From: Andrew Morton <akpm@osdl.org>
To: Nikita Danilov <nikita@clusterfs.com>
Cc: linux-mm@kvack.org
Subject: Re: [PATCH]: VM 6/8 page_referenced(): move dirty
Date: Mon, 25 Apr 2005 21:00:16 -0700 [thread overview]
Message-ID: <20050425210016.6f8a47d1.akpm@osdl.org> (raw)
In-Reply-To: <16994.40677.105697.817303@gargle.gargle.HOWL>
Nikita Danilov <nikita@clusterfs.com> wrote:
>
> transfer dirtiness from pte to the struct page in page_referenced().
This will increase the amount of physical I/O which the machine performs.
If we're not really confident that we'll soon be able to reclaim a mmapped
page then we shouldn't bother writing it to disk, as it's quite likely that
userspace will redirty the page after we wrote it.
I can envision workloads (such as mmap 80% of memory and continuously dirty
it) which would end up performing continuous I/O with this patch.
IOW: I'm gonna drop this one like it's made of lead!
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next prev parent reply other threads:[~2005-04-26 4:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-17 17:37 Nikita Danilov
2005-04-26 4:00 ` Andrew Morton [this message]
2005-04-26 8:49 ` Nikita Danilov
2005-04-26 8:55 ` Andrew Morton
2005-04-26 9:36 ` Nikita Danilov
2005-04-26 10:05 ` Andrew Morton
2005-04-26 10:20 ` Nikita Danilov
2005-04-26 10:33 ` Andrew Morton
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