linux-toradex.git/arch/mips/kernel/perf_event.c, branch v6.19

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55+00:00

Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Kate Stewart 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:36+00:00

We are going to split  out of , which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder  file that just
maps to  to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

perf core: Add a 'nr' field to perf_event_callchain_context

2016-05-17T02:11:51+00:00

We will use it to count how many addresses are in the entry->ip[] array,
excluding PERF_CONTEXT_{KERNEL,USER,etc} entries, so that we can really
return the number of entries specified by the user via the relevant
sysctl, kernel.perf_event_max_contexts, or via the per event
perf_event_attr.sample_max_stack knob.

This way we keep the perf_sample->ip_callchain->nr meaning, that is the
number of entries, be it real addresses or PERF_CONTEXT_ entries, while
honouring the max_stack knobs, i.e. the end result will be max_stack
entries if we have at least that many entries in a given stack trace.

Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-s8teto51tdqvlfhefndtat9r@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf core: Pass max stack as a perf_callchain_entry context

2016-05-17T02:11:50+00:00

This makes perf_callchain_{user,kernel}() receive the max stack
as context for the perf_callchain_entry, instead of accessing
the global sysctl_perf_event_max_stack.

Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexei Starovoitov 
Cc: Brendan Gregg 
Cc: David Ahern 
Cc: Frederic Weisbecker 
Cc: He Kuang 
Cc: Jiri Olsa 
Cc: Linus Torvalds 
Cc: Masami Hiramatsu 
Cc: Milian Wolff 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: Thomas Gleixner 
Cc: Vince Weaver 
Cc: Wang Nan 
Cc: Zefan Li 
Link: http://lkml.kernel.org/n/tip-kolmn1yo40p7jhswxwrc7rrd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf core: Allow setting up max frame stack depth via sysctl

2016-04-27T13:20:39+00:00

The default remains 127, which is good for most cases, and not even hit
most of the time, but then for some cases, as reported by Brendan, 1024+
deep frames are appearing on the radar for things like groovy, ruby.

And in some workloads putting a _lower_ cap on this may make sense. One
that is per event still needs to be put in place tho.

The new file is:

  # cat /proc/sys/kernel/perf_event_max_stack
  127

Chaging it:

  # echo 256 > /proc/sys/kernel/perf_event_max_stack
  # cat /proc/sys/kernel/perf_event_max_stack
  256

But as soon as there is some event using callchains we get:

  # echo 512 > /proc/sys/kernel/perf_event_max_stack
  -bash: echo: write error: Device or resource busy
  #

Because we only allocate the callchain percpu data structures when there
is a user, which allows for changing the max easily, its just a matter
of having no callchain users at that point.

Reported-and-Tested-by: Brendan Gregg 
Reviewed-by: Frederic Weisbecker 
Acked-by: Alexei Starovoitov 
Acked-by: David Ahern 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: He Kuang 
Cc: Jiri Olsa 
Cc: Linus Torvalds 
Cc: Masami Hiramatsu 
Cc: Milian Wolff 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: Thomas Gleixner 
Cc: Vince Weaver 
Cc: Wang Nan 
Cc: Zefan Li 
Link: http://lkml.kernel.org/r/20160426002928.GB16708@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

MIPS: perf: Reorganize contents of perf support files.

2011-10-24T22:34:26+00:00

The contents of arch/mips/kernel/perf_event.c and
arch/mips/kernel/perf_event_mipsxx.c were divided in a seemingly ad
hoc manner, with the first including the second.

I moved all the hardware counter support code to perf_event_mipsxx.c
and removed the gating #ifdefs to the Kconfig and Makefile.

Now perf_event.c contains only the callchain support, everything else
is in perf_event_mipsxx.c

There are no code changes, only moving of functions from one file to
the other, or removing empty unneeded functions.

Signed-off-by: David Daney 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Ingo Molnar 
Cc: Arnaldo Carvalho de Melo 
Cc: Dezhong Diao 
Cc: Gabor Juhos 
Cc: Deng-Cheng Zhu 
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2791/
Signed-off-by: Ralf Baechle

MIPS: perf: Cleanup formatting in arch/mips/kernel/perf_event.c

2011-10-24T22:34:26+00:00

Get rid of a bunch of useless inline declarations, and join a bunch of
improperly split lines.

Signed-off-by: David Daney 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Ingo Molnar 
Cc: Arnaldo Carvalho de Melo 
Cc: Deng-Cheng Zhu 
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2793/
Signed-off-by: Ralf Baechle

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus

2011-07-26T21:17:28+00:00

* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (31 commits)
  MIPS: Close races in TLB modify handlers.
  MIPS: Add uasm UASM_i_SRL_SAFE macro.
  MIPS: RB532: Use hex_to_bin()
  MIPS: Enable cpu_has_clo_clz for MIPS Technologies' platforms
  MIPS: PowerTV: Provide cpu-feature-overrides.h
  MIPS: Remove pointless return statement from empty void functions.
  MIPS: Limit fixrange_init() to the FIXMAP region
  MIPS: Install handlers for software IRQs
  MIPS: Move FIXADDR_TOP into spaces.h
  MIPS: Add SYNC after cacheflush
  MIPS: pfn_valid() is broken on low memory HIGHMEM systems
  MIPS: HIGHMEM DMA on noncoherent MIPS32 processors
  MIPS: topdown mmap support
  MIPS: Remove redundant addr_limit assignment on exec.
  MIPS: AR7: Replace __attribute__((__packed__)) with __packed
  MIPS: AR7: Remove 'space before tabs' in platform.c
  MIPS: Lantiq: Add missing clk_enable and clk_disable functions.
  MIPS: AR7: Fix trailing semicolon bug in clock.c
  MAINTAINERS: Update MIPS entry.
  MIPS: BCM63xx: Remove duplicate PERF_IRQSTAT_REG definition
  ...

MIPS: Remove pointless return statement from empty void functions.

2011-07-25T16:26:55+00:00

Signed-off-by: Ralf Baechle 
To: Sergei Shtylyov 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2391/
Signed-off-by: Ralf Baechle

perf: Remove the nmi parameter from the swevent and overflow interface

2011-07-01T09:06:35+00:00

The nmi parameter indicated if we could do wakeups from the current
context, if not, we would set some state and self-IPI and let the
resulting interrupt do the wakeup.

For the various event classes:

  - hardware: nmi=0; PMI is in fact an NMI or we run irq_work_run from
    the PMI-tail (ARM etc.)
  - tracepoint: nmi=0; since tracepoint could be from NMI context.
  - software: nmi=[0,1]; some, like the schedule thing cannot
    perform wakeups, and hence need 0.

As one can see, there is very little nmi=1 usage, and the down-side of
not using it is that on some platforms some software events can have a
jiffy delay in wakeup (when arch_irq_work_raise isn't implemented).

The up-side however is that we can remove the nmi parameter and save a
bunch of conditionals in fast paths.

Signed-off-by: Peter Zijlstra 
Cc: Michael Cree 
Cc: Will Deacon 
Cc: Deng-Cheng Zhu 
Cc: Anton Blanchard 
Cc: Eric B Munson 
Cc: Heiko Carstens 
Cc: Paul Mundt 
Cc: David S. Miller 
Cc: Frederic Weisbecker 
Cc: Jason Wessel 
Cc: Don Zickus 
Link: http://lkml.kernel.org/n/tip-agjev8eu666tvknpb3iaj0fg@git.kernel.org
Signed-off-by: Ingo Molnar