From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Nick Piggin <piggin@cyberone.com.au>, Andrew Morton <akpm@osdl.org>
Cc: linux-mm@kvack.org
Subject: Re: [PATCH] extend usage of lightweight mm counter operations
Date: Sat, 11 Feb 2006 00:39:44 -0600 [thread overview]
Message-ID: <20060211063944.GA2908@dmt.cnet> (raw)
In-Reply-To: <20060211054922.GA3484@dmt.cnet>
Err, parts of this are unsafe.
On Fri, Feb 10, 2006 at 11:49:22PM -0600, Marcelo Tosatti wrote:
>
> Extend usage of Nick's lightweight mm counter operations to:
>
> - nr_dirty: in __set_page_dirty_nobuffers and __set_page_dirty_buffers,
> where interrupts are disabled due to acquision of mapping->tree_lock.
These are good.
> - nr_page_table_pages: which is never accessed from interrupt context.
>
> - pgfault/pgmajfault: which are never accessed from interrupt context.
These are buggy due to preemption. Shall a three underscore variant
be created to disable/enable preemption, or what?
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prev parent reply other threads:[~2006-02-11 6:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-11 5:49 [PATCH] extend usage of lightweight mm counter operations Marcelo Tosatti
2006-02-11 6:39 ` Marcelo Tosatti [this message]
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