From: Andrew Morton <akpm@zip.com.au>
To: Hanna Linder <hannal@us.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [CFT] delayed allocation and multipage I/O patches for 2.5.6.
Date: Mon, 18 Mar 2002 12:49:44 -0800 [thread overview]
Message-ID: <3C9652E8.67560587@zip.com.au> (raw)
In-Reply-To: <3C964AA3.4B85EA0B@zip.com.au> <15780000.1016482936@w-hlinder.des>
Hanna Linder wrote:
>
> --On Monday, March 18, 2002 12:14:27 -0800 Andrew Morton <akpm@zip.com.au> wrote:
>
> > One other possible explanation is to do with radix-tree pagecache.
> > It has to allocate memory to add nodes to the tree. When these
> > allocations start failing due to out-of-memory, the VM will keep
> > on calling swap_out() a trillion times without noticing that it
> > didn't work out. But if this happened, yo would have seen a huge
> > number of "0-order allocation failed" messages.
>
> Yes, I did see a huge number of those messages.
OK. Probably it would have eventually recovered, because there
would have been *some* I/O queued up somewhere. Of course, it
would recover a damn sight faster if I hadn't added those
printk's in the page allocator :)
> It also died
> on 2.5.6 clean though. I chalked it up to 2.5 instability.
mm. 2.5.6 is stable in my testing. PIIX4 IDE and aic7xxx SCSI.
So maybe a driver problem, maybe a highmem problem?
> Will test again when things calm down. Any chance you will
> backport to 2.4?
I don't really plan to do that. There's still quite a lot more stuff
needs doing, and it'll end up a huuuuge patch. Plus a fair bit of
the value isn't there, because 2.4 doesn't have BIOs.
-
next prev parent reply other threads:[~2002-03-18 20:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-12 6:00 [CFT] delayed allocation and multipage I/O patches for 2.5.6 Andrew Morton
2002-03-12 11:18 ` Daniel Phillips
2002-03-12 20:29 ` Andrew Morton
2002-03-12 20:40 ` Daniel Phillips
2002-03-12 11:39 ` Daniel Phillips
2002-03-12 21:00 ` Andrew Morton
2002-03-13 11:58 ` Daniel Phillips
2002-03-13 19:50 ` Andrew Morton
2002-03-13 21:51 ` Mike Fedyk
2002-03-14 11:59 ` Daniel Phillips
2002-03-13 0:42 ` David Woodhouse
2002-03-18 19:16 ` Hanna Linder
2002-03-18 20:14 ` Andrew Morton
2002-03-18 20:22 ` Hanna Linder
2002-03-18 20:49 ` Andrew Morton [this message]
2002-03-19 0:41 rwhron
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