From: "David S. Miller" <davem@redhat.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: torvalds@osdl.org, linux-arch@vger.kernel.org
Subject: Re: clear_user_highpage()
Date: Wed, 11 Aug 2004 18:01:22 -0700 [thread overview]
Message-ID: <20040811180122.428a9e61.davem@redhat.com> (raw)
In-Reply-To: <20040812004654.GX11200@holomorphy.com>
On Wed, 11 Aug 2004 17:46:54 -0700
William Lee Irwin III <wli@holomorphy.com> wrote:
> The scheduling latency aspect is due to the fact that many cpus have
> caching semantics that require extremely slow uncached accesss to
> prevent cache pollution, and that page zeroing is slow enough of an
> operation to noticeably stall rescheduling userspace.
This wouldn't be an issue on sparc64, as I've previously stated
an entire page can be zero'd out, cache bypassed on miss, in 4400
cycles even when the L2 cache misses for the whole page.
That would add less to rescheduling latency than that
obtained from simply taking a hardware interrupt.
next prev parent reply other threads:[~2004-08-12 1:02 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-11 23:15 clear_user_highpage() David S. Miller
2004-08-11 23:31 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-11 23:55 ` clear_user_highpage() David S. Miller
2004-08-12 0:03 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 1:18 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:11 ` clear_user_highpage() Andi Kleen
2004-08-12 9:23 ` clear_user_highpage() Martin Schwidefsky
2004-08-11 23:46 ` clear_user_highpage() Linus Torvalds
2004-08-11 23:53 ` clear_user_highpage() David S. Miller
2004-08-12 0:00 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:06 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 0:24 ` clear_user_highpage() David S. Miller
2004-08-12 0:23 ` clear_user_highpage() David S. Miller
2004-08-12 1:46 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:51 ` clear_user_highpage() David S. Miller
2004-08-16 1:58 ` clear_user_highpage() Paul Mackerras
2004-08-12 2:08 ` clear_user_highpage() Andi Kleen
2004-08-12 2:45 ` clear_user_highpage() David S. Miller
2004-08-12 9:09 ` clear_user_highpage() Andi Kleen
2004-08-12 19:50 ` clear_user_highpage() David S. Miller
2004-08-12 20:00 ` clear_user_highpage() Andi Kleen
2004-08-12 20:30 ` clear_user_highpage() David S. Miller
2004-08-12 21:34 ` clear_user_highpage() Matthew Wilcox
2004-08-13 8:16 ` clear_user_highpage() David Mosberger
2004-08-12 0:00 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 0:21 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:46 ` clear_user_highpage() William Lee Irwin III
2004-08-12 1:01 ` David S. Miller [this message]
2004-08-12 2:18 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:43 ` clear_user_highpage() David S. Miller
2004-08-12 4:19 ` clear_user_highpage() Linus Torvalds
2004-08-12 4:46 ` clear_user_highpage() William Lee Irwin III
2004-08-15 6:22 ` clear_user_highpage() Andrew Morton
2004-08-15 6:38 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:57 ` clear_user_highpage() David S. Miller
2004-08-12 3:20 ` clear_user_highpage() William Lee Irwin III
2004-08-13 21:41 ` clear_user_highpage() David S. Miller
2004-08-16 13:00 ` clear_user_highpage() David Mosberger
2004-08-22 19:51 ` clear_user_highpage() Linus Torvalds
2005-09-17 19:01 ` clear_user_highpage() Andi Kleen
2005-09-17 19:16 ` clear_user_highpage() Andi Kleen
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