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SubjectRe: [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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