linux-toradex.git/kernel/time/timer_list.c, branch v2.6.32.52

hrtimer: Tune hrtimer_interrupt hang logic

2010-04-01T22:58:14+00:00

commit 41d2e494937715d3150e5c75d01f0e75ae899337 upstream.

The hrtimer_interrupt hang logic adjusts min_delta_ns based on the
execution time of the hrtimer callbacks.

This is error-prone for virtual machines, where a guest vcpu can be
scheduled out during the execution of the callbacks (and the callbacks
themselves can do operations that translate to blocking operations in
the hypervisor), which in can lead to large min_delta_ns rendering the
system unusable.

Replace the current heuristics with something more reliable. Allow the
interrupt code to try 3 times to catch up with the lost time. If that
fails use the total time spent in the interrupt handler to defer the
next timer interrupt so the system can catch up with other things
which got delayed. Limit that deferment to 100ms.

The retry events and the maximum time spent in the interrupt handler
are recorded and exposed via /proc/timer_list

Inspired by a patch from Marcelo.

Reported-by: Michael Tokarev 
Signed-off-by: Thomas Gleixner 
Tested-by: Marcelo Tosatti 
Cc: kvm@vger.kernel.org
Cc: Jeremy Fitzhardinge 
Signed-off-by: Greg Kroah-Hartman

const: constify remaining file_operations

2009-10-01T23:11:11+00:00

[akpm@linux-foundation.org: fix KVM]
Signed-off-by: Alexey Dobriyan 
Acked-by: Mike Frysinger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

timers: Drop write permission on /proc/timer_list

2009-08-17T09:47:31+00:00

/proc/timer_list and /proc/slabinfo are not supposed to be
written, so there should be no write permissions on it.

Signed-off-by: WANG Cong 
Cc: Pekka Enberg 
Cc: Vegard Nossum 
Cc: Eduard - Gabriel Munteanu 
Cc: linux-mm@kvack.org
Cc: Christoph Lameter 
Cc: David Rientjes 
Cc: Amerigo Wang 
Cc: Matt Mackall 
Cc: Arjan van de Ven 
LKML-Reference: <20090817094525.6355.88682.sendpatchset@localhost.localdomain>
Signed-off-by: Ingo Molnar

Merge branch 'timers/range-hrtimers' into v28-range-hrtimers-for-linus-v2

2008-10-22T07:48:06+00:00

Conflicts:

	kernel/time/tick-sched.c

Signed-off-by: Thomas Gleixner

timer_list: add base address to clock base

2008-10-20T09:51:30+00:00

The base address of a (per cpu) clock base is a useful debug info.
Add it and bump the version number of timer_lists.

Signed-off-by: Thomas Gleixner

timer_list: print cpu number of clockevents device

2008-10-20T09:51:30+00:00

The per cpu clock events device output of timer_list lacks an
association of the device to the cpu which is annoying when looking at
the output of /proc/timer_list from a 128 way system. 

Add the CPU number info and mark the broadcast device in the device
list printout.

Signed-off-by: Thomas Gleixner

timer_list: print real timer address

2008-10-20T09:51:30+00:00

The current timer_list output prints the address of the on stack copy
of the active hrtimer instead of the hrtimer itself.

Print the address of the real timer instead.

Signed-off-by: Thomas Gleixner

hrtimer: show the timer ranges in /proc/timer_list

2008-09-07T23:10:20+00:00

to help debugging and visibility of timer ranges, show them
in the existing timer list in /proc/timer_list

Signed-off-by: Arjan van de Ven

hrtimer: convert kernel/* to the new hrtimer apis

2008-09-06T04:35:13+00:00

In order to be able to do range hrtimers we need to use accessor functions
to the "expire" member of the hrtimer struct.
This patch converts kernel/* to these accessors.

Signed-off-by: Arjan van de Ven

kernel: use non-racy method for proc entries creation

2008-04-29T15:06:22+00:00

Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
be setup before gluing PDE to main tree.

Signed-off-by: Denis V. Lunev 
Cc: Alexey Dobriyan 
Cc: "Eric W. Biederman" 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds