From: "Stephen C. Tweedie" <sct@redhat.com>
To: masp0008@stud.uni-sb.de
Cc: linux-kernel@vger.rutgers.edu, linux-mm@kvack.org,
"David S. Miller" <davem@dm.cobaltmicro.com>,
Stephen Tweedie <sct@redhat.com>
Subject: Re: kernel_lock() profiling results
Date: Wed, 26 May 1999 17:34:38 +0100 (BST) [thread overview]
Message-ID: <14156.8862.155397.630098@dukat.scot.redhat.com> (raw)
In-Reply-To: <3748111C.3F040C1F@colorfullife.com>
Hi,
On Sun, 23 May 1999 16:30:52 +0200, Manfred Spraul
<manfreds@colorfullife.com> said:
> Shouldn't we change file_read_actor() [mm/filemap.c, the function which
> copies data from the page cache to user mode]:
> we could release the kernel lock if we copy more than 1024 bytes.
> (we currently do that only if the user mode memory is not paged in.)
ftp://ftp.uk.linux.org/pub/linux/sct/performance
contains a patch Dave Miller and I put together to drop the kernel lock
during a number of key user mode copies.
--Stephen
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next prev parent reply other threads:[~1999-05-26 16:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-05-23 14:30 kernel_lock() profiling results Manfred Spraul
1999-05-26 16:34 ` Stephen C. Tweedie [this message]
1999-05-26 17:41 ` Manfred Spraul
1999-05-26 19:22 ` Stephen C. Tweedie
1999-05-29 0:45 ` Andrea Arcangeli
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