linux-toradex.git/kernel/delayacct.c, branch v4.6-rc3

kmemcg: account certain kmem allocations to memcg

2016-01-15T00:00:49+00:00

Mark those kmem allocations that are known to be easily triggered from
userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to
memcg.  For the list, see below:

 - threadinfo
 - task_struct
 - task_delay_info
 - pid
 - cred
 - mm_struct
 - vm_area_struct and vm_region (nommu)
 - anon_vma and anon_vma_chain
 - signal_struct
 - sighand_struct
 - fs_struct
 - files_struct
 - fdtable and fdtable->full_fds_bits
 - dentry and external_name
 - inode for all filesystems. This is the most tedious part, because
   most filesystems overwrite the alloc_inode method.

The list is far from complete, so feel free to add more objects.
Nevertheless, it should be close to "account everything" approach and
keep most workloads within bounds.  Malevolent users will be able to
breach the limit, but this was possible even with the former "account
everything" approach (simply because it did not account everything in
fact).

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Vladimir Davydov 
Acked-by: Johannes Weiner 
Acked-by: Michal Hocko 
Cc: Tejun Heo 
Cc: Greg Thelen 
Cc: Christoph Lameter 
Cc: Pekka Enberg 
Cc: David Rientjes 
Cc: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

delayacct: Remove braindamaged type conversions

2014-07-23T17:18:06+00:00

Converting cputime to timespec and timespec to nanoseconds makes no
sense. Use cputime_to_ns() and be done with it.

Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

delayacct: Make accounting nanosecond based

2014-07-23T17:18:06+00:00

Kill the timespec juggling and calculate with plain nanoseconds.

Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

delayacct: Use ktime_get_ts()

2014-06-12T14:18:45+00:00

do_posix_clock_monotonic_gettime() is a leftover from the initial
posix timer implementation which maps to ktime_get_ts(). Remove the
silly wrapper while at it.

Signed-off-by: Thomas Gleixner 
Cc: John Stultz 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20140611234606.931409215@linutronix.de
Signed-off-by: Thomas Gleixner

kernel/delayacct.c: remove redundant checking in __delayacct_add_tsk()

2013-11-13T03:09:12+00:00

The wrapper function delayacct_add_tsk() already checked 'tsk->delays',
and __delayacct_add_tsk() has no another direct callers, so can remove the
redundancy checking code.

And the label 'done' is also useless, so remove it, too.

Signed-off-by: Chen Gang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cputime: Use accessors to read task cputime stats

2013-01-27T18:23:31+00:00

This is in preparation for the full dynticks feature. While
remotely reading the cputime of a task running in a full
dynticks CPU, we'll need to do some extra-computation. This
way we can account the time it spent tickless in userspace
since its last cputime snapshot.

Signed-off-by: Frederic Weisbecker 
Cc: Andrew Morton 
Cc: Ingo Molnar 
Cc: Li Zhong 
Cc: Namhyung Kim 
Cc: Paul E. McKenney 
Cc: Paul Gortmaker 
Cc: Peter Zijlstra 
Cc: Steven Rostedt 
Cc: Thomas Gleixner

KVM: Steal time implementation

2011-07-14T09:59:14+00:00

To implement steal time, we need the hypervisor to pass the guest
information about how much time was spent running other processes
outside the VM, while the vcpu had meaningful work to do - halt
time does not count.

This information is acquired through the run_delay field of
delayacct/schedstats infrastructure, that counts time spent in a
runqueue but not running.

Steal time is a per-cpu information, so the traditional MSR-based
infrastructure is used. A new msr, KVM_MSR_STEAL_TIME, holds the
memory area address containing information about steal time

This patch contains the hypervisor part of the steal time infrasructure,
and can be backported independently of the guest portion.

[avi, yongjie: export delayacct_on, to avoid build failures in some configs]

Signed-off-by: Glauber Costa 
Tested-by: Eric B Munson 
CC: Rik van Riel 
CC: Jeremy Fitzhardinge 
CC: Peter Zijlstra 
CC: Anthony Liguori 
Signed-off-by: Yongjie Ren 
Signed-off-by: Avi Kivity

headers: taskstats_kern.h trim

2009-09-18T16:48:52+00:00

Remove net/genetlink.h inclusion, now sched.c won't be recompiled
because of some networking changes.

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Linus Torvalds

schedstat: consolidate per-task cpu runtime stats

2008-12-18T12:54:01+00:00

Impact: simplify code

When we turn on CONFIG_SCHEDSTATS, per-task cpu runtime is accumulated
twice. Once in task->se.sum_exec_runtime and once in sched_info.cpu_time.
These two stats are exactly the same.

Given that task->se.sum_exec_runtime is always accumulated by the core
scheduler, sched_info can reuse that data instead of duplicate the accounting.

Signed-off-by: Ken Chen 
Acked-by: Peter Zijlstra 
Signed-off-by: Ingo Molnar

per-task-delay-accounting: update taskstats for memory reclaim delay

2008-07-25T17:53:47+00:00

Add members for memory reclaim delay to taskstats, and accumulate them in
__delayacct_add_tsk() .

Signed-off-by: Keika Kobayashi 
Cc: Hiroshi Shimamoto 
Cc: Balbir Singh 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds