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  1. 28 6月, 2016 1 次提交
  3. 23 6月, 2016 1 次提交
  5. 22 6月, 2016 1 次提交
  7. 08 6月, 2016 2 次提交
  9. 07 6月, 2016 3 次提交
    • H
      perf tools: Export normalize_arch() function · 940e6987
      由 He Kuang 提交于 
      Export normalize_arch() function, so other part of perf can get
normalized form of arch string.
Signed-off-by: NHe Kuang <hekuang@huawei.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1464924803-22214-10-git-send-email-hekuang@huawei.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      940e6987
    • H
      perf unwind: Separate local/remote libunwind config · 9d8e14d3
      由 He Kuang 提交于 
      CONFIG_LIBUNWIND/NO_LIBUNWIND are changed to CONFIG_LOCAL_LIBUNWIND/
NO_LOCAL_LIBUNWIND for retaining local unwind features. The new
CONFIG_LIBUNWIND stands for either local or remote or both unwind are
supported, and NO_LIBUNWIND means that neither local nor remote unwind
is supported.

LIBUNWIND_LIBS is eliminated in LDFLAGS if local libunwind is not
supported.
Signed-off-by: NHe Kuang <hekuang@huawei.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1464924803-22214-7-git-send-email-hekuang@huawei.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      9d8e14d3
    • A
      perf stat: Basic support for TopDown in perf stat · 44b1e60a
      由 Andi Kleen 提交于 
      Add basic plumbing for TopDown in perf stat

TopDown is intended to replace the frontend cycles idle/ backend cycles
idle metrics in standard perf stat output.  These metrics are not
reliable in many workloads, due to out of order effects.

This implements a new --topdown mode in perf stat (similar to
--transaction) that measures the pipe line bottlenecks using
standardized formulas. The measurement can be all done with 5 counters
(one fixed counter)

The result are four metrics:

FrontendBound, BackendBound, BadSpeculation, Retiring

that describe the CPU pipeline behavior on a high level.

The full top down methology has many hierarchical metrics.  This
implementation only supports level 1 which can be collected without
multiplexing. A full implementation of top down on top of perf is
available in pmu-tools toplev.  (http://github.com/andikleen/pmu-tools)

The current version works on Intel Core CPUs starting with Sandy Bridge,
and Atom CPUs starting with Silvermont.  In principle the generic
metrics should be also implementable on other out of order CPUs.

TopDown level 1 uses a set of abstracted metrics which are generic to
out of order CPU cores (although some CPUs may not implement all of
them):

  topdown-total-slots       Available slots in the pipeline
  topdown-slots-issued      Slots issued into the pipeline
  topdown-slots-retired     Slots successfully retired
  topdown-fetch-bubbles     Pipeline gaps in the frontend
  topdown-recovery-bubbles  Pipeline gaps during recovery
                            from misspeculation

These metrics then allow to compute four useful metrics:

FrontendBound, BackendBound, Retiring, BadSpeculation.

Add a new --topdown options to enable events.  When --topdown is
specified set up events for all topdown events supported by the kernel.
Add topdown-* as a special case to the event parser, as is needed for
all events containing -.

The actual code to compute the metrics is in follow-on patches.

v2: Use standard sysctl read function.
v3: Move x86 specific code to arch/
v4: Enable --metric-only implicitly for topdown.
v5: Add --single-thread option to not force per core mode
v6: Fix output order of topdown metrics
v7: Allow combining with -d
v8: Remove --single-thread again
v9: Rename functions, adding arch_ and topdown_.
v10: Expand man page and describe TopDown better
Paste intro into commit description.
Print error when malloc fails.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1464119559-17203-1-git-send-email-andi@firstfloor.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      44b1e60a
  11. 30 5月, 2016 1 次提交
  13. 12 5月, 2016 1 次提交
  15. 11 5月, 2016 1 次提交
  17. 06 5月, 2016 3 次提交
  19. 27 4月, 2016 1 次提交
  21. 26 4月, 2016 1 次提交
  23. 21 4月, 2016 2 次提交
    • M
      tool/perf: Add sample_reg_mask to include all perf_regs · bb62bad6
      由 Madhavan Srinivasan 提交于 
      Add sample_reg_mask array with pt_regs registers.
This is needed for printing supported regs ( -I? option).
Signed-off-by: NMadhavan Srinivasan <maddy@linux.vnet.ibm.com>
Acked-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      bb62bad6
    • A
      tools/perf: Map the ID values with register names · dc642e83
      由 Anju T 提交于 
      Map ID values with corresponding register names. These names are then
displayed when user issues perf record with the -I option
followed by perf report/script with -D option.

To test this patchset, Eg:

  $ perf record -I ls   # record machine state at interrupt
  $ perf script -D      # read the perf.data file

Sample output obtained for this patch / output looks like as follows:

  496768515470 0x1988 [0x188]: PERF_RECORD_SAMPLE(IP, 0x1): 4522/4522:
  0xc0000000001e538c period: 1 addr: 0
  ... intr regs: mask 0x7ffffffffff ABI 64-bit
  .... r0    0xc0000000001e5e34
  .... r1    0xc000000fe733f9a0
  .... r2    0xc000000001523100
  .... r3    0xc000000ffaadeb60
  .... r4    0xc000000003456800
  .... r5    0x73a9b5e000
  .... r6    0x1e000000
  .... r7    0x0
  .... r8    0x0
  .... r9    0x0
  .... r10   0x1
  .... r11   0x0
  .... r12   0x24022822
  .... r13   0xc00000000feec180
  .... r14   0x0
  .... r15   0xc000001e4be18800
  .... r16   0x0
  .... r17   0xc000000ffaac5000
  .... r18   0xc000000fe733f8a0
  .... r19   0xc000000001523100
  .... r20   0xc00000000009fd1c
  .... r21   0xc000000fcaa69000
  .... r22   0xc0000000001e4968
  .... r23   0xc000000001523100
  .... r24   0xc000000fe733f850
  .... r25   0xc000000fcaa69000
  .... r26   0xc000000003b8fcf0
  .... r27   0xfffffffffffffead
  .... r28   0x0
  .... r29   0xc000000fcaa69000
  .... r30   0x1
  .... r31   0x0
  .... nip   0xc0000000001dd320
  .... msr   0x9000000000009032
  .... orig_r3 0xc0000000001e538c
  .... ctr   0xc00000000009d550
  .... link  0xc0000000001e5e34
  .... xer   0x0
  .... ccr   0x84022882
  .... softe 0x0
  .... trap  0xf01
  .... dar   0x0
  .... dsisr 0xf00040060000004
   ... thread: :4522:4522
   ...... dso: /root/.debug/.build-id/b0/ef11b1a1629e62ac9de75199117ee5ef9469e9
             :4522 4522 496.768515: 1 cycles: c0000000001e538c
             .perf_event_context_sched_in (/boot/vmlinux)
Signed-off-by: NAnju T <anju@linux.vnet.ibm.com>
Acked-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      dc642e83
  25. 12 4月, 2016 1 次提交
  27. 08 4月, 2016 2 次提交
    • A
      perf dwarf: Guard !x86_64 definitions under #ifdef else clause · f9383452
      由 Arnaldo Carvalho de Melo 提交于 
      To fix the build on Fedora Rawhide (gcc 6.0.0 20160311 (Red Hat 6.0.0-0.17):

    CC       /tmp/build/perf/arch/x86/util/dwarf-regs.o
  arch/x86/util/dwarf-regs.c:66:36: error: 'x86_32_regoffset_table' defined but not used [-Werror=unused-const-variable=]
   static const struct pt_regs_offset x86_32_regoffset_table[] = {
                                      ^~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-fghuksc1u8ln82bof4lwcj0o@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      f9383452
    • A
      perf tools: Build syscall table .c header from kernel's syscall_64.tbl · 1b700c99
      由 Arnaldo Carvalho de Melo 提交于 
      We used libaudit to map ids to syscall names and vice-versa, but that
imposes a delay in supporting new syscalls, having to wait for libaudit
to get those new syscalls on its tables.

To remove that delay, for x86_64 initially, grab a copy of
arch/x86/entry/syscalls/syscall_64.tbl and use it to generate those
tables.

Syscalls currently not available in audit-libs:

  # trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
  Error:	Invalid syscall copy_file_range, membarrier, mlock2, pread64, pwrite64, timerfd_create, userfaultfd
  Hint:	try 'perf list syscalls:sys_enter_*'
  Hint:	and: 'man syscalls'
  #

With this patch:

  # trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
    8505.733 ( 0.010 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 36
    8506.688 ( 0.005 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 40
   30023.097 ( 0.025 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63ae382000, count: 4096, pos: 529592320) = 4096
   31268.712 ( 0.028 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afd8b000, count: 4096, pos: 2314133504) = 4096
   31268.854 ( 0.016 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afda2000, count: 4096, pos: 2314137600) = 4096

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-51xfjbxevdsucmnbc4ka5r88@git.kernel.org
[ Added make dep for 'prepare' in 'LIBPERF_IN', fix by Wang Nan to fix parallell build ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      1b700c99
  29. 02 4月, 2016 2 次提交
  31. 31 3月, 2016 1 次提交
    • A
      perf tools: Add time conversion event · 46bc29b9
      由 Adrian Hunter 提交于 
      Intel PT uses the time members from the perf_event_mmap_page to convert
between TSC and perf time.

