License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 21:07:57 +07:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0 */
|
2007-07-09 23:51:58 +07:00
|
|
|
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
2008-10-06 16:23:43 +07:00
|
|
|
|
2007-07-09 23:51:58 +07:00
|
|
|
/*
|
|
|
|
* Expects runqueue lock to be held for atomicity of update
|
|
|
|
*/
|
|
|
|
static inline void
|
|
|
|
rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
|
|
|
|
{
|
|
|
|
if (rq) {
|
|
|
|
rq->rq_sched_info.run_delay += delta;
|
2007-10-15 22:00:12 +07:00
|
|
|
rq->rq_sched_info.pcount++;
|
2007-07-09 23:51:58 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Expects runqueue lock to be held for atomicity of update
|
|
|
|
*/
|
|
|
|
static inline void
|
|
|
|
rq_sched_info_depart(struct rq *rq, unsigned long long delta)
|
|
|
|
{
|
|
|
|
if (rq)
|
2008-12-17 14:41:22 +07:00
|
|
|
rq->rq_cpu_time += delta;
|
2007-07-09 23:51:58 +07:00
|
|
|
}
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
|
|
|
|
static inline void
|
|
|
|
rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
|
|
|
|
{
|
|
|
|
if (rq)
|
|
|
|
rq->rq_sched_info.run_delay += delta;
|
|
|
|
}
|
2016-06-18 00:43:24 +07:00
|
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#define schedstat_enabled() static_branch_unlikely(&sched_schedstats)
|
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|
#define schedstat_inc(var) do { if (schedstat_enabled()) { var++; } } while (0)
|
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|
|
#define schedstat_add(var, amt) do { if (schedstat_enabled()) { var += (amt); } } while (0)
|
|
|
|
#define schedstat_set(var, val) do { if (schedstat_enabled()) { var = (val); } } while (0)
|
2016-06-18 00:43:25 +07:00
|
|
|
#define schedstat_val(var) (var)
|
|
|
|
#define schedstat_val_or_zero(var) ((schedstat_enabled()) ? (var) : 0)
|
2016-06-04 05:58:40 +07:00
|
|
|
|
2007-07-09 23:51:58 +07:00
|
|
|
#else /* !CONFIG_SCHEDSTATS */
|
|
|
|
static inline void
|
|
|
|
rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
|
|
|
|
{}
|
|
|
|
static inline void
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
|
|
|
|
{}
|
|
|
|
static inline void
|
2007-07-09 23:51:58 +07:00
|
|
|
rq_sched_info_depart(struct rq *rq, unsigned long long delta)
|
|
|
|
{}
|
2016-06-18 00:43:24 +07:00
|
|
|
#define schedstat_enabled() 0
|
|
|
|
#define schedstat_inc(var) do { } while (0)
|
|
|
|
#define schedstat_add(var, amt) do { } while (0)
|
|
|
|
#define schedstat_set(var, val) do { } while (0)
|
|
|
|
#define schedstat_val(var) 0
|
2016-06-18 00:43:25 +07:00
|
|
|
#define schedstat_val_or_zero(var) 0
|
2016-06-18 00:43:24 +07:00
|
|
|
#endif /* CONFIG_SCHEDSTATS */
|
2007-07-09 23:51:58 +07:00
|
|
|
|
2015-06-26 01:23:37 +07:00
|
|
|
#ifdef CONFIG_SCHED_INFO
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
static inline void sched_info_reset_dequeued(struct task_struct *t)
|
|
|
|
{
|
|
|
|
t->sched_info.last_queued = 0;
|
|
|
|
}
|
|
|
|
|
2007-07-09 23:51:58 +07:00
|
|
|
/*
|
2010-10-24 17:28:47 +07:00
|
|
|
* We are interested in knowing how long it was from the *first* time a
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
* task was queued to the time that it finally hit a cpu, we call this routine
|
|
|
|
* from dequeue_task() to account for possible rq->clock skew across cpus. The
|
|
|
|
* delta taken on each cpu would annul the skew.
