From: "Bulent Abali" <abali@us.ibm.com>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: Mike Galbraith <mikeg@wen-online.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Derek Glidden <dglidden@illusionary.com>,
lkml <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: Please test: workaround to help swapoff behaviour
Date: Fri, 8 Jun 2001 19:53:35 -0400 [thread overview]
Message-ID: <OF215A9F3A.3CFF9D00-ON85256A65.007FE32C@watson.ibm.com> (raw)
>> I looked at try_to_unuse in swapfile.c. I believe that the algorithm is
>> broken.
>> For each and every swap entry it is walking the entire process list
>> (for_each_task(p)). It is also grabbing a whole bunch of locks
>> for each swap entry. It might be worthwhile processing swap entries in
>> batches instead of one entry at a time.
>>
>> In any case, I think having this patch is worthwhile as a quick and
dirty
>> remedy.
>
>Bulent,
>
>Could you please check if 2.4.6-pre2+the schedule patch has better
>swapoff behaviour for you?
No problem. I will check it tomorrow. I don't think it can be any worse
than it is now. The patch looks correct in principle.
I believe it should go in to 2.4.6. But I will test it.
On small machines people don't notice it, but otherwise if you have few
GB of memory it really hurts. Shutdowns take forever since swapoff takes
forever.
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next reply other threads:[~2001-06-08 23:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-08 23:53 Bulent Abali [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-06-10 13:56 Bulent Abali
2001-06-09 20:32 Bulent Abali
2001-06-10 2:12 ` Eric W. Biederman
2001-06-10 5:54 ` Mikael Abrahamsson
2001-06-07 20:33 Bulent Abali
2001-06-07 19:40 ` Marcelo Tosatti
2001-06-08 21:11 ` Marcelo Tosatti
2001-06-07 17:10 Break 2.4 VM in five easy steps Marcelo Tosatti
2001-06-07 17:43 ` Please test: workaround to help swapoff behaviour Marcelo Tosatti
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