From: Robert Love <rml@tech9.net>
To: Andrew Morton <akpm@zip.com.au>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] low-latency zap_page_range()
Date: 29 Aug 2002 16:40:02 -0400 [thread overview]
Message-ID: <1030653602.939.2677.camel@phantasy> (raw)
In-Reply-To: <3D6E844C.4E756D10@zip.com.au>
On Thu, 2002-08-29 at 16:30, Andrew Morton wrote:
> However with your change, we'll only ever put 256 pages into the
> mmu_gather_t. Half of that thing's buffer is unused and the
> invalidation rate will be doubled during teardown of large
> address ranges.
Agreed. Go for it.
Hm, unless, since 507 vs 256 is not the end of the world and latency is
already low, we want to just make it always (FREE_PTE_NR*PAGE_SIZE)...
As long as the "cond_resched_lock()" is a preempt only thing, I also
agree with making ZAP_BLOCK_SIZE ~0 on !CONFIG_PREEMPT - unless we
wanted to unconditionally drop the locks and let preempt just do the
right thing and also reduce SMP lock contention in the SMP case.
Robert Love
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next prev parent reply other threads:[~2002-08-29 20:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-29 15:31 Robert Love
2002-08-29 20:30 ` Andrew Morton
2002-08-29 20:40 ` Robert Love [this message]
2002-08-29 20:46 ` Robert Love
2002-08-29 20:59 ` Andrew Morton
2002-08-29 21:38 ` William Lee Irwin III
2002-08-29 21:00 ` Andrew Morton
2002-08-29 21:12 ` Robert Love
2002-08-29 21:22 ` Andrew Morton
2002-08-29 21:46 ` Rik van Riel
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