From: "Alex Villacís Lasso" <avillaci@fiec.espol.edu.ec>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>,
Andrew Morton <akpm@linux-foundation.org>,
avillaci@ceibo.fiec.espol.edu.ec,
bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, linux-mm@kvack.org
Subject: Re: [Bugme-new] [Bug 31142] New: Large write to USB stick freezes unrelated tasks for a long time
Date: Tue, 22 Mar 2011 15:34:10 -0500 [thread overview]
Message-ID: <4D8907C2.7010304@fiec.espol.edu.ec> (raw)
In-Reply-To: <20110322150314.GC5698@random.random>
El 22/03/11 10:03, Andrea Arcangeli escribio:
>
> I asked yesterday by PM to Alex if the mouse pointer moves or not
> during the stalls (if it doesn't that may be a scheduler issue with
> the compaction irq disabled and lack of cond_resched) and to try
> aa.git. Upstream still misses several compaction improvements that we
> did over the last weeks and that I've in my queue and that are in -mm
> as well. So before making more changes, considering the stack traces
> looks very healthy now, I'd wait to be sure the hangs aren't already
> solved by any of the other scheduling/irq latency fixes. I guess they
> aren't going to help but it worth a try. Verifying if this happens
> with a more optimal filesystem like ext4 I think is also interesting,
> it may be something in udf internal locking that gets in the way of
> compaction.
>
> If we still have a problem with current aa.git and ext4, then I'd hope
> we can find some other more genuine bit to improve like the bits we've
> improved so far, but if there's nothing wrong and it gets unfixable,
> then my preference would be to either create a defrag mode that is in
> between "yes/no", or alternatively to be simpler and make the default
> between defrag yes|no configurable at build time and through a command
> line in grub, and hope that SLUB doesn't clashes on it too. The
> current "default" is optimal for several server environments where we
> know most of the allocations are long lived. So we want to still have
> an option to be as reliable as we are toady for those.
>
I have just tested aa.git as of today, with the USB stick formatted as FAT32. I could no longer reproduce the stalls. There was no need to format as ext4. No /proc workarounds required.
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next prev parent reply other threads:[~2011-03-22 20:35 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-31142-10286@https.bugzilla.kernel.org/>
2011-03-15 20:53 ` Andrew Morton
2011-03-15 22:53 ` Alex Villacís Lasso
2011-03-15 23:19 ` Andrew Morton
2011-03-16 15:25 ` Alex Villacís Lasso
2011-03-16 22:02 ` Andrew Morton
2011-03-17 21:27 ` Alex Villacís Lasso
2011-03-17 21:47 ` Andrew Morton
2011-03-17 22:11 ` Alex Villacís Lasso
2011-03-17 22:25 ` Andrew Morton
2011-03-18 11:13 ` Mel Gorman
2011-03-18 12:26 ` Andrea Arcangeli
2011-03-18 18:05 ` Alex Villacís Lasso
2011-03-19 13:46 ` Mel Gorman
2011-03-19 16:04 ` Alex Villacís Lasso
2011-03-19 23:51 ` Andrea Arcangeli
2011-03-21 9:41 ` Mel Gorman
2011-03-21 13:48 ` Andrea Arcangeli
2011-03-21 15:22 ` Alex Villacís Lasso
2011-03-21 15:36 ` Alex Villacís Lasso
2011-03-21 15:40 ` Andrea Arcangeli
2011-03-21 16:37 ` Mel Gorman
2011-03-21 17:05 ` Alex Villacís Lasso
2011-03-21 20:16 ` Andrea Arcangeli
2011-03-21 23:35 ` Alex Villacís Lasso
2011-03-22 11:20 ` Mel Gorman
2011-03-22 15:03 ` Andrea Arcangeli
2011-03-22 20:34 ` Alex Villacís Lasso [this message]
2011-03-22 21:40 ` Andrea Arcangeli
2011-03-23 0:37 ` Andrea Arcangeli
2011-03-23 16:51 ` Alex Villacís Lasso
2011-04-04 15:37 ` Alex Villacís Lasso
2011-04-08 19:09 ` Andrea Arcangeli
2011-04-08 20:06 ` Alex Villacís Lasso
2011-04-12 16:27 ` Alex Villacís Lasso
2011-04-14 17:25 ` Alex Villacís Lasso
2011-04-14 17:37 ` Andrea Arcangeli
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