linux-toradex.git/include/uapi/linux/perf_event.h, branch v3.19-rc5

perf: Add ability to sample machine state on interrupt

2014-11-16T10:41:57+00:00

Enable capture of interrupted machine state for each sample.

Registers to sample are passed per event in the sample_regs_intr bitmask.

To sample interrupt machine state, the PERF_SAMPLE_INTR_REGS must be passed in
sample_type.

The list of available registers is arch dependent and provided by asm/perf_regs.h

Registers are laid out as u64 in the order of the bit order of sample_intr_regs.

This patch also adds a new ABI version PERF_ATTR_SIZE_VER4 because we extend
the perf_event_attr struct with a new u64 field.

Reviewed-by: Jiri Olsa 
Signed-off-by: Stephane Eranian 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: cebbert.lkml@gmail.com
Cc: Arnaldo Carvalho de Melo 
Cc: Linus Torvalds 
Cc: linux-api@vger.kernel.org
Link: http://lkml.kernel.org/r/1411559322-16548-2-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar

perf: Fix typos in sample code in the perf_event.h header

2014-10-28T09:51:02+00:00

struct perf_event_mmap_page has members called "index" and
"cap_user_rdpmc".  Spell them correctly in the examples.

Signed-off-by: Andy Lutomirski 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Arnaldo Carvalho de Melo 
Cc: Linus Torvalds 
Cc: linux-api@vger.kernel.org
Link: http://lkml.kernel.org/r/320ba26391a8123cc16e5f02d24d34bd404332fd.1412313343.git.luto@amacapital.net
Signed-off-by: Ingo Molnar

perf: Pass protection and flags bits through mmap2 interface

2014-06-09T10:21:04+00:00

The mmap2 interface was missing the protection and flags bits needed to
accurately determine if a mmap memory area was shared or private and
if it was readable or not.

Signed-off-by: Peter Zijlstra 
[tweaked patch to compile and wrote changelog]
Signed-off-by: Don Zickus 
Link: http://lkml.kernel.org/r/1400526833-141779-2-git-send-email-dzickus@redhat.com
Signed-off-by: Jiri Olsa

perf: Differentiate exec() and non-exec() comm events

2014-06-06T05:56:22+00:00

perf tools like 'perf report' can aggregate samples by comm strings,
which generally works.  However, there are other potential use-cases.
For example, to pair up 'calls' with 'returns' accurately (from branch
events like Intel BTS) it is necessary to identify whether the process
has exec'd.  Although a comm event is generated when an 'exec' happens
it is also generated whenever the comm string is changed on a whim
(e.g. by prctl PR_SET_NAME).  This patch adds a flag to the comm event
to differentiate one case from the other.

In order to determine whether the kernel supports the new flag, a
selection bit named 'exec' is added to struct perf_event_attr.  The
bit does nothing but will cause perf_event_open() to fail if the bit
is set on kernels that do not have it defined.

Signed-off-by: Adrian Hunter 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/537D9EBE.7030806@intel.com
Cc: Paul Mackerras 
Cc: Dave Jones 
Cc: Arnaldo Carvalho de Melo 
Cc: David Ahern 
Cc: Jiri Olsa 
Cc: Alexander Viro 
Cc: Linus Torvalds 
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

perf: Add new conditional branch filter 'PERF_SAMPLE_BRANCH_COND'

2014-06-05T10:30:15+00:00

This patch introduces new branch filter PERF_SAMPLE_BRANCH_COND which
will extend the existing perf ABI. This will filter branches which are
conditional. Various architectures can provide this functionality either
with HW filtering support (if present) or with SW filtering of captured
branch instructions.

Signed-off-by: Anshuman Khandual 
Reviewed-by: Stephane Eranian 
Reviewed-by: Andi Kleen 
Signed-off-by: Peter Zijlstra 
Cc: mpe@ellerman.id.au
Cc: benh@kernel.crashing.org
Cc: Arnaldo Carvalho de Melo 
Cc: Linus Torvalds 
Link: http://lkml.kernel.org/r/1400743210-32289-1-git-send-email-khandual@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar

perf: Fix perf_event_open(.flags) test

2014-05-19T12:52:59+00:00

Vince noticed that we test the (unsigned long) flags field against an
(unsigned int) constant. This would allow setting the high bits on 64bit
platforms and not get an error.

There is nothing that uses the high bits, so it should be entirely
harmless, but we don't want userspace to accidentally set them anyway,
so fix the constants.

Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Reported-by: Vince Weaver 
Tested-by: Vince Weaver 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20140423102254.GL11096@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner

uapi: convert u64 to __u64 in exported headers

2014-01-24T00:36:55+00:00

The u64 type is not defined in any exported kernel headers, so trying to
use it will lead to build failures.

Signed-off-by: Mike Frysinger 
Acked-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'perf/urgent' into perf/core

2014-01-16T08:33:30+00:00

Pick up the latest fixes, refresh the development tree.

Signed-off-by: Ingo Molnar

perf: Introduce a flag to enable close-on-exec in perf_event_open()

2014-01-12T09:16:59+00:00

Unlike recent modern userspace API such as:

  epoll_create1 (EPOLL_CLOEXEC), eventfd (EFD_CLOEXEC),
  fanotify_init (FAN_CLOEXEC), inotify_init1 (IN_CLOEXEC),
  signalfd (SFD_CLOEXEC), timerfd_create (TFD_CLOEXEC),
  or the venerable general purpose open (O_CLOEXEC),

perf_event_open() syscall lack a flag to atomically set FD_CLOEXEC
(eg. close-on-exec) flag on file descriptor it returns to userspace.

The present patch adds a PERF_FLAG_FD_CLOEXEC flag to allow
perf_event_open() syscall to atomically set close-on-exec.

Having this flag will enable userspace to remove the file descriptor
from the list of file descriptors being inherited across exec,
without the need to call fcntl(fd, F_SETFD, FD_CLOEXEC) and the
associated race condition between the current thread and another
thread calling fork(2) then execve(2).

Links:

 - Secure File Descriptor Handling (Ulrich Drepper, 2008)
   http://udrepper.livejournal.com/20407.html

 - Excuse me son, but your code is leaking !!! (Dan Walsh, March 2012)
   http://danwalsh.livejournal.com/53603.html

 - Notes in DMA buffer sharing: leak and security hole
   http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/dma-buf-sharing.txt?id=v3.13-rc3#n428

Signed-off-by: Yann Droneaud 
Cc: Arnaldo Carvalho de Melo 
Cc: Al Viro 
Cc: Andrew Morton 
Cc: Paul Mackerras 
Cc: Linus Torvalds 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/8c03f54e1598b1727c19706f3af03f98685d9fe6.1388952061.git.ydroneaud@opteya.com
Signed-off-by: Ingo Molnar

perf: Document the new transaction sample type

2013-12-17T14:04:01+00:00

Commit fdfbbd07e91f8fe3871 ("perf: Add generic transaction flags")
added support for PERF_SAMPLE_TRANSACTION but forgot to add documentation
for the sample type to include/uapi/linux/perf_event.h

Signed-off-by: Vince Weaver 
Signed-off-by: Peter Zijlstra 
Cc: Andi Kleen 
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1312131548450.10372@pianoman.cluster.toy
Signed-off-by: Ingo Molnar