From: Vlastimil Babka <vbabka@suse.cz>
To: Michal Hocko <mhocko@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>, Roman Gushchin <guro@fb.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com
Subject: Re: [PATCH 3/3] dcache: account external names as indirectly reclaimable memory
Date: Mon, 16 Apr 2018 14:06:21 +0200 [thread overview]
Message-ID: <1475594b-c1ad-9625-7aeb-ad8ad385b793@suse.cz> (raw)
In-Reply-To: <20180416114144.GK17484@dhcp22.suse.cz>
On 04/16/2018 01:41 PM, Michal Hocko wrote:
> On Fri 13-04-18 10:37:16, Johannes Weiner wrote:
>> On Fri, Apr 13, 2018 at 04:28:21PM +0200, Michal Hocko wrote:
>>> On Fri 13-04-18 16:20:00, Vlastimil Babka wrote:
>>>> We would need kmalloc-reclaimable-X variants. It could be worth it,
>>>> especially if we find more similar usages. I suspect they would be more
>>>> useful than the existing dma-kmalloc-X :)
>>>
>>> I am still not sure why __GFP_RECLAIMABLE cannot be made work as
>>> expected and account slab pages as SLAB_RECLAIMABLE
>>
>> Can you outline how this would work without separate caches?
>
> I thought that the cache would only maintain two sets of slab pages
> depending on the allocation reuquests. I am pretty sure there will be
> other details to iron out and
For example the percpu (and other) array caches...
> maybe it will turn out that such a large
> portion of the chache would need to duplicate the state that a
> completely new cache would be more reasonable.
I'm afraid that's the case, yes.
> Is this worth exploring
> at least? I mean something like this should help with the fragmentation
> already AFAIU. Accounting would be just free on top.
Yep. It could be also CONFIG_urable so smaller systems don't need to
deal with the memory overhead of this.
So do we put it on LSF/MM agenda?
next prev parent reply other threads:[~2018-04-16 12:06 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 13:37 [PATCH 0/3] indirectly reclaimable memory Roman Gushchin
2018-03-05 13:37 ` [PATCH 1/3] mm: introduce NR_INDIRECTLY_RECLAIMABLE_BYTES Roman Gushchin
2018-04-11 13:16 ` Vlastimil Babka
2018-04-11 13:56 ` Roman Gushchin
2018-04-12 6:52 ` Vlastimil Babka
2018-04-12 11:52 ` Michal Hocko
2018-04-12 14:38 ` Roman Gushchin
2018-04-12 14:46 ` Michal Hocko
2018-04-12 14:57 ` Roman Gushchin
2018-04-13 6:59 ` Michal Hocko
2018-04-13 12:13 ` vinayak menon
2018-04-25 3:49 ` Vijayanand Jitta
2018-04-25 12:52 ` Roman Gushchin
2018-04-25 15:47 ` Vlastimil Babka
2018-04-25 16:48 ` Roman Gushchin
2018-04-25 17:02 ` Vlastimil Babka
2018-04-25 17:23 ` Roman Gushchin
2018-04-25 15:55 ` Matthew Wilcox
2018-04-25 16:59 ` Vlastimil Babka
2018-03-05 13:37 ` [PATCH 2/3] mm: add indirectly reclaimable memory to MemAvailable Roman Gushchin
2018-03-05 13:47 ` Roman Gushchin
2018-03-05 13:37 ` [PATCH 2/3] mm: treat indirectly reclaimable memory as available in MemAvailable Roman Gushchin
2018-03-05 13:37 ` [PATCH 3/3] dcache: account external names as indirectly reclaimable memory Roman Gushchin
2018-03-12 21:17 ` Al Viro
2018-03-12 22:36 ` Roman Gushchin
2018-03-13 0:45 ` Al Viro
2018-04-05 22:11 ` Andrew Morton
2018-04-06 10:32 ` Roman Gushchin
2018-04-13 13:35 ` Minchan Kim
2018-04-13 13:59 ` Michal Hocko
2018-04-13 14:20 ` Vlastimil Babka
2018-04-13 14:28 ` Michal Hocko
2018-04-13 14:37 ` Johannes Weiner
2018-04-16 11:41 ` Michal Hocko
2018-04-16 12:06 ` Vlastimil Babka [this message]
2018-04-16 12:27 ` Michal Hocko
2018-04-16 19:57 ` Vlastimil Babka
2018-04-17 6:44 ` Michal Hocko
2018-04-16 13:09 ` Matthew Wilcox
2018-04-17 11:24 ` Roman Gushchin
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