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From: Fengguang Wu <wfg@mail.ustc.edu.cn>
To: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@osdl.org>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	David Rientjes <rientjes@google.com>,
	John Berthels <jjberthels@gmail.com>,
	Nick Piggin <nickpiggin@yahoo.com.au>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] maps: /proc/<pid>/pmaps interface - memory maps in granularity of pages
Date: Fri, 17 Aug 2007 14:47:27 +0800	[thread overview]
Message-ID: <387333248.08272@ustc.edu.cn> (raw)
Message-ID: <20070817064727.GA6723@mail.ustc.edu.cn> (raw)
In-Reply-To: <20070817023846.GJ30556@waste.org>

Matt,

It's not easy to do direct performance comparisons between pmaps and
pagemap/kpagemap. However some close analyzes are still possible :)

1) code size
pmaps                   ~200 LOC
pagemap/kpagemap        ~300 LOC

2) dataset size
take for example my running firefox on Intel Core 2:
VSZ             400 MB
RSS              64 MB, or 16k pages
pmaps            64 KB, wc shows 2k lines, or so much page ranges
pagemap         800 KB, could be heavily optimized by returning partial data
kpagemap        256 KB

3) runtime overheads
pmaps            2k lines of string processing(encode/decode)
kpagemap        16k seek()/read()s, and context switches (could be
                    optimized somehow by doing a PFN sort first, but
                    that's also non-trivial overheads)

So pmaps seems to be a clear winner :)

Thank you,
Fengguang


  parent reply	other threads:[~2007-08-17  6:47 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-16 22:05 [PATCH 0/4] process memory footprints in proc/<pid>/[s|p]maps Fengguang Wu
2007-08-16 22:05 ` Fengguang Wu
2007-08-16 22:05 ` [PATCH 1/4] maps: PSS(proportional set size) accounting in smaps Fengguang Wu
2007-08-16 22:05   ` Fengguang Wu
2007-08-17  2:13   ` Matt Mackall
2007-08-17  2:44     ` Fengguang Wu
2007-08-17  2:44       ` Fengguang Wu
2007-08-16 22:05 ` [PATCH 2/4] maps: address based vma walking Fengguang Wu
2007-08-16 22:05   ` Fengguang Wu
2007-08-17  2:16   ` Matt Mackall
2007-08-17  2:54     ` Fengguang Wu
2007-08-17  2:54       ` Fengguang Wu
2007-08-16 22:05 ` [PATCH 3/4] maps: introduce generic_maps_open() Fengguang Wu
2007-08-16 22:05   ` Fengguang Wu
2007-08-16 22:05 ` [PATCH 4/4] maps: /proc/<pid>/pmaps interface - memory maps in granularity of pages Fengguang Wu
2007-08-16 22:05   ` Fengguang Wu
2007-08-17  2:38   ` Matt Mackall
2007-08-17  3:44     ` Fengguang Wu
2007-08-17  3:44       ` Fengguang Wu
2007-08-17  3:56       ` Matt Mackall
2007-08-17  6:47     ` Fengguang Wu [this message]
2007-08-17  6:47       ` Fengguang Wu
2007-08-17 16:58       ` Matt Mackall
2007-08-18  2:48         ` Fengguang Wu
2007-08-18  2:48           ` Fengguang Wu
2007-08-18  6:40           ` Matt Mackall
2007-08-18  8:45             ` Fengguang Wu
2007-08-18  8:45               ` Fengguang Wu
2007-08-18 17:22               ` Matt Mackall
2007-08-19  0:40                 ` Fengguang Wu
2007-08-19  0:40                   ` Fengguang Wu
2007-08-18 10:31             ` Fengguang Wu
2007-08-18 10:31               ` Fengguang Wu
  -- strict thread matches above, loose matches on Subject: below --
2007-08-19  7:54 [PATCH 0/4] process memory footprint info in proc/<pid>/[s|p]maps v2 Fengguang Wu
2007-08-19  7:54 ` [PATCH 4/4] maps: /proc/<pid>/pmaps interface - memory maps in granularity of pages Fengguang Wu
2007-08-19  7:54   ` Fengguang Wu

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