linux-toradex.git/fs/proc/uptime.c, branch v4.2.1

cputime: Default implementation of nsecs -> cputime conversion

2014-03-13T14:56:43+00:00

The architectures that override cputime_t (s390, ppc) don't provide
any version of nsecs_to_cputime(). Indeed this cputime_t implementation
by backend only happens when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y under
which the core code doesn't make any use of nsecs_to_cputime().

At least for now.

We are going to make a broader use of it so lets provide a default
version with a per usecs granularity. It should be good enough for most
usecases.

Cc: Ingo Molnar 
Cc: Marcelo Tosatti 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Acked-by: Rik van Riel 
Signed-off-by: Frederic Weisbecker

fs/proc: don't use module_init for non-modular core code

2014-01-24T00:37:02+00:00

PROC_FS is a bool, so this code is either present or absent.  It will
never be modular, so using module_init as an alias for __initcall is
rather misleading.

Fix this up now, so that we can relocate module_init from init.h into
module.h in the future.  If we don't do this, we'd have to add module.h to
obviously non-modular code, and that would be ugly at best.

Note that direct use of __initcall is discouraged, vs.  one of the
priority categorized subgroups.  As __initcall gets mapped onto
device_initcall, our use of fs_initcall (which makes sense for fs code)
will thus change these registrations from level 6-device to level 5-fs
(i.e.  slightly earlier).  However no observable impact of that small
difference has been observed during testing, or is expected.

Also note that this change uncovers a missing semicolon bug in the
registration of vmcore_init as an initcall.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/proc/uptime.c:uptime_proc_show(): use get_monotonic_boottime()

2013-07-03T23:08:02+00:00

Change uptime_proc_show() to use get_monotonic_boottime() instead of
do_posix_clock_monotonic_gettime() + monotonic_to_bootbased().

Signed-off-by: Oleg Nesterov 
Cc: "Eric W. Biederman" 
Acked-by: John Stultz 
Cc: Tomas Janousek 
Cc: Tomas Smetana 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip

2011-12-19T18:23:15+00:00

Conflicts:
	drivers/cpufreq/cpufreq_conservative.c
	drivers/cpufreq/cpufreq_ondemand.c
	drivers/macintosh/rack-meter.c
	fs/proc/stat.c
	fs/proc/uptime.c
	kernel/sched/core.c

[S390] fix cputime overflow in uptime_proc_show

2011-12-15T13:56:19+00:00

For 32-bit architectures using standard jiffies the idletime calculation
in uptime_proc_show will quickly overflow. It takes (2^32 / HZ) seconds
of idle-time, or e.g. 12.45 days with no load on a quad-core with HZ=1000.
Switch to 64-bit calculations.

Cc: stable@vger.kernel.org
Cc: Michael Abbott 
Signed-off-by: Martin Schwidefsky

[S390] cputime: add sparse checking and cleanup

2011-12-15T13:56:19+00:00

Make cputime_t and cputime64_t nocast to enable sparse checking to
detect incorrect use of cputime. Drop the cputime macros for simple
scalar operations. The conversion macros are still needed.

Signed-off-by: Martin Schwidefsky

sched/accounting: Change cpustat fields to an array

2011-12-06T08:06:38+00:00

This patch changes fields in cpustat from a structure, to an
u64 array. Math gets easier, and the code is more flexible.

Signed-off-by: Glauber Costa 
Reviewed-by: KAMEZAWA Hiroyuki 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: Paul Tuner 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1322498719-2255-2-git-send-email-glommer@parallels.com
Signed-off-by: Ingo Molnar

[PATCH] Fix idle time field in /proc/uptime

2009-09-24T08:16:24+00:00

Git commit 79741dd changes idle cputime accounting, but unfortunately
the /proc/uptime file hasn't caught up.  Here the idle time calculation
from /proc/stat is copied over.

Signed-off-by: Michael Abbott 
Signed-off-by: Martin Schwidefsky

Revert "proc: revert /proc/uptime to ->read_proc hook"

2009-03-30T21:14:58+00:00

This reverts commit 6c87df37dcb9c6c33923707fa5191e0a65874d60.

proc files implemented through seq_file do pread(2) now.

Signed-off-by: Alexey Dobriyan

proc: revert /proc/uptime to ->read_proc hook

2008-10-27T19:56:56+00:00

Turned out some VMware userspace does pread(2) on /proc/uptime, but
seqfiles currently don't allow pread() resulting in -ESPIPE.

Seqfiles in theory can do pread(), but this can be a long story,
so revert to ->read_proc until then.

http://bugzilla.kernel.org/show_bug.cgi?id=11856

Signed-off-by: Alexey Dobriyan