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From: Joonsoo Kim <js1304@gmail.com>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@suse.cz>,
	Linux Memory Management List <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -mm 3/3] slub: make dead caches discard free slabs immediately
Date: Tue, 27 Jan 2015 18:21:14 +0900	[thread overview]
Message-ID: <CAAmzW4N+HVEO7_29QpzW9ezask4FZYVVUdm0eMKv4CdUwLWYxQ@mail.gmail.com> (raw)
In-Reply-To: <20150127082301.GD28978@esperanza>

2015-01-27 17:23 GMT+09:00 Vladimir Davydov <vdavydov@parallels.com>:
> Hi Joonsoo,
>
> On Tue, Jan 27, 2015 at 05:00:09PM +0900, Joonsoo Kim wrote:
>> On Mon, Jan 26, 2015 at 03:55:29PM +0300, Vladimir Davydov wrote:
>> > @@ -3381,6 +3390,15 @@ void __kmem_cache_shrink(struct kmem_cache *s)
>> >             kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL);
>> >     unsigned long flags;
>> >
>> > +   if (deactivate) {
>> > +           /*
>> > +            * Disable empty slabs caching. Used to avoid pinning offline
>> > +            * memory cgroups by freeable kmem pages.
>> > +            */
>> > +           s->cpu_partial = 0;
>> > +           s->min_partial = 0;
>> > +   }
>> > +
>>
>> Maybe, kick_all_cpus_sync() is needed here since object would
>> be freed asynchronously so they can't see this updated value.
>
> I thought flush_all() should do the trick, no?

Unfortunately, it doesn't.

flush_all() sends IPI to not all cpus. It only sends IPI to cpus where
some conditions
are met and freeing could occur on the other ones.

Thanks.

  reply	other threads:[~2015-01-27  9:21 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 12:55 [PATCH -mm 0/3] " Vladimir Davydov
2015-01-26 12:55 ` [PATCH -mm 1/3] slub: don't fail kmem_cache_shrink if slab placement optimization fails Vladimir Davydov
2015-01-26 15:48   ` Christoph Lameter
2015-01-26 17:01     ` Vladimir Davydov
2015-01-26 18:24       ` Christoph Lameter
2015-01-26 19:36         ` Vladimir Davydov
2015-01-26 19:53           ` Christoph Lameter
2015-01-27 12:58             ` Vladimir Davydov
2015-01-27 17:02               ` Christoph Lameter
2015-01-28 15:00                 ` Vladimir Davydov
2015-01-26 12:55 ` [PATCH -mm 2/3] slab: zap kmem_cache_shrink return value Vladimir Davydov
2015-01-26 15:49   ` Christoph Lameter
2015-01-26 17:04     ` Vladimir Davydov
2015-01-26 18:26       ` Christoph Lameter
2015-01-26 19:48         ` Vladimir Davydov
2015-01-26 19:55           ` Christoph Lameter
2015-01-26 20:16             ` Vladimir Davydov
2015-01-26 20:28               ` Christoph Lameter
2015-01-26 20:43                 ` Vladimir Davydov
2015-01-26 12:55 ` [PATCH -mm 3/3] slub: make dead caches discard free slabs immediately Vladimir Davydov
2015-01-27  8:00   ` Joonsoo Kim
2015-01-27  8:23     ` Vladimir Davydov
2015-01-27  9:21       ` Joonsoo Kim [this message]
2015-01-27  9:28         ` Vladimir Davydov

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