|
2007-07-09 23:51:58 +07:00
|
|
|
*/
|
2013-09-22 21:20:54 +07:00
|
|
|
static inline void sched_info_dequeued(struct rq *rq, struct task_struct *t)
|
2007-07-09 23:51:58 +07:00
|
|
|
{
|
2013-09-22 21:20:54 +07:00
|
|
|
unsigned long long now = rq_clock(rq), delta = 0;
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
|
|
|
|
if (unlikely(sched_info_on()))
|
|
|
|
if (t->sched_info.last_queued)
|
|
|
|
delta = now - t->sched_info.last_queued;
|
|
|
|
sched_info_reset_dequeued(t);
|
|
|
|
t->sched_info.run_delay += delta;
|
|
|
|
|
2013-09-22 21:20:54 +07:00
|
|
|
rq_sched_info_dequeued(rq, delta);
|
2007-07-09 23:51:58 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called when a task finally hits the cpu. We can now calculate how
|
|
|
|
* long it was waiting to run. We also note when it began so that we
|
|
|
|
* can keep stats on how long its timeslice is.
|
|
|
|
*/
|
2013-09-22 21:20:54 +07:00
|
|
|
static void sched_info_arrive(struct rq *rq, struct task_struct *t)
|
2007-07-09 23:51:58 +07:00
|
|
|
{
|
2013-09-22 21:20:54 +07:00
|
|
|
unsigned long long now = rq_clock(rq), delta = 0;
|
2007-07-09 23:51:58 +07:00
|
|
|
|
|
|
|
if (t->sched_info.last_queued)
|
|
|
|
delta = now - t->sched_info.last_queued;
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
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sched_info_reset_dequeued(t);
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2007-07-09 23:51:58 +07:00
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t->sched_info.run_delay += delta;
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t->sched_info.last_arrival = now;
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2007-10-15 22:00:12 +07:00
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t->sched_info.pcount++;
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2007-07-09 23:51:58 +07:00
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2013-09-22 21:20:54 +07:00
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rq_sched_info_arrive(rq, delta);
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2007-07-09 23:51:58 +07:00
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}
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/*
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* This function is only called from enqueue_task(), but also only updates
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* the timestamp if it is already not set. It's assumed that
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* sched_info_dequeued() will clear that stamp when appropriate.
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*/
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2013-09-22 21:20:54 +07:00
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static inline void sched_info_queued(struct rq *rq, struct task_struct *t)
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2007-07-09 23:51:58 +07:00
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{
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if (unlikely(sched_info_on()))
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if (!t->sched_info.last_queued)
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2013-09-22 21:20:54 +07:00
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t->sched_info.last_queued = rq_clock(rq);
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2007-07-09 23:51:58 +07:00
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}
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/*
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2013-09-16 15:30:36 +07:00
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* Called when a process ceases being the active-running process involuntarily
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* due, typically, to expiring its time slice (this may also be called when
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* switching to the idle task). Now we can calculate how long we ran.
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2008-06-16 16:41:01 +07:00
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* Also, if the process is still in the TASK_RUNNING state, call
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* sched_info_queued() to mark that it has now again started waiting on
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* the runqueue.
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2007-07-09 23:51:58 +07:00
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*/
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2013-09-22 21:20:54 +07:00
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static inline void sched_info_depart(struct rq *rq, struct task_struct *t)
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2007-07-09 23:51:58 +07:00
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{
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2013-09-22 21:20:54 +07:00
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unsigned long long delta = rq_clock(rq) -
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2007-11-10 04:39:37 +07:00
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t->sched_info.last_arrival;
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2007-07-09 23:51:58 +07:00
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2013-09-22 21:20:54 +07:00
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rq_sched_info_depart(rq, delta);
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2008-06-16 16:41:01 +07:00
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if (t->state == TASK_RUNNING)
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2013-09-22 21:20:54 +07:00
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sched_info_queued(rq, t);
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2007-07-09 23:51:58 +07:00
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}
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/*
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* Called when tasks are switched involuntarily due, typically, to expiring
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* their time slice. (This may also be called when switching to or from
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* the idle task.) We are only called when prev != next.