Due to a lack of foresight when Intel PT was implemented, those time
members were recorded in the (implementation dependent) AUXTRACE_INFO
event, the structure of which is generally inaccessible outside of the
Intel PT decoder.  However now the conversion between TSC and perf time
is needed when processing a jitdump file when Intel PT has been used for
tracing.

So add a user event to record the time members.  'perf record' will
synthesize the event if the information is available.  And session
processing will put a copy of the event on the session so that tools
like 'perf inject' can easily access it.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1457426324-30158-1-git-send-email-adrian.hunter@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      46bc29b9
  33. 29 3月, 2016 1 次提交
  35. 24 3月, 2016 1 次提交
  37. 11 3月, 2016 1 次提交
    • J
      perf jitdump: Build only on supported archs · e12b202f
      由 Jiri Olsa 提交于 
      Build jitdump only on architectures defined in util/genelf.h file, to avoid
breaking the build on such arches.
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Davidlohr Bueso <dbueso@suse.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Mel Gorman <mgorman@suse.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20160310164113.GA11357@krava.redhat.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      e12b202f
  39. 08 3月, 2016 1 次提交
  41. 03 3月, 2016 1 次提交
  43. 13 2月, 2016 1 次提交
  45. 30 1月, 2016 5 次提交
    • H
      perf kvm/powerpc: Add support for HCALL reasons · 78e6c39b
      由 Hemant Kumar 提交于 
      Powerpc provides hcall events that also provides insights into guest
behaviour. Enhance perf kvm stat to record and analyze hcall events.

 - To trace hcall events :
  perf kvm stat record

 - To show the results :
  perf kvm stat report --event=hcall

The result shows the number of hypervisor calls from the guest grouped
by their respective reasons displayed with the frequency.

This patch makes use of two additional tracepoints
"kvm_hv:kvm_hcall_enter" and "kvm_hv:kvm_hcall_exit". To map the hcall
codes to their respective names, it needs a mapping. Such mapping is
added in this patch in book3s_hcalls.h.

 # pgrep qemu
A sample output :
19378
60515

2 VMs running.

 # perf kvm stat record -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 4.153 MB perf.data.guest (39624
samples) ]

 # perf kvm stat report -p 60515 --event=hcall

Analyze events for all VMs, all VCPUs:

    HCALL-EVENT Samples Samples% Time% MinTime MaxTime  AvgTime

          H_IPI     822  66.08% 88.10% 0.63us  11.38us 2.05us (+- 1.42%)
     H_SEND_CRQ     144  11.58%  3.77% 0.41us   0.88us 0.50us (+- 1.47%)
   H_VIO_SIGNAL     118   9.49%  2.86% 0.37us   0.83us 0.47us (+- 1.43%)
H_PUT_TERM_CHAR      76   6.11%  2.07% 0.37us   0.90us 0.52us (+- 2.43%)
H_GET_TERM_CHAR      74   5.95%  2.23% 0.37us   1.70us 0.58us (+- 4.77%)
         H_RTAS       6   0.48%  0.85% 1.10us   9.25us 2.70us (+-48.57%)
      H_PERFMON       4   0.32%  0.12% 0.41us   0.96us 0.59us (+-20.92%)

Total Samples:1244, Total events handled time:1916.69us.
Signed-off-by: NHemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Scott  Wood <scottwood@freescale.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1453962787-15376-4-git-send-email-hemant@linux.vnet.ibm.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      78e6c39b
    • H
      perf kvm/powerpc: Port perf kvm stat to powerpc · 066d3593
      由 Hemant Kumar 提交于 
      perf kvm can be used to analyze guest exit reasons. This support already
exists in x86. Hence, porting it to powerpc.

 - To trace KVM events :
  perf kvm stat record
  If many guests are running, we can track for a specific guest by using
  --pid as in : perf kvm stat record --pid <pid>

 - To see the results :
  perf kvm stat report

The result shows the number of exits (from the guest context to
host/hypervisor context) grouped by their respective exit reasons with
their frequency.

Since, different powerpc machines have different KVM tracepoints, this
patch discovers the available tracepoints dynamically and accordingly
looks for them. If any single tracepoint is not present, this support
won't be enabled for reporting. To record, this will fail if any of the
events we are looking to record isn't available.  Right now, its only
supported on PowerPC Book3S_HV architectures.

To analyze the different exits, group them and present them (in a slight
descriptive way) to the user, we need a mapping between the "exit code"
(dumped in the kvm_guest_exit tracepoint data) and to its related
Interrupt vector description (exit reason). This patch adds this mapping
in book3s_hv_exits.h.

It records on two available KVM tracepoints for book3s_hv:

"kvm_hv:kvm_guest_exit" and "kvm_hv:kvm_guest_enter".

