Rafael J. Wysocki 22af48be82 x86 / CPU: Always show current CPU frequency in /proc/cpuinfo ... commit 7d5905dc14 upstream. After commit 890da9cf09 (Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"") the "cpu MHz" number in /proc/cpuinfo on x86 can be either the nominal CPU frequency (which is constant) or the frequency most recently requested by a scaling governor in cpufreq, depending on the cpufreq configuration. That is somewhat inconsistent and is different from what it was before 4.13, so in order to restore the previous behavior, make it report the current CPU frequency like the scaling_cur_freq sysfs file in cpufreq. To that end, modify the /proc/cpuinfo implementation on x86 to use aperfmperf_snapshot_khz() to snapshot the APERF and MPERF feedback registers, if available, and use their values to compute the CPU frequency to be reported as "cpu MHz". However, do that carefully enough to avoid accumulating delays that lead to unacceptable access times for /proc/cpuinfo on systems with many CPUs. Run aperfmperf_snapshot_khz() once on all CPUs asynchronously at the /proc/cpuinfo open time, add a single delay upfront (if necessary) at that point and simply compute the current frequency while running show_cpuinfo() for each individual CPU. Also, to avoid slowing down /proc/cpuinfo accesses too much, reduce the default delay between consecutive APERF and MPERF reads to 10 ms, which should be sufficient to get large enough numbers for the frequency computation in all cases. Fixes: 890da9cf09 (Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"") Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-01-10 09:31:20 +01:00
..
9p	fs/9p: Compare qid.path in v9fs_test_inode	2017-11-30 08:40:49 +00:00
adfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
affs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
afs	afs: Connect up the CB.ProbeUuid	2017-12-14 09:53:15 +01:00
autofs4	autofs: fix careless error in recent commit	2017-12-20 10:10:17 +01:00
befs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
bfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
btrfs	btrfs: fix refcount_t usage when deleting btrfs_delayed_nodes	2018-01-10 09:31:17 +01:00
cachefiles	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ceph	ceph: drop negative child dentries before try pruning inode's alias	2017-12-20 10:10:19 +01:00
cifs	cifs: fix NULL deref in SMB2_read	2017-12-20 10:10:17 +01:00
coda	coda: fix 'kernel memory exposure attempt' in fsync	2017-11-24 08:37:05 +01:00
configfs
cramfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
crypto	fscrypt: lock mutex before checking for bounce page pool	2017-11-30 08:40:44 +00:00
debugfs
devpts
dlm	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ecryptfs	eCryptfs: use after free in ecryptfs_release_messaging()	2017-11-30 08:40:45 +00:00
efivarfs
efs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
exofs
exportfs
ext2	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ext4	ext4: fix crash when a directory's i_size is too small	2017-12-20 10:10:22 +01:00
f2fs	f2fs: fix to clear FI_NO_PREALLOC	2017-12-14 09:53:14 +01:00
fat	fs/fat/inode.c: fix sb_rdonly() change	2017-12-05 11:26:29 +01:00
freevxfs
fscache	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fuse	fuse: fix READDIRPLUS skipping an entry	2017-10-25 16:34:27 +02:00
gfs2	GFS2: Take inode off order_write list when setting jdata flag	2017-12-20 10:10:29 +01:00
hfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hfsplus	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hostfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hpfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hugetlbfs	fs/hugetlbfs/inode.c: fix hwpoison reserve accounting	2017-11-03 07:39:19 -07:00
isofs	isofs: fix timestamps beyond 2027	2017-11-30 08:40:45 +00:00
jbd2
jffs2	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
jfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
kernfs
lockd	lockd: lost rollback of set_grace_period() in lockd_down_net()	2017-12-05 11:26:30 +01:00
minix	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ncpfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
nfs	nfs: don't wait on commit in nfs_commit_inode() if there were no commit requests	2017-12-20 10:10:20 +01:00
nfs_common
nfsd	kernel: make groups_sort calling a responsibility group_info allocators	2017-12-20 10:10:18 +01:00
nilfs2	nilfs2: fix race condition that causes file system corruption	2017-11-30 08:40:44 +00:00
nls	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
notify	fsnotify: fix pinning group in fsnotify_prepare_user_wait()	2017-11-30 08:40:47 +00:00
ntfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ocfs2	ocfs2: should wait dio before inode lock in ocfs2_setattr()	2017-11-24 08:37:04 +01:00
omfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
openpromfs
orangefs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
