linux-kernel - Re: [PATCH] VM: Fix the gfp_mask in invalidate_complete

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Date:	Tue, 10 Oct 2006 10:43:30 +0100
From:	David Howells <dhowells@...hat.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Andrew Morton <akpm@...l.org>, Steve Dickson <SteveD@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VM: Fix the gfp_mask in invalidate_complete_page2 

Trond Myklebust <Trond.Myklebust@...app.com> wrote:

> -	if (PagePrivate(page) && !try_to_release_page(page, 0))
> +	if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))

This can't be the right way to fix things.  try_to_release_page() may fail
whatever GFP flags you give it.  If the page *must* be invalidated at this
point then you _must_ call the invalidatepage() op, not the releasepage() op.

What is currently there allows an instikill to take place on a page at this
point, but defers the kill on pages that are busy until all the pages have
been scanned once, thus giving I/O time to happen on busy pages whilst reaping
pages that can be made immediately available.

David
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