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Message-ID: <20150508132242.GQ31732@esperanza>
Date: Fri, 8 May 2015 16:22:42 +0300
From: Vladimir Davydov <vdavydov@...allels.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Minchan Kim <minchan@...nel.org>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>,
Greg Thelen <gthelen@...gle.com>,
Michel Lespinasse <walken@...gle.com>,
David Rientjes <rientjes@...gle.com>,
Pavel Emelyanov <xemul@...allels.com>,
Cyrill Gorcunov <gorcunov@...nvz.org>,
Jonathan Corbet <corbet@....net>, <linux-api@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <linux-mm@...ck.org>,
<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] idle memory tracking
On Thu, May 07, 2015 at 05:09:39PM +0300, Vladimir Davydov wrote:
> ---- SCRIPT FOR COUNTING IDLE PAGES PER CGROUP ----
Oops, this script is stale. The correct one is here:
---
#! /usr/bin/python
#
import os
import stat
import errno
import struct
CGROUP_MOUNT = "/sys/fs/cgroup/memory"
BUFSIZE = 8 * 1024 # must be multiple of 8
def set_idle():
f = open("/proc/kpageidle", "wb", BUFSIZE)
while True:
try:
f.write(struct.pack("Q", pow(2, 64) - 1))
except IOError as err:
if err.errno == errno.ENXIO:
break
raise
f.close()
def count_idle():
f_flags = open("/proc/kpageflags", "rb", BUFSIZE)
f_cgroup = open("/proc/kpagecgroup", "rb", BUFSIZE)
f_idle = open("/proc/kpageidle", "rb", BUFSIZE)
pfn = 0
nr_idle = {}
while True:
s = f_flags.read(8)
if not s:
break
flags, = struct.unpack('Q', s)
cgino, = struct.unpack('Q', f_cgroup.read(8))
bit = pfn % 64
if not bit:
idle_bitmap, = struct.unpack('Q', f_idle.read(8))
idle = idle_bitmap >> bit & 1
pfn += 1
unevictable = flags >> 18 & 1
huge = flags >> 22 & 1
if idle and not unevictable:
nr_idle[cgino] = nr_idle.get(cgino, 0) + (512 if huge else 1)
f_flags.close()
f_cgroup.close()
f_idle.close()
return nr_idle
print "Setting the idle flag for each page..."
set_idle()
raw_input("Wait until the workload accesses its working set, then press Enter")
print "Counting idle pages..."
nr_idle = count_idle()
for dir, subdirs, files in os.walk(CGROUP_MOUNT):
ino = os.stat(dir)[stat.ST_INO]
print dir + ": " + str(nr_idle.get(ino, 0) * 4) + " KB"
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