From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@gmail.com>, Minchan Kim <minchan@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Hugh Dickins <hughd@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
kosaki.motohiro@jp.fujitsu.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC] propagate gfp_t to page table alloc functions
Date: Wed, 25 Apr 2012 08:49:06 +0900 [thread overview]
Message-ID: <4F973BF2.4080406@jp.fujitsu.com> (raw)
In-Reply-To: <20120424143015.99fd8d4a.akpm@linux-foundation.org>
(2012/04/25 6:30), Andrew Morton wrote:
> On Tue, 24 Apr 2012 17:48:29 +1000
> Nick Piggin <npiggin@gmail.com> wrote:
>
>>> Hmm, there are several places to use GFP_NOIO and GFP_NOFS even, GFP_ATOMIC.
>>> I believe it's not trivial now.
>>
>> They're all buggy then. Unfortunately not through any real fault of their own.
>
> There are gruesome problems in block/blk-throttle.c (thread "mempool,
> percpu, blkcg: fix percpu stat allocation and remove stats_lock"). It
> wants to do an alloc_percpu()->vmalloc() from the IO submission path,
> under GFP_NOIO.
>
> Changing vmalloc() to take a gfp_t does make lots of sense, although I
> worry a bit about making vmalloc() easier to use!
>
> I do wonder whether the whole scheme of explicitly passing a gfp_t was
> a mistake and that the allocation context should be part of the task
> context. ie: pass the allocation mode via *current.
yes...that's very interesting.
Regards,
-Kame
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next prev parent reply other threads:[~2012-04-24 23:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 8:55 [RFC] propagate gfp_t to page table alloc functions Minchan Kim
2012-04-24 5:16 ` KAMEZAWA Hiroyuki
2012-04-24 5:35 ` Minchan Kim
2012-04-24 6:13 ` Nick Piggin
2012-04-24 7:19 ` Minchan Kim
2012-04-24 7:48 ` Nick Piggin
2012-04-24 8:01 ` Minchan Kim
2012-04-24 8:05 ` Nick Piggin
2012-04-24 21:30 ` Andrew Morton
2012-04-24 23:49 ` KAMEZAWA Hiroyuki [this message]
2012-04-24 23:55 ` KOSAKI Motohiro
2012-04-25 0:05 ` KAMEZAWA Hiroyuki
2012-04-25 0:25 ` Andrew Morton
2012-04-26 0:05 ` KAMEZAWA Hiroyuki
2012-04-26 0:20 ` David Rientjes
2012-04-27 2:24 ` Minchan Kim
2012-04-27 3:08 ` Andrew Morton
2012-04-27 10:43 ` David Rientjes
2012-04-30 1:25 ` Minchan Kim
2012-05-01 7:20 ` Nick Piggin
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