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linux-2.6
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linux-2.6/fs
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David Rientjes b813e931b4 smaps: add clear_refs file to clear reference 
Adds /proc/pid/clear_refs.  When any non-zero number is written to this file,
pte_mkold() and ClearPageReferenced() is called for each pte and its
corresponding page, respectively, in that task's VMAs.  This file is only
writable by the user who owns the task.

It is now possible to measure _approximately_ how much memory a task is using
by clearing the reference bits with

	echo 1 > /proc/pid/clear_refs

and checking the reference count for each VMA from the /proc/pid/smaps output
at a measured time interval.  For example, to observe the approximate change
in memory footprint for a task, write a script that clears the references
(echo 1 > /proc/pid/clear_refs), sleeps, and then greps for Pgs_Referenced and
extracts the size in kB.  Add the sizes for each VMA together for the total
referenced footprint.  Moments later, repeat the process and observe the
difference.

For example, using an efficient Mozilla:

	accumulated time		referenced memory
	----------------		-----------------
		 0 s				 408 kB
		 1 s				 408 kB
		 2 s				 556 kB
		 3 s				1028 kB
		 4 s				 872 kB
		 5 s				1956 kB
		 6 s				 416 kB
		 7 s				1560 kB
		 8 s				2336 kB
		 9 s				1044 kB
		10 s				 416 kB

This is a valuable tool to get an approximate measurement of the memory
footprint for a task.