overlayfs	locking/barriers: Convert users of lockless_dereference() to READ_ONCE()	2017-12-25 14:26:21 +01:00
proc	x86 / CPU: Always show current CPU frequency in /proc/cpuinfo	2018-01-10 09:31:20 +01:00
pstore	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
qnx4	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
qnx6	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
quota	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ramfs
reiserfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
romfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
squashfs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
sysfs
sysv	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
tracefs
ubifs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
udf	udf: Avoid overflow when session starts at large offset	2017-12-20 10:10:36 +01:00
ufs	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
xfs	xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real	2017-12-20 10:10:32 +01:00
aio.c	Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 19:29:55 -07:00
anon_inodes.c
attr.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
bad_inode.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
binfmt_aout.c
binfmt_elf.c	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 18:13:32 -07:00
binfmt_elf_fdpic.c	Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 18:13:32 -07:00
binfmt_em86.c
binfmt_flat.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
binfmt_misc.c	fs/binfmt_misc.c: node could be NULL when evicting inode	2017-10-13 16:18:33 -07:00
binfmt_script.c	exec: load_script: kill the onstack interp[BINPRM_BUF_SIZE] array	2017-10-03 17:54:25 -07:00
block_dev.c	fs/mpage.c: fix mpage_writepage() for pages with buffers	2017-10-13 16:18:33 -07:00
buffer.c	fs: guard_bio_eod() needs to consider partitions	2017-11-30 08:40:45 +00:00
char_dev.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
compat.c
compat_binfmt_elf.c
compat_ioctl.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
coredump.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
dax.c	dax: fix PMD faults on zero-length files	2017-11-30 08:40:53 +00:00
dcache.c	locking/barriers: Convert users of lockless_dereference() to READ_ONCE()	2017-12-25 14:26:21 +01:00
dcookies.c
direct-io.c	Changes since last update:	2017-10-18 14:51:50 -04:00
drop_caches.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
eventfd.c
eventpoll.c	fs/epoll: use faster rb_first_cached()	2017-09-08 18:26:49 -07:00
exec.c	exec: Weaken dumpability for secureexec	2018-01-05 15:48:57 +01:00
fcntl.c	fcntl: don't cap l_start and l_end values for F_GETLK64 in compat syscall	2017-12-17 15:07:59 +01:00
fhandle.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
file.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
file_table.c
filesystems.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fs-writeback.c
fs_pin.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fs_struct.c
inode.c	Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs	2017-09-13 09:11:44 -07:00
internal.h	Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs	2017-09-13 09:11:44 -07:00
ioctl.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
iomap.c	fs: invalidate page cache after end_io() in dio completion	2017-10-16 12:11:56 -07:00
Kconfig
Kconfig.binfmt
libfs.c
locks.c
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mbcache.c
mount.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mpage.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
namei.c	autofs: revert "autofs: fix AT_NO_AUTOMOUNT not being honored"	2017-12-05 11:26:29 +01:00
namespace.c	vfs: fix mounting a filesystem with i_version	2017-10-17 02:22:07 -04:00
no-block.c
nsfs.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
open.c
pipe.c	pipe: match pipe_max_size data type with procfs	2017-12-14 09:53:08 +01:00
pnode.c
pnode.h
posix_acl.c
proc_namespace.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
read_write.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
readdir.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
select.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
seq_file.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
signalfd.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
splice.c
stack.c
stat.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
statfs.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
super.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
sync.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
timerfd.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
userfaultfd.c	userfaultfd: clear the vma->vm_userfaultfd_ctx if UFFD_EVENT_FORK fails	2018-01-10 09:31:17 +01:00
utimes.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
xattr.c	lsm: fix smack_inode_removexattr and xattr_getsecurity memleak	2017-10-04 18:03:15 +11:00