linux-kernel - Re: [PATCH 2/2] mm: Document handle_mm

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Message-ID: <BANLkTikgxKNx1eyR1m6NpVA5Ykfduzq-Mw@mail.gmail.com>
Date:	Tue, 28 Jun 2011 10:02:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Gleb Natapov <gleb@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH 2/2] mm: Document handle_mm_fault()

On Tue, Jun 28, 2011 at 9:47 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> + * Note: if @flags has FAULT_FLAG_ALLOW_RETRY set then the mmap_sem
> + *       may be released if it failed to arquire the page_lock. If the
> + *       mmap_sem is released then it will return VM_FAULT_RETRY set.
> + *       This is to keep the time mmap_sem is held when the page_lock
> + *       is taken for IO.

So I know what that flag does, but I knew it without the comment.

WITH the comment, I'm just confused. "This is to keep the time
mmap_sem is held when the page_lock is taken for IO."

Sounds like a google translation from swahili. "keep the time" what?

Maybe "keep" -> "minimize"? Or just "This is to avoid holding mmap_sem
while waiting for IO"

                        Linus
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