linux-toradex.git/arch/x86/kernel/cpu/perf_event.c, branch v3.2

perf/x86: Enable raw event access to Intel offcore events

2011-11-14T12:03:44+00:00

Now that the core offcore support is fixed up (thanks Stephane) and we
have sane generic events utilizing them, re-enable the raw access to
the feature as well.

Note that it doesn't matter if you use event 0x1b7 or 0x1bb to specify
an offcore event, either one works and neither guarantees you'll end
up on a particular offcore MSR.

Based on original patch from: Vince Weaver .

Signed-off-by: Peter Zijlstra 
Cc: Vince Weaver .
Cc: Stephane Eranian 
Link: http://lkml.kernel.org/r/alpine.DEB.2.00.1108031200390.703@cl320.eecs.utk.edu
Signed-off-by: Ingo Molnar

perf: Don't use -ENOSPC for out of PMU resources

2011-11-14T12:01:24+00:00

People (Linus) objected to using -ENOSPC to signal not having enough
resources on the PMU to satisfy the request. Use -EINVAL.

Requested-by: Linus Torvalds 
Cc: Stephane Eranian 
Cc: Will Deacon 
Cc: Deng-Cheng Zhu 
Cc: David Daney 
Cc: Ralf Baechle 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-xv8geaz2zpbjhlx0svmpp28n@git.kernel.org
[ merged to newer kernel, fixed up MIPS impact ]
Signed-off-by: Ingo Molnar

x86, nmi: Wire up NMI handlers to new routines

2011-10-10T04:56:57+00:00

Just convert all the files that have an nmi handler to the new routines.
Most of it is straight forward conversion.  A couple of places needed some
tweaking like kgdb which separates the debug notifier from the nmi handler
and mce removes a call to notify_die.

[Thanks to Ying for finding out the history behind that mce call

https://lkml.org/lkml/2010/5/27/114

And Boris responding that he would like to remove that call because of it

https://lkml.org/lkml/2011/9/21/163]

The things that get converted are the registeration/unregistration routines
and the nmi handler itself has its args changed along with code removal
to check which list it is on (most are on one NMI list except for kgdb
which has both an NMI routine and an NMI Unknown routine).

Signed-off-by: Don Zickus 
Signed-off-by: Peter Zijlstra 
Acked-by: Corey Minyard 
Cc: Jason Wessel 
Cc: Andi Kleen 
Cc: Robert Richter 
Cc: Huang Ying 
Cc: Corey Minyard 
Cc: Jack Steiner 
Link: http://lkml.kernel.org/r/1317409584-23662-4-git-send-email-dzickus@redhat.com
Signed-off-by: Ingo Molnar

x86, perf: Clean up perf_event cpu code

2011-09-26T10:58:00+00:00

The CPU support for perf events on x86 was implemented via included C files
with #ifdefs.  Clean this up by creating a new header file and compiling
the vendor-specific files as needed.

Signed-off-by: Kevin Winchester 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1314747665-2090-1-git-send-email-kjwinchester@gmail.com
Signed-off-by: Ingo Molnar

Merge commit 'v3.1-rc7' into perf/core

2011-09-26T10:54:28+00:00

Merge reason: Pick up the latest upstream fixes.

Signed-off-by: Ingo Molnar

x86, perf: Check that current->mm is alive before getting user callchain

2011-08-31T13:56:31+00:00

An event may occur when an mm is already released.

