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From: aruna.ramakrishna@oracle.com
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v3] mm/slab: Improve performance of gathering slabinfo stats
Date: Thu, 18 Aug 2016 22:47:59 -0700	[thread overview]
Message-ID: <57B69D8F.5000101@oracle.com> (raw)
In-Reply-To: <20160818115218.GJ30162@dhcp22.suse.cz>

On 08/18/2016 04:52 AM, Michal Hocko wrote:
> I am not opposing the patch (to be honest it is quite neat) but this
> is buggering me for quite some time. Sorry for hijacking this email
> thread but I couldn't resist. Why are we trying to optimize SLAB and
> slowly converge it to SLUB feature-wise. I always thought that SLAB
> should remain stable and time challenged solution which works reasonably
> well for many/most workloads, while SLUB is an optimized implementation
> which experiment with slightly different concepts that might boost the
> performance considerably but might also surprise from time to time. If
> this is not the case then why do we have both of them in the kernel. It
> is a lot of code and some features need tweaking both while only one
> gets testing coverage. So this is mainly a question for maintainers. Why
> do we maintain both and what is the purpose of them.

Michal,

Speaking about this patch specifically - I'm not trying to optimize SLAB 
or make it more similar to SLUB. This patch is a bug fix for an issue 
where the slowness of 'cat /proc/slabinfo' caused timeouts in other 
drivers. While optimizing that flow, it became apparent (as Christoph 
pointed out) that one could converge this patch to SLUB's current 
implementation. Though I have not done that in this patch (because that 
warrants a separate patch), I think it makes sense to converge where 
appropriate, since they both do share some common data structures and 
code already.

Thanks,
Aruna

  reply	other threads:[~2016-08-19  5:48 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-17 18:20 Aruna Ramakrishna
2016-08-17 19:03 ` Eric Dumazet
2016-08-17 19:25   ` Aruna Ramakrishna
2016-08-18 11:52 ` Michal Hocko
2016-08-19  5:47   ` aruna.ramakrishna [this message]
2016-08-23  2:13   ` Joonsoo Kim
2016-08-23 15:38     ` what is the purpose of SLAB and SLUB (was: Re: [PATCH v3] mm/slab: Improve performance of gathering slabinfo) stats Michal Hocko
2016-08-23 15:54       ` what is the purpose of SLAB and SLUB Andi Kleen
2016-08-25  4:10         ` Christoph Lameter
2016-08-25  7:32           ` Michal Hocko
2016-08-25 19:49             ` Christoph Lameter
2016-08-24  1:15       ` what is the purpose of SLAB and SLUB (was: Re: [PATCH v3] mm/slab: Improve performance of gathering slabinfo) stats Joonsoo Kim
2016-08-24  8:05         ` Michal Hocko
2016-08-24  8:20       ` Mel Gorman
2016-08-25  4:01         ` Christoph Lameter
2016-08-25 10:07           ` Mel Gorman
2016-08-25 19:55             ` Christoph Lameter
2016-08-26 20:47               ` what is the purpose of SLAB and SLUB Andi Kleen
2016-08-29 13:44                 ` Michal Hocko
2016-08-29 14:49                   ` Christoph Lameter
2016-08-30  9:39               ` what is the purpose of SLAB and SLUB (was: Re: [PATCH v3] mm/slab: Improve performance of gathering slabinfo) stats Mel Gorman
2016-08-30 19:32                 ` Christoph Lameter

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