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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
	Dave Chinner <dchinner@redhat.com>,
	Mike Snitzer <snitzer@redhat.com>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	"dm-devel@redhat.com" <dm-devel@redhat.com>,
	Alasdair G Kergon <agk@redhat.com>, Joe Thornber <ejt@redhat.com>,
	Mikulas Patocka <mpatocka@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Heinz Mauelshagen <heinzm@redhat.com>,
	linux-mm <linux-mm@kvack.org>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: Re: slab-nomerge (was Re: [git pull] device mapper changes for 4.3)
Date: Fri, 4 Sep 2015 00:01:41 -0700	[thread overview]
Message-ID: <CA+55aFxOR06BiyH9nfFXzidFGr77R_BGp_xypjFQJSnv5c+_-g@mail.gmail.com> (raw)
In-Reply-To: <20150904063528.GA29320@swordfish>

On Thu, Sep 3, 2015 at 11:35 PM, Sergey Senozhatsky
<sergey.senozhatsky.work@gmail.com> wrote:
>
> Out of curiosity, I did some quite simple-minded
> "slab_nomerge = 0" vs. "slab_nomerge = 1" tests today on my old
> x86_64 box (4gigs of RAM, ext4, 4.2.0-next-20150903):

So out of interest, was this slab or slub? Also, how repeatable is
this? The memory usage between two boots tends to be rather fragile -
some of the bigger slab users are dentries and inodes, and various
filesystem scanning events will end up skewing things a _lot_.

But if it turns out that the numbers are pretty stable, and sharing
really doesn't save memory, then that is certainly a big failure. I
think Christoph did much of his work for bigger machines where one of
the SLAB issues was the NUMA overhead, and who knows - maybe it worked
well for the load and machine in question, but not necessarily
elsewhere.

Interesting.

                   Linus

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  reply	other threads:[~2015-09-04  7:01 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-02 23:13 slab-nomerge (was Re: [git pull] device mapper changes for 4.3) Linus Torvalds
2015-09-03  0:48 ` Andrew Morton
2015-09-03  0:53   ` Mike Snitzer
2015-09-03  0:51 ` Mike Snitzer
2015-09-03  0:51   ` Mike Snitzer
2015-09-03  1:21   ` Linus Torvalds
2015-09-03  2:31     ` Mike Snitzer
2015-09-03  3:10       ` Christoph Lameter
2015-09-03  4:55         ` Andrew Morton
2015-09-03  6:09           ` Pekka Enberg
2015-09-03  8:53             ` Dave Chinner
2015-09-03  3:11       ` Linus Torvalds
2015-09-03  6:02     ` Dave Chinner
2015-09-03  6:13       ` Pekka Enberg
2015-09-03 10:29       ` Jesper Dangaard Brouer
2015-09-03 16:19         ` Christoph Lameter
2015-09-04  9:10           ` Jesper Dangaard Brouer
2015-09-04 14:13             ` Christoph Lameter
2015-09-04  6:35         ` Sergey Senozhatsky
2015-09-04  7:01           ` Linus Torvalds [this message]
2015-09-04  7:59             ` Sergey Senozhatsky
2015-09-04  9:56               ` Sergey Senozhatsky
2015-09-04 14:05               ` Christoph Lameter
2015-09-04 14:11               ` Linus Torvalds
2015-09-05  2:09                 ` Sergey Senozhatsky
2015-09-05  2:09                   ` Sergey Senozhatsky
2015-09-05 20:33                   ` Linus Torvalds
2015-09-07  8:44                     ` Sergey Senozhatsky
2015-09-08  0:22                       ` Sergey Senozhatsky
2015-09-03 15:02       ` Linus Torvalds
2015-09-04  3:26         ` Dave Chinner
2015-09-04  3:51           ` Linus Torvalds
2015-09-05  0:36             ` Dave Chinner
2015-09-05  0:36               ` Dave Chinner
2015-09-07  9:30             ` Jesper Dangaard Brouer
2015-09-07 20:22               ` Linus Torvalds
2015-09-07 20:22                 ` Linus Torvalds
2015-09-07 21:17                 ` Jesper Dangaard Brouer
2015-09-04 13:55           ` Christoph Lameter
2015-09-04 22:46             ` Dave Chinner
2015-09-05  0:25               ` Christoph Lameter
2015-09-05  1:16                 ` Dave Chinner

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