I added an event in dequeue_entity() and caught a panic with
the following backtrace:

[  434.421110] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
[  434.421258] IP: [] __get_user_pages_fast+0x9c/0x120
...
[  434.421258] Call Trace:
[  434.421258]  [] copy_from_user_nmi+0x51/0xf0
[  434.421258]  [] ? sched_clock_local+0x25/0x90
[  434.421258]  [] perf_callchain_user+0x128/0x170
[  434.421258]  [] ? __perf_event_header__init_id+0xed/0x100
[  434.421258]  [] perf_prepare_sample+0x200/0x280
[  434.421258]  [] __perf_event_overflow+0x1b8/0x290
[  434.421258]  [] ? tg_shares_up+0x0/0x670
[  434.421258]  [] ? walk_tg_tree+0x6a/0xb0
[  434.421258]  [] perf_swevent_overflow+0xc4/0xf0
[  434.421258]  [] do_perf_sw_event+0x1e0/0x250
[  434.421258]  [] perf_tp_event+0x44/0x70
[  434.421258]  [] ftrace_profile_sched_block+0xdf/0x110
[  434.421258]  [] dequeue_entity+0x2ad/0x2d0
[  434.421258]  [] dequeue_task_fair+0x1c/0x60
[  434.421258]  [] dequeue_task+0x9a/0xb0
[  434.421258]  [] deactivate_task+0x42/0xe0
[  434.421258]  [] thread_return+0x191/0x808
[  434.421258]  [] ? switch_task_namespaces+0x24/0x60
[  434.421258]  [] do_exit+0x464/0x910
[  434.421258]  [] do_group_exit+0x58/0xd0
[  434.421258]  [] sys_exit_group+0x17/0x20
[  434.421258]  [] system_call_fastpath+0x16/0x1b

Signed-off-by: Andrey Vagin 
Signed-off-by: Peter Zijlstra 
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1314693156-24131-1-git-send-email-avagin@openvz.org
Signed-off-by: Ingo Molnar

perf, x86: Avoid kfree() in CPU_STARTING

2011-08-14T09:53:02+00:00

On -rt kfree() can schedule, but CPU_STARTING is before the CPU is
fully up and running. These are contradictory, so avoid it. Instead
push the kfree() to CPU_ONLINE where we're free to schedule.

Reported-by: Thomas Gleixner 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-kwd4j6ayld5thrscvaxgjquv@git.kernel.org
Signed-off-by: Ingo Molnar

x86, perf: Make copy_from_user_nmi() a library function

2011-07-21T18:41:57+00:00

copy_from_user_nmi() is used in oprofile and perf. Moving it to other
library functions like copy_from_user(). As this is x86 code for 32
and 64 bits, create a new file usercopy.c for unified code.

Signed-off-by: Robert Richter 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20110607172413.GJ20052@erda.amd.com
Signed-off-by: Ingo Molnar

perf, x86: P4 PMU - Introduce event alias feature

2011-07-14T21:25:04+00:00

Instead of hw_nmi_watchdog_set_attr() weak function
and appropriate x86_pmu::hw_watchdog_set_attr() call
we introduce even alias mechanism which allow us
to drop this routines completely and isolate quirks
of Netburst architecture inside P4 PMU code only.

The main idea remains the same though -- to allow
nmi-watchdog and perf top run simultaneously.

Note the aliasing mechanism applies to generic
PERF_COUNT_HW_CPU_CYCLES event only because arbitrary
event (say passed as RAW initially) might have some
additional bits set inside ESCR register changing
the behaviour of event and we can't guarantee anymore
that alias event will give the same result.

P.S. Thanks a huge to Don and Steven for for testing
     and early review.

Acked-by: Don Zickus 
Tested-by: Steven Rostedt 
Signed-off-by: Cyrill Gorcunov 
CC: Ingo Molnar 
CC: Peter Zijlstra 
CC: Stephane Eranian 
CC: Lin Ming 
CC: Arnaldo Carvalho de Melo 
CC: Frederic Weisbecker 
Link: http://lkml.kernel.org/r/20110708201712.GS23657@sun
Signed-off-by: Steven Rostedt

perf, intel: Try alternative OFFCORE encodings

2011-07-01T09:06:37+00:00

Since the OFFCORE registers are fully symmetric, try the other one
when the specified one is already in use.

Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1306141897.18455.8.camel@twins
Signed-off-by: Ingo Molnar