21.0109181254200.7152-100000@freak.distro.conectiva>
On Tue, 18 Sep 2001, Marcelo Tosatti wrote:
>
>
> On Tue, 18 Sep 2001, Andrea Arcangeli wrote:
>
> > On Tue, Sep 18, 2001 at 02:02:37AM -0300, Marcelo Tosatti wrote:
> > > Try to run several memory hungry threads (thus hiding more pages).
> >
> > I did that indeed, not sure why I didn't reproduced (I guess the hogs
> > were sligthly different). (and of course they were killed but only after
> > the box was truly oom)
>
> Easy reproducible way:
>
> Boot with 64M, start 4 setiathome processes, then start mtest (from
> memtest suite) with a lot of threads (I'm using 40 readers and 4 writers
> in this case, and a 100MB heap)
>
> [root@matrix memtest-0.0.4]# ./mtest -m 100 -r 40 -w 4
> Starting test run with 100 megabyte heap.
> Setting up 25600 4096kB pages for test...
> done.
> Child 00 started with pid 00935, readonly
> Child 01 started with pid 00936, readonly
> Child 02 started with pid 00937, readonly
> Child 03 started with pid 00938, readonly
> Child 04 started with pid 00939, readonly
>
>
> Sep 18 14:28:31 matrix kernel: __alloc_pages: 0-order allocation failed
> (gfp=0x1d2/0) from c012c3be
> Sep 18 14:28:31 matrix kernel: VM: killing process setiathome
Andrea,
I still can reproduce the alloc pages failures with the following patch.
It should remove the "hidden pages" problem WRT ZONES. That is, a lot of
threads can still hide pages from each other independantly of the zone
hiding problem.
--- linux.orig/mm/vmscan.c Tue Sep 18 15:43:14 2001
+++ linux/mm/vmscan.c Tue Sep 18 16:37:52 2001
@@ -361,13 +361,19 @@
}
deactivate_page_nolock(page);
+
list_del(entry);
- list_add_tail(entry, &inactive_local_lru);
- if (__builtin_expect(!memclass(page->zone, classzone), 0))
+ if (__builtin_expect(!memclass(page->zone, classzone),
0)) {
+ list_add_tail(entry, &inactive_list);
+ __max_scan--;
continue;
+ }
__max_scan--;
+
+ list_add_tail(entry, &inactive_local_lru);
+
/* Racy check to avoid trylocking when not worthwhile */
if (!page->buffers && page_count(page) != 1) {
next prev parent reply other threads:[~2001-09-18 20:42 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-18 0:08 Linux 2.4.10-pre11 Linus Torvalds
2001-09-17 23:17 ` Marcelo Tosatti
2001-09-18 1:08 ` Marcelo Tosatti
2001-09-18 3:37 ` Andrea Arcangeli
2001-09-18 2:25 ` Marcelo Tosatti
2001-09-18 3:58 ` Andrea Arcangeli
2001-09-18 2:53 ` Marcelo Tosatti
2001-09-18 4:54 ` Andrea Arcangeli
2001-09-18 3:33 ` Marcelo Tosatti
2001-09-18 5:06 ` Andrea Arcangeli
2001-09-18 3:55 ` Marcelo Tosatti
2001-09-18 5:32 ` Andrea Arcangeli
2001-09-18 4:14 ` Marcelo Tosatti
2001-09-18 5:59 ` Andrea Arcangeli
2001-09-18 5:00 ` Marcelo Tosatti
[not found] ` <20010917211834.A31693@redhat.com>
[not found] ` <20010918035055.J698@athlon.random>
2001-09-18 2:02 ` Andrea Arcangeli
[not found] ` <20010917221653.B31693@redhat.com>
2001-09-18 2:27 ` Linus Torvalds
2001-09-18 3:14 ` Alan Cox
2001-09-18 3:26 ` Andrea Arcangeli
[not found] ` <20010918052201.N698@athlon.random>
2001-09-18 4:01 ` Benjamin LaHaise
2001-09-18 4:39 ` Andrea Arcangeli
2001-09-18 5:04 ` Alan Cox
