From: Rik van Riel <riel@conectiva.com.br>
To: Andrew Morton <akpm@zip.com.au>
Cc: William Lee Irwin III <wli@holomorphy.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: how not to write a search algorithm
Date: Sun, 4 Aug 2002 23:55:02 -0300 (BRT) [thread overview]
Message-ID: <Pine.LNX.4.44L.0208042354100.23404-100000@imladris.surriel.com> (raw)
In-Reply-To: <3D4DEA4B.4BAB65FB@zip.com.au>
On Sun, 4 Aug 2002, Andrew Morton wrote:
> Well I think we'll need a per-cpu-pages thing to amortise zone->lock
> contention anyway. So what we can do is:
>
> fill_up_the_per_cpu_buffer(GFP_KERNEL); /* disables preemption */
> spin_lock(lock);
> allocate(GFP_ATOMIC);
> spin_unlock(lock);
> preempt_enable();
>
> We also prevent interrupt-time allocations from
> stealing the final four pages from the per-cpu buffer.
>
> The allocation is guaranteed to succeed, yes? Can use
> it for ratnodes as well.
Yes, that would work.
One page for the process, one page table page, one ratcache page
and one pte chain page ... anything else ?
regards,
Rik
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next prev parent reply other threads:[~2002-08-05 2:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-04 8:35 Andrew Morton
2002-08-04 13:16 ` Rik van Riel
2002-08-04 20:00 ` Andrew Morton
2002-08-04 19:54 ` Rik van Riel
2002-08-04 20:38 ` William Lee Irwin III
2002-08-04 21:09 ` Andrew Morton
2002-08-04 22:02 ` William Lee Irwin III
2002-08-04 22:43 ` Andrew Morton
2002-08-04 22:47 ` William Lee Irwin III
2002-08-05 3:00 ` Andrew Morton
2002-08-05 2:55 ` Rik van Riel [this message]
2002-08-05 7:40 ` William Lee Irwin III
2002-08-05 8:44 ` Andrew Morton
2002-08-05 10:50 ` William Lee Irwin III
2002-08-04 22:45 ` Daniel Phillips
2002-08-04 23:03 ` Andrew Morton
2002-08-04 23:00 ` William Lee Irwin III
2002-08-04 23:02 ` Daniel Phillips
2002-08-04 23:21 ` Andrew Morton
2002-08-05 0:03 ` Daniel Phillips
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