From: JoonSoo Kim <js1304@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 3/3] slub: release a lock if freeing object with a lock is failed in __slab_free()
Date: Mon, 9 Jul 2012 01:19:09 +0900 [thread overview]
Message-ID: <CAAmzW4PzJiBFDR3rKwVBn0Ex5cCR=qai6SA9_SbVH-psuh6nOQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1207061008560.28648@router.home>
2012/7/7 Christoph Lameter <cl@linux.com>:
> On Fri, 6 Jul 2012, JoonSoo Kim wrote:
>
>> >> At CPU2, we don't need lock anymore, because this slab already in partial list.
>> >
>> > For that scenario we could also simply do a trylock there and redo
>> > the loop if we fail. But still what guarantees that another process will
>> > not modify the page struct between fetching the data and a successful
>> > trylock?
>>
>>
>> I'm not familiar with English, so take my ability to understand into
>> consideration.
>
> I have a hard time understanding what you want to accomplish here.
>
>> we don't need guarantees that another process will not modify
>> the page struct between fetching the data and a successful trylock.
>
> No we do not need that since the cmpxchg will then fail.
>
> Maybe it would be useful to split this patch into two?
>
> One where you introduce the dropping of the lock and the other where you
> get rid of certain code paths?
>
Dropping of the lock is need for getting rid of certain code paths.
So, I can't split this patch into two.
Sorry for confusing all the people.
I think that I don't explain my purpose well.
I will prepare new version in which I explain purpose of patch better.
Thanks for kind review.
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next prev parent reply other threads:[~2012-07-08 16:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <yes>
2012-06-08 17:23 ` [PATCH 1/4] slub: change declare of get_slab() to inline at all times Joonsoo Kim
2012-06-08 17:23 ` [PATCH 2/4] slub: use __cmpxchg_double_slab() at interrupt disabled place Joonsoo Kim
2012-06-08 17:23 ` [PATCH 3/4] slub: refactoring unfreeze_partials() Joonsoo Kim
2012-06-20 7:19 ` Pekka Enberg
2012-06-08 17:23 ` [PATCH 4/4] slub: deactivate freelist of kmem_cache_cpu all at once in deactivate_slab() Joonsoo Kim
2012-06-08 19:04 ` Christoph Lameter
2012-06-10 10:27 ` JoonSoo Kim
2012-06-22 18:34 ` JoonSoo Kim
2012-06-08 19:02 ` [PATCH 1/4] slub: change declare of get_slab() to inline at all times Christoph Lameter
2012-06-09 15:57 ` JoonSoo Kim
2012-06-11 15:04 ` Christoph Lameter
2012-06-22 18:22 ` [PATCH 1/3] slub: prefetch next freelist pointer in __slab_alloc() Joonsoo Kim
2012-06-22 18:22 ` [PATCH 2/3] slub: reduce failure of this_cpu_cmpxchg in put_cpu_partial() after unfreezing Joonsoo Kim
2012-07-04 13:05 ` Pekka Enberg
2012-07-05 14:20 ` Christoph Lameter
2012-08-16 7:06 ` Pekka Enberg
2012-06-22 18:22 ` [PATCH 3/3] slub: release a lock if freeing object with a lock is failed in __slab_free() Joonsoo Kim
2012-07-04 13:10 ` Pekka Enberg
2012-07-04 14:48 ` JoonSoo Kim
2012-07-05 14:26 ` Christoph Lameter
2012-07-06 14:19 ` JoonSoo Kim
2012-07-06 14:34 ` Christoph Lameter
2012-07-06 14:59 ` JoonSoo Kim
2012-07-06 15:10 ` Christoph Lameter
2012-07-08 16:19 ` JoonSoo Kim [this message]
2012-06-22 18:45 ` [PATCH 1/3 v2] slub: prefetch next freelist pointer in __slab_alloc() Joonsoo Kim
2012-07-04 12:58 ` JoonSoo Kim
2012-07-04 13:00 ` Pekka Enberg
2012-07-04 14:30 ` JoonSoo Kim
2012-07-04 15:08 ` Pekka Enberg
2012-07-04 15:26 ` Eric Dumazet
2012-07-04 15:48 ` JoonSoo Kim
2012-07-04 16:15 ` Eric Dumazet
2012-07-04 16:24 ` JoonSoo Kim
2012-07-04 15:45 ` JoonSoo Kim
2012-07-04 15:59 ` Pekka Enberg
2012-07-04 16:04 ` JoonSoo Kim
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