From: Randolph Chung <randolph@tausq.org>
To: Carlos O'Donell <carlos@baldric.uwo.ca>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Improving performance of munmap
Date: Thu, 7 Oct 2004 21:16:57 -0700 [thread overview]
Message-ID: <20041008041657.GG14151@tausq.org> (raw)
In-Reply-To: <20041008020343.GN24430@baldric.uwo.ca>
> Is munmap() speed really a big issue? Does userland see the benefits of
> a faster flush_tlb_mm()?
actually i was wrong, the problem is not with flush_tlb_mm(), but with
flush_user_{dcache,icache}_range.
> Perhaps if you call dlclose() *a lot* you might notice.
>
> Or if you create and destroy threads really quickly.
>
> Aside from that, who else in userspace is a big munmap caller?
lots of apps use mmap a lot..... but even if they don't, 0.9 seconds is
a very long time to make somebody wait.
i made some changes to the flush_user_{dcache,icache}_range
implementation and it seems to be better now. will post the patch
tomorrow after some cleanups.
randolph
--
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/
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next prev parent reply other threads:[~2004-10-08 4:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-07 23:02 [parisc-linux] Improving performance of munmap Randolph Chung
2004-10-08 2:03 ` Carlos O'Donell
2004-10-08 4:16 ` Randolph Chung [this message]
2004-10-08 16:59 ` Randolph Chung
2004-10-08 17:05 ` Randolph Chung
2004-10-08 17:35 ` Grant Grundler
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