From: Dan Magenheimer <dan.magenheimer@oracle.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>,
Pekka Enberg <penberg@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Seth Jennings <sjenning@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
cl@linux-foundation.org
Subject: RE: [PATCH 4/4] zsmalloc: zsmalloc: align cache line size
Date: Tue, 8 May 2012 20:08:29 -0700 (PDT) [thread overview]
Message-ID: <8a42cbff-f7f2-400a-a9c1-c3b3d73ab979@default> (raw)
In-Reply-To: <4FA9C127.5020908@kernel.org>
> From: Minchan Kim [mailto:minchan@kernel.org]
> Subject: Re: [PATCH 4/4] zsmalloc: zsmalloc: align cache line size
>
> On 05/08/2012 11:00 PM, Dan Magenheimer wrote:
>
> >> From: Minchan Kim [mailto:minchan@kernel.org]
> >>> zcache can potentially create a lot of pools, so the latter will save
> >>> some memory.
> >>
> >>
> >> Dumb question.
> >> Why should we create pool per user?
> >> What's the problem if there is only one pool in system?
> >
> > zcache doesn't use zsmalloc for cleancache pages today, but
> > that's Seth's plan for the future. Then if there is a
> > separate pool for each cleancache pool, when a filesystem
> > is umount'ed, it isn't necessary to walk through and delete
> > all pages one-by-one, which could take quite awhile.
>
> > ramster needs one pool for each client (i.e. machine in the
> > cluster) for frontswap pages for the same reason, and
> > later, for cleancache pages, one per mounted filesystem
> > per client
>
> Fair enough.
>
> Then, how about this interfaces like slab?
>
> 1. zs_handle zs_malloc(size_t size, gfp_t flags) - share a pool by many subsystem(like kmalloc)
> 2. zs_handle zs_malloc_pool(struct zs_pool *pool, size_t size) - use own pool(like kmem_cache_alloc)
>
> Any thoughts?
Seems fine to me.
> But some subsystems can't want a own pool for not waste unnecessary memory.
Are you using zsmalloc for something else in the kernel? I'm
wondering what other subsystem would have random size allocations
always less than a page.
Thanks,
Dan
next prev parent reply other threads:[~2012-05-09 3:08 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-03 6:40 [PATCH 1/4] zsmalloc: rename zspage_order with zspage_pages Minchan Kim
2012-05-03 6:40 ` [PATCH 2/4] zsmalloc: add/fix function comment Minchan Kim
2012-05-03 13:19 ` Nitin Gupta
2012-05-03 6:40 ` [PATCH 3/4] zsmalloc use zs_handle instead of void * Minchan Kim
2012-05-03 13:32 ` Nitin Gupta
2012-05-03 15:23 ` Seth Jennings
2012-05-04 2:24 ` Minchan Kim
2012-05-07 15:01 ` Seth Jennings
2012-05-09 20:19 ` Greg Kroah-Hartman
2012-05-10 2:03 ` Minchan Kim
2012-05-10 14:02 ` Konrad Rzeszutek Wilk
2012-05-10 14:12 ` Greg Kroah-Hartman
2012-05-10 14:47 ` Nitin Gupta
2012-05-10 15:00 ` Minchan Kim
2012-05-10 15:11 ` Seth Jennings
2012-05-10 15:19 ` Minchan Kim
2012-05-10 15:19 ` Greg Kroah-Hartman
2012-05-10 16:29 ` Nitin Gupta
2012-05-10 16:44 ` Greg Kroah-Hartman
2012-05-10 17:24 ` Nitin Gupta
2012-05-10 17:33 ` Konrad Rzeszutek Wilk
2012-05-10 23:24 ` Minchan Kim
2012-05-10 23:50 ` Dan Magenheimer
2012-05-11 0:14 ` Minchan Kim
2012-05-11 16:31 ` Dan Magenheimer
2012-05-11 19:29 ` Konrad Rzeszutek Wilk
2012-05-11 21:49 ` Seth Jennings
2012-05-14 2:26 ` Minchan Kim
2012-05-11 19:28 ` Konrad Rzeszutek Wilk
2012-05-14 2:18 ` Minchan Kim
2012-05-15 1:57 ` Nitin Gupta
2012-05-15 2:21 ` Minchan Kim
2012-05-15 15:04 ` Konrad Rzeszutek Wilk
2012-05-16 1:36 ` Minchan Kim
2012-05-16 11:06 ` Konrad Rzeszutek Wilk
2012-05-03 6:40 ` [PATCH 4/4] zsmalloc: zsmalloc: align cache line size Minchan Kim
2012-05-03 13:58 ` Nitin Gupta
2012-05-04 2:27 ` Minchan Kim
2012-05-07 7:41 ` Pekka Enberg
2012-05-07 12:40 ` Nitin Gupta
2012-05-08 1:34 ` Minchan Kim
2012-05-08 14:00 ` Dan Magenheimer
2012-05-09 0:58 ` Minchan Kim
2012-05-09 3:08 ` Dan Magenheimer [this message]
2012-05-09 4:07 ` Minchan Kim
2012-05-11 0:03 ` Dan Magenheimer
2012-05-11 0:25 ` Minchan Kim
2012-05-11 19:06 ` Konrad Rzeszutek Wilk
2012-05-14 1:55 ` Minchan Kim
2012-05-15 15:18 ` Konrad Rzeszutek Wilk
2012-05-16 1:44 ` Minchan Kim
2012-05-03 13:18 ` [PATCH 1/4] zsmalloc: rename zspage_order with zspage_pages Nitin Gupta
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