From: Minchan Kim <minchan@kernel.org>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [PATCH] mm/zsmalloc: add compact column to pool stat
Date: Mon, 29 Feb 2016 15:02:47 +0900 [thread overview]
Message-ID: <20160229060247.GA3382@bbox> (raw)
In-Reply-To: <1456554233-9088-1-git-send-email-sergey.senozhatsky@gmail.com>
On Sat, Feb 27, 2016 at 03:23:53PM +0900, Sergey Senozhatsky wrote:
> Add a new column to pool stats, which will tell us class' zs_can_compact()
> number, so it will be easier to analyze zsmalloc fragmentation.
Just nitpick:
Strictly speaking, zs_can_compact number is number of "ideal freeable page
by compaction". How about using high level term in description rather than
function name?
>
> At the moment, we have only numbers of FULL and ALMOST_EMPTY classes, but
> they don't tell us how badly the class is fragmented internally.
>
> The new /sys/kernel/debug/zsmalloc/zramX/classes output look as follows:
>
> class size almost_full almost_empty obj_allocated obj_used pages_used pages_per_zspage compact
> [..]
> 12 224 0 2 146 5 8 4 4
> 13 240 0 0 0 0 0 1 0
> 14 256 1 13 1840 1672 115 1 10
> 15 272 0 0 0 0 0 1 0
> [..]
> 49 816 0 3 745 735 149 1 2
> 51 848 3 4 361 306 76 4 8
> 52 864 12 14 378 268 81 3 21
> 54 896 1 12 117 57 26 2 12
> 57 944 0 0 0 0 0 3 0
> [..]
> Total 26 131 12709 10994 1071 134
>
> For example, from this particular output we can easily conclude that class-896
> is heavily fragmented -- it occupies 26 pages, 12 can be freed by compaction.
How about using "freeable" or something which could represent "freeable"?
IMO, it's more strightforward for user.
Other than that,
Acked-by: Minchan Kim <minchan@kernel.org>
Thanks for the nice job!
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next prev parent reply other threads:[~2016-02-29 6:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-27 6:23 [PATCH] mm/zsmalloc: add compact column to pool stat Sergey Senozhatsky
2016-02-29 6:02 ` Minchan Kim [this message]
2016-02-29 6:26 ` Sergey Senozhatsky
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