Cc: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
[akpm@linux-foundation.org: build fixes]
[mpm@selenic.com: rename for_each_pmd]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-05-07 12:12:52 -07:00
..
9p v9fs: don't use primary fid when removing file 2007-04-24 08:23:08 -07:00
adfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
affs [PATCH] affs: implement ->drop_inode 2007-02-20 17:10:15 -08:00
afs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
autofs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
autofs4 [PATCH] autofs4: fix race in unhashed dentry code 2007-04-12 15:31:42 -07:00
befs [PATCH] mark struct inode_operations const 1 2007-02-12 09:48:46 -08:00
bfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
cifs [CIFS] Fix typo in cifs readme from previous commit 2007-05-05 22:08:06 +00:00
coda [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
configfs remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
cramfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
debugfs remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
devpts [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
dlm remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
ecryptfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
efs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
exportfs [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers 2006-10-03 08:03:40 -07:00
ext2 mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
ext3 [PATCH] revert "retries in ext3_prepare_write() violate ordering requirements" 2007-04-02 10:06:08 -07:00
ext4 [PATCH] revert "retries in ext4_prepare_write() violate ordering requirements" 2007-04-02 10:06:08 -07:00
fat [PATCH] FAT: DIO-write fallback to normal buffered 2007-02-20 17:10:14 -08:00
freevxfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
fuse remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
gfs2 remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
hfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
hfsplus [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
hostfs [PATCH] uml: hostfs variable renaming 2007-03-29 08:22:25 -07:00
hpfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
hppfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
hugetlbfs proper prototype for hugetlb_get_unmapped_area() 2007-05-07 12:12:51 -07:00
isofs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
jbd [PATCH] jbd: wait for already submitted t_sync_datalist buffer to complete 2006-12-22 08:55:51 -08:00
jbd2 [PATCH] jbd2: wait for already submitted t_sync_datalist buffer to complete 2006-12-07 08:39:42 -08:00
jffs2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2007-04-27 19:16:19 +01:00
jfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6 2007-02-26 11:44:51 -08:00
lockd SUNRPC: RPC buffer size estimates are too large 2007-04-30 22:17:10 -07:00
minix mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
msdos [PATCH] mark struct inode_operations const 2 2007-02-12 09:48:46 -08:00
ncpfs ncpfs: make sure server connection survives a kill 2007-03-06 13:26:27 +01:00
nfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
nfs_common [PATCH] nfs_common endianness annotations 2006-10-20 10:26:41 -07:00
nfsd SUNRPC: RPC buffer size estimates are too large 2007-04-30 22:17:10 -07:00
nls [PATCH] fs: make nls_cp936.c handle some U00XY characters and U20AC correctly 2006-12-07 08:39:46 -08:00
ntfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
ocfs2 mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
openpromfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
partitions mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
proc smaps: add clear_refs file to clear reference 2007-05-07 12:12:52 -07:00
qnx4 [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
ramfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
reiserfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
romfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
smbfs [PATCH] smbfs: double free memory corruption 2007-03-16 19:25:05 -07:00
sysfs remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
sysv mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
udf [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
ufs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
vfat [PATCH] mark struct inode_operations const 3 2007-02-12 09:48:46 -08:00
xfs [PATCH] Make XFS workqueues nonfreezable 2007-03-22 19:39:06 -07:00
Kconfig Merge git://git.linux-nfs.org/pub/linux/nfs-2.6 2007-05-04 19:55:11 -07:00
Kconfig.binfmt
…
Makefile Remove JFFS (version 1), as scheduled. 2007-02-17 16:10:59 -05:00
aio.c [PATCH] aio: remove bare user-triggerable error printk 2007-03-27 17:53:25 -07:00
attr.c
…
bad_inode.c [PATCH] mark struct inode_operations const 1 2007-02-12 09:48:46 -08:00
binfmt_aout.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
binfmt_elf.c [PATCH] fix page leak during core dump 2007-04-02 10:06:08 -07:00
binfmt_elf_fdpic.c [PATCH] fix page leak during core dump 2007-04-02 10:06:08 -07:00
binfmt_em86.c
…
binfmt_flat.c [PATCH] uclinux: correctly remap bin_fmtflat exe allocated mem regions 2007-02-09 10:45:33 -08:00
binfmt_misc.c [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
binfmt_script.c
…
binfmt_som.c [PARISC] Fix fs/binfmt_som.c 2006-10-04 06:51:26 -06:00
bio.c [BLOCK] Don't pin lots of memory in mempools 2007-04-30 09:08:17 +02:00
block_dev.c [PATCH] lockdep: annotate BLKPG_DEL_PARTITION 2007-02-20 17:10:16 -08:00
buffer.c fs: buffer don't PageUptodate without page locked 2007-05-07 12:12:51 -07:00
char_dev.c [PATCH] remove protection of LANANA-reserved majors 2007-04-04 21:12:47 -07:00
compat.c [PATCH] x86-64: Print type and size correctly for unknown compat ioctls 2007-05-02 19:27:21 +02:00
compat_ioctl.c [PATCH] x86-64: Shut up warnings for vfat compat ioctls on other file systems 2007-05-02 19:27:21 +02:00
dcache.c Revert "[PATCH] Fix d_path for lazy unmounts" 2007-02-13 12:08:18 -08:00
dcookies.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
direct-io.c [PATCH] dio: lock refcount operations 2006-12-10 09:57:21 -08:00
dnotify.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
dquot.c [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
drop_caches.c [PATCH] remove invalidate_inode_pages() 2007-02-11 10:51:31 -08:00
eventpoll.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
exec.c exec.c: fix coredump to pipe problem and obscure "security hole" 2007-04-17 16:36:26 -07:00
fcntl.c [PATCH] fdtable: Make fdarray and fdsets equal in size 2006-12-10 09:57:22 -08:00
fifo.c
…
file.c [PATCH] fdtable: Provide free_fdtable() wrapper 2006-12-22 08:55:50 -08:00
file_table.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
filesystems.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
fs-writeback.c Write back inode data pages even when the inode itself is locked 2007-01-26 12:53:20 -08:00
generic_acl.c [PATCH] Generic infrastructure for acls 2006-09-29 09:18:24 -07:00
inode.c [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
inotify.c [PATCH] severing fs.h, radix-tree.h -> sched.h 2006-12-04 02:00:24 -05:00
inotify_user.c [PATCH] inotify: read return val fix 2007-02-12 09:48:28 -08:00
internal.h [PATCH] CONFIG_BLOCK internal.h cleanups 2006-09-30 20:52:32 +02:00
ioctl.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
ioprio.c [PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task 2007-02-12 09:48:32 -08:00
libfs.c [PATCH] shmem and simple const super_operations 2007-03-05 07:57:51 -08:00
locks.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
mbcache.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
mpage.c [PATCH] BLOCK: Dissociate generic_writepages() from mpage stuff [try #6] 2006-09-30 20:52:26 +02:00
namei.c mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
namespace.c [PATCH] Transform kmem_cache_alloc()+memset(0) -> kmem_cache_zalloc(). 2007-02-11 10:51:27 -08:00
nfsctl.c
…
no-block.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
open.c [PATCH] fdtable: Make fdarray and fdsets equal in size 2006-12-10 09:57:22 -08:00
pipe.c [PATCH] AUDIT_FD_PAIR 2007-02-17 21:30:15 -05:00
pnode.c [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
pnode.h [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
posix_acl.c [PATCH] kmemdup: some users 2006-10-01 00:39:19 -07:00
quota.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
quota_v1.c
…
quota_v2.c
…
read_write.c [PATCH] FS: speed up rw_verify_area() 2007-02-12 09:48:29 -08:00
read_write.h [PATCH] Remove readv/writev methods and use aio_read/aio_write instead 2006-10-01 00:39:28 -07:00
readdir.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
select.c [PATCH] fdtable: Make fdarray and fdsets equal in size 2006-12-10 09:57:22 -08:00
seq_file.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
splice.c [PATCH] splice: partial write fix 2007-03-29 14:26:42 +02:00
stack.c [PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied 2007-02-19 14:21:50 -08:00
stat.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
super.c the overdue removal of the mount/umount uevents 2007-04-27 10:57:31 -07:00
sync.c [PATCH] Turn do_sync_file_range() into do_sync_mapping_range() 2007-04-26 15:02:26 -07:00
utimes.c [PATCH] severing fs.h, radix-tree.h -> sched.h 2006-12-04 02:00:24 -05:00
xattr.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
xattr_acl.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00