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