Here is a sample o/p:
 # pgrep qemu
19378
60515

2 Guests are running on the host.

 # perf kvm stat record -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 4.153 MB perf.data.guest (39624
samples) ]

 # perf kvm stat report -p 60515

Analyze events for pid(s) 60515, all VCPUs:

     VM-EXIT Samples Samples% Time% MinTime    MaxTime  Avg time

       SYSCALL  9141  63.67%  7.49% 1.26us   5782.39us    9.87us (+- 6.46%)
H_DATA_STORAGE  4114  28.66%  5.07% 1.72us   4597.68us   14.84us (+-20.06%)
HV_DECREMENTER   418   2.91%  4.26% 0.70us  30002.22us  122.58us (+-70.29%)
      EXTERNAL   392   2.73%  0.06% 0.64us    104.10us    1.94us (+-18.83%)
RETURN_TO_HOST   287   2.00% 83.11% 1.53us 124240.15us 3486.52us (+-16.81%)
H_INST_STORAGE     5   0.03%  0.00% 1.88us      3.73us    2.39us (+-14.20%)

Total Samples:14357, Total events handled time:1203918.42us.
Signed-off-by: NHemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Scott  Wood <scottwood@freescale.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1453962787-15376-3-git-send-email-hemant@linux.vnet.ibm.comSigned-off-by: NSrikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      066d3593
    • H
      perf kvm/{x86,s390}: Remove const from kvm_events_tp · 48deaa74
      由 Hemant Kumar 提交于 
      This patch removes the "const" qualifier from kvm_events_tp declaration
to account for the fact that some architectures may need to update this
variable dynamically. For instance, powerpc will need to update this
variable dynamically depending on the machine type.
Signed-off-by: NHemant Kumar <hemant@linux.vnet.ibm.com>
Acked-by: NDavid Ahern <dsahern@gmail.com>
Cc: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Scott  Wood <scottwood@freescale.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1453962787-15376-2-git-send-email-hemant@linux.vnet.ibm.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      48deaa74
    • H
      perf kvm/{x86,s390}: Remove dependency on uapi/kvm_perf.h · 162607ea
      由 Hemant Kumar 提交于 
      Its better to remove the dependency on uapi/kvm_perf.h to allow dynamic
discovery of kvm events (if its needed). To do this, some extern
variables have been introduced with which we can keep the generic
functions generic.
Signed-off-by: NHemant Kumar <hemant@linux.vnet.ibm.com>
Acked-by: NAlexander Yarygin <yarygin@linux.vnet.ibm.com>
Acked-by: NDavid Ahern <dsahern@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Scott  Wood <scottwood@freescale.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1453962787-15376-1-git-send-email-hemant@linux.vnet.ibm.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      162607ea
    • M
      perf auxtrace: Add perf_evlist pointer to *info_priv_size() · 14a05e13
      由 Mathieu Poirier 提交于 
      On some architecture the size of the private header may be dependent on
the number of tracers used in the session.  As such adding a "struct
perf_evlist *" parameter, which should contain all the required
information.

Also adjusting the existing client of the interface to take the new
parameter into account.
Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Cc: Al Grant <al.grant@arm.com>
Cc: Chunyan Zhang <zhang.chunyan@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: Mike Leach <mike.leach@arm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rabin Vincent <rabin@rab.in>
Cc: Tor Jeremiassen <tor@ti.com>
Link: http://lkml.kernel.org/r/1452807977-8069-22-git-send-email-mathieu.poirier@linaro.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      14a05e13
  47. 26 1月, 2016 1 次提交
  49. 09 1月, 2016 1 次提交
  51. 08 1月, 2016 1 次提交
  53. 07 1月, 2016 1 次提交
    • A
      perf tests: No need to set attr.sample_freq in the perf time to TSC test · 4f4ba0e6
      由 Arnaldo Carvalho de Melo 提交于 
      We were asking for a 4kHz sample_freq, making the test fail needlessly
when the system reduced /proc/sys/kernel/perf_event_max_sample_rate
below that.

In this test we only look at the PERF_SAMPLE_TIME fields in PERF_RECORD_
meta events, no need to set sample_freq.

Thanks to Namhyung for suggesting that max_sample_rate could be the
reason for the test failure, seeing the 'perf test -vv' output I sent.

Before:

  # echo 1000 > /proc/sys/kernel/perf_event_max_sample_rate
  # perf test TSC
  45: Test converting perf time to TSC   : FAILED!

After:

  # perf test TSC
  45: Test converting perf time to TSC   : Ok
  # cat /proc/sys/kernel/perf_event_max_sample_rate
  1000

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-lcob05qhawkuvsyuu9g1fld5@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      4f4ba0e6
  55. 18 12月, 2015 1 次提交