2001-09-18 5:09 ` Andrea Arcangeli
2001-09-18 5:22 ` Benjamin LaHaise
2001-09-18 5:48 ` Andrea Arcangeli
2001-09-18 5:48 ` Andrew Morton
2001-09-18 6:11 ` Andrea Arcangeli
2001-09-18 5:02 ` Marcelo Tosatti
2001-09-18 6:40 ` Andrea Arcangeli
2001-09-18 16:06 ` Marcelo Tosatti
2001-09-18 19:18 ` Marcelo Tosatti [this message]
2001-09-18 21:05 ` Andrea Arcangeli
2001-09-19 13:57 ` Rik van Riel
2001-09-18 10:58 ` Martin Dalecki
2001-09-18 9:31 ` Alexander Viro
2001-09-18 9:39 ` Andrea Arcangeli
2001-09-18 9:44 ` Alexander Viro
2001-09-18 9:57 ` Andrea Arcangeli
2001-09-18 10:02 ` Alexander Viro
2001-09-18 10:17 ` Andrea Arcangeli
2001-09-18 10:28 ` Alexander Viro
2001-09-18 10:35 ` Andrea Arcangeli
2001-09-18 10:52 ` Alexander Viro
2001-09-18 11:05 ` Helge Hafting
2001-09-18 12:40 ` Andrea Arcangeli
2001-09-18 17:02 ` Linus Torvalds
2001-09-18 16:45 ` Linus Torvalds
2001-09-18 18:19 ` Alexander Viro
2001-09-18 18:27 ` Linus Torvalds
2001-09-18 19:14 ` Andreas Dilger
2001-09-18 19:41 ` Alexander Viro
2001-09-18 20:33 ` Richard Gooch
2001-09-18 20:53 ` Alexander Viro
2001-09-18 21:06 ` Richard Gooch
2001-09-18 21:27 ` Alexander Viro
2001-09-18 19:29 ` Benjamin LaHaise
2001-09-18 20:17 ` Stephan von Krawczynski
2001-09-18 20:33 ` Alan Cox
2001-09-19 13:42 ` Rik van Riel
2001-09-19 14:27 ` Alexander Viro
2001-09-19 2:59 ` Michael Peddemors
2001-09-19 16:11 ` Alexander Viro
2001-09-19 18:25 ` Andrea Arcangeli
2001-09-19 19:21 ` Alexander Viro
2001-09-19 20:55 ` Andrea Arcangeli
2001-09-19 21:17 ` Alexander Viro
2001-09-19 23:01 ` Andrea Arcangeli
2001-09-19 23:03 ` Andrea Arcangeli
2001-09-19 23:30 ` Alexander Viro
2001-09-19 23:40 ` Andrea Arcangeli
2001-09-20 13:56 ` Alexander Viro
2001-09-20 14:38 ` Chris Mason
2001-09-20 14:50 ` Alexander Viro
2001-09-20 15:44 ` Chris Mason
2001-09-20 16:43 ` Alexander Viro
2001-09-20 20:54 ` [PATCH] fs/block_dev.c cleanup Alexander Viro
2001-09-19 22:15 ` Linux 2.4.10-pre11 Richard Gooch
2001-09-20 2:34 ` Andrea Arcangeli
2001-09-20 10:52 ` Alexander Viro
2001-09-20 18:18 ` Andrea Arcangeli
2001-09-20 18:33 ` Alexander Viro
2001-09-20 18:59 ` Andrea Arcangeli
2001-09-20 20:41 ` Alexander Viro
2001-09-20 21:18 ` Andrea Arcangeli
2001-09-20 21:40 ` Alexander Viro
2001-09-20 22:13 ` Andrea Arcangeli
2001-09-20 22:20 ` Alexander Viro
2001-09-20 22:31 ` Andrea Arcangeli
2001-09-20 22:44 ` Alexander Viro
2001-09-20 23:03 ` Andrea Arcangeli
2001-09-20 23:11 ` Alexander Viro
2001-09-21 1:50 ` Alexander Viro
2001-09-21 2:42 ` Andrea Arcangeli
2001-09-21 3:47 ` Andrea Arcangeli
2001-09-21 4:00 ` Alexander Viro
2001-09-21 4:06 ` Andrea Arcangeli
2001-09-21 4:06 ` Andrea Arcangeli
2001-09-21 4:46 ` Andrea Arcangeli
2001-09-21 7:09 ` Andrea Arcangeli
2001-09-19 20:41 ` Richard Gooch
2001-09-19 13:38 ` Rik van Riel
2001-09-19 16:35 ` Andrea Arcangeli
2001-09-18 3:18 Ed Tomlinson
2001-09-18 2:31 ` Magnus Naeslund(f)
2001-09-18 2:49 ` David B. Stevens
2001-09-18 3:38 ` Ed Tomlinson
2001-09-18 3:15 ` Alan Cox
2001-09-18 4:41 ` H. Peter Anvin
2001-09-18 6:14 Alexei Podtelezhnikov
2001-09-18 13:51 ` Rik van Riel
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