linux-kernel - Re: [PATCH v4 0/3] idle memory tracking

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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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