From: Andrew Morton <akpm@zip.com.au>
To: Robert Love <rml@tech9.net>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] low-latency zap_page_range()
Date: Thu, 29 Aug 2002 14:00:47 -0700 [thread overview]
Message-ID: <3D6E8B7F.8D5D20D8@zip.com.au> (raw)
In-Reply-To: <1030653602.939.2677.camel@phantasy>
Robert Love wrote:
>
> ...
> 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.
That's an interesting point. page_table_lock is one of those locks
which is occasionally held for ages, and frequently held for a short
time.
I suspect that yes, voluntarily popping the lock during the long holdtimes
will allow other CPUs to get on with stuff, and will provide efficiency
increases. (It's a pretty lame way of doing that though).
But I don't recall seeing nasty page_table_lock spintimes on
anyone's lockmeter reports, so we can leave it as-is for now.
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next prev parent reply other threads:[~2002-08-29 21:00 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
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 [this message]
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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