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*/
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static inline void
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2013-09-22 21:20:54 +07:00
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__sched_info_switch(struct rq *rq,
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struct task_struct *prev, struct task_struct *next)
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2007-07-09 23:51:58 +07:00
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{
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/*
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* prev now departs the cpu. It's not interesting to record
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* stats about how efficient we were at scheduling the idle
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* process, however.
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*/
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if (prev != rq->idle)
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2013-09-22 21:20:54 +07:00
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sched_info_depart(rq, prev);
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2007-07-09 23:51:58 +07:00
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if (next != rq->idle)
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2013-09-22 21:20:54 +07:00
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sched_info_arrive(rq, next);
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2007-07-09 23:51:58 +07:00
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}
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static inline void
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2013-09-22 21:20:54 +07:00
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sched_info_switch(struct rq *rq,
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struct task_struct *prev, struct task_struct *next)
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2007-07-09 23:51:58 +07:00
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{
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if (unlikely(sched_info_on()))
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2013-09-22 21:20:54 +07:00
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__sched_info_switch(rq, prev, next);
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2007-07-09 23:51:58 +07:00
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}
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#else
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2013-09-22 21:20:54 +07:00
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#define sched_info_queued(rq, t) do { } while (0)
|
sched: fix accounting in task delay accounting & migration
On Thu, Jun 19, 2008 at 12:27:14PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-05 at 10:50 +0530, Ankita Garg wrote:
>
> > Thanks Peter for the explanation...
> >
> > I agree with the above and that is the reason why I did not see weird
> > values with cpu_time. But, run_delay still would suffer skews as the end
> > points for delta could be taken on different cpus due to migration (more
> > so on RT kernel due to the push-pull operations). With the below patch,
> > I could not reproduce the issue I had seen earlier. After every dequeue,
> > we take the delta and start wait measurements from zero when moved to a
> > different rq.
>
> OK, so task delay delay accounting is broken because it doesn't take
> migration into account.
>
> What you've done is make it symmetric wrt enqueue, and account it like
>
> cpu0 cpu1
>
> enqueue
> <wait-d1>
> dequeue
> enqueue
> <wait-d2>
> run
>
> Where you add both d1 and d2 to the run_delay,.. right?
>
Thanks for reviewing the patch. The above is exactly what I have done.
> This seems like a good fix, however it looks like the patch will break
> compilation in !CONFIG_SCHEDSTATS && !CONFIG_TASK_DELAY_ACCT, of it
> failing to provide a stub for sched_info_dequeue() in that case.
Fixed. Pl. find the new patch below.
Signed-off-by: Ankita Garg <ankita@in.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gregory Haskins <ghaskins@novell.com>
Cc: rostedt@goodmis.org
Cc: suresh.b.siddha@intel.com
Cc: aneesh.kumar@linux.vnet.ibm.com
Cc: dhaval@linux.vnet.ibm.com
Cc: vatsa@linux.vnet.ibm.com
Cc: David Bahi <DBahi@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-01 16:00:06 +07:00
|
|
|
#define sched_info_reset_dequeued(t) do { } while (0)
|
2013-09-22 21:20:54 +07:00
|
|
|
#define sched_info_dequeued(rq, t) do { } while (0)
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|
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#define sched_info_depart(rq, t) do { } while (0)
|
|
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#define sched_info_arrive(rq, next) do { } while (0)
|
|
|
|
#define sched_info_switch(rq, t, next) do { } while (0)
|
2015-06-26 01:23:37 +07:00
|
|
|
#endif /* CONFIG_SCHED_INFO */
|