1. 14 5月, 2014 8 次提交
  2. 08 5月, 2014 1 次提交
    • S
      tracing: Add trace_<tracepoint>_enabled() function · 7c65bbc7
      Steven Rostedt (Red Hat) 提交于
      There are some code paths in the kernel that need to do some preparations
      before it calls a tracepoint. As that code is worthless overhead when
      the tracepoint is not enabled, it would be prudent to have that code
      only run when the tracepoint is active. To accomplish this, all tracepoints
      now get a static inline function called "trace_<tracepoint-name>_enabled()"
      which returns true when the tracepoint is enabled and false otherwise.
      
      As an added bonus, that function uses the static_key of the tracepoint
      such that no branch is needed.
      
        if (trace_mytracepoint_enabled()) {
      	arg = process_tp_arg();
      	trace_mytracepoint(arg);
        }
      
      Will keep the "process_tp_arg()" (which may be expensive to run) from
      being executed when the tracepoint isn't enabled.
      
      It's best to encapsulate the tracepoint itself in the if statement
      just to keep races. For example, if you had:
      
        if (trace_mytracepoint_enabled())
      	arg = process_tp_arg();
        trace_mytracepoint(arg);
      
      There's a chance that the tracepoint could be enabled just after the
      if statement, and arg will be undefined when calling the tracepoint.
      
      Link: http://lkml.kernel.org/r/20140506094407.507b6435@gandalf.local.homeAcked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      7c65bbc7
  3. 06 5月, 2014 1 次提交
  4. 05 5月, 2014 1 次提交
    • F
      tracing: Remove myself as a tracing maintainer · 3415c28c
      Frederic Weisbecker 提交于
      It has been a while since I last sent a tracing patch. I always keep an
      eye on tracing evolutions and contributions in general but given
      how busy I am with nohz, isolation and more generally core cleanups stuff,
      I seldom have time left to provide deep reviews of tracing patches nor
      simply for reviews to begin with.
      
      I've been very lucky to start kernel development on a very young subsystem
      with tons of low hanging fruits back in 2008. Given that it deals with
      a lot of tricky stuffs all around (sched, timers, irq, preemption, NMIs,
      SMP, RCU, ....) I basically learned everything there.
      
      Steve has been doing most of the incredible work these last years.
      Thanks a lot!
      
      Of course consider me always available to help on tracing if any hard
      days happen.
      
      Link: http://lkml.kernel.org/p/1399131991-13216-1-git-send-email-fweisbec@gmail.com
      
      Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      3415c28c
  5. 02 5月, 2014 1 次提交
  6. 30 4月, 2014 2 次提交
  7. 25 4月, 2014 2 次提交
  8. 22 4月, 2014 8 次提交
  9. 21 4月, 2014 4 次提交
  10. 20 4月, 2014 9 次提交
    • I
      Merge tag 'perf-urgent-for-mingo' of... · fd741edc
      Ingo Molnar 提交于
      Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf into perf/urgent
      
      Pull perf/urgent fixes from Jiri Olsa:
      
      User visible changes:
      
        * Adjust symbols in VDSO to properly resolve its function names (Vladimir Nikulichev)
      
        * Improve error reporting for record session failure (Adrien BAK)
      
        * Fix 'Min time' counting in report command (Alexander Yarygin)
      Signed-off-by: NJiri Olsa <jolsa@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      fd741edc
    • A
      perf tools: Improve error reporting · ffa91880
      Adrien BAK 提交于
      In the current version, when using perf record, if something goes
      wrong in tools/perf/builtin-record.c:375
        session = perf_session__new(file, false, NULL);
      
      The error message:
      "Not enough memory for reading per file header"
      
      is issued. This error message seems to be outdated and is not very
      helpful. This patch proposes to replace this error message by
      "Perf session creation failed"
      
      I believe this issue has been brought to lkml:
      https://lkml.org/lkml/2014/2/24/458
      although this patch only tackles a (small) part of the issue.
      
      Additionnaly, this patch improves error reporting in
      tools/perf/util/data.c open_file_write.
      
      Currently, if the call to open fails, the user is unaware of it.
      This patch logs the error, before returning the error code to
      the caller.
      Reported-by: NWill Deacon <will.deacon@arm.com>
      Signed-off-by: NAdrien BAK <adrien.bak@metascale.org>
      Link: http://lkml.kernel.org/r/1397786443.3093.4.camel@beast
      [ Reorganize the changelog into paragraphs ]
      [ Added empty line after fd declaration in open_file_write ]
      Signed-off-by: NJiri Olsa <jolsa@redhat.com>
      ffa91880
    • V
      perf tools: Adjust symbols in VDSO · 922d0e4d
      Vladimir Nikulichev 提交于
      pert-report doesn't resolve function names in VDSO:
      
      $ perf report --stdio -g flat,0.0,15,callee --sort pid
      ...
                  8.76%
                     0x7fff6b1fe861
                     __gettimeofday
                     ACE_OS::gettimeofday()
      ...
      
      In this case symbol values should be adjusted the same way as for executables,
      relocatable objects and prelinked libraries.
      
      After fix:
      
      $ perf report --stdio -g flat,0.0,15,callee --sort pid
      ...
                  8.76%
                     __vdso_gettimeofday
                     __gettimeofday
                     ACE_OS::gettimeofday()
      Signed-off-by: NVladimir Nikulichev <nvs@tbricks.com>
      Tested-by: NNamhyung Kim <namhyung@kernel.org>
      Reviewed-by: NAdrian Hunter <adrian.hunter@intel.com>
      Link: http://lkml.kernel.org/r/969812.163009436-sendEmail@nvsSigned-off-by: NJiri Olsa <jolsa@redhat.com>
      922d0e4d
    • A
      perf kvm: Fix 'Min time' counting in report command · acb61fc8
      Alexander Yarygin 提交于
      Every event in the perf-kvm has a 'stats' structure, which contains
      max/min/average/etc times of handling this event.
      The problem is that the 'perf-kvm stat report' command always shows
      that 'min time' is 0us for every event. Example:
      
       # perf kvm stat report
      
       Analyze events for all VCPUs:
      
          VM-EXIT    Samples  Samples%     Time%   Min Time   Max Time Avg time
        [..]
        0xB2 MSCH         12     0.07%     0.00%        0us        8us 7.31us ( +-   2.11% )
        0xB2 CHSC         12     0.07%     0.00%        0us       18us 9.39us ( +-   9.49% )
        0xB2 STPX          8     0.05%     0.00%        0us        2us 1.88us ( +-   7.18% )
        0xB2 STSI          7     0.04%     0.00%        0us       44us 16.49us ( +-  38.20% )
        [..]
      
      This happens because the 'stats' structure is not initialized and
      stats->min equals to 0. Lets initialize the structure for every
      event after its allocation using init_stats() function. This initializes
      stats->min to -1 and makes 'Min time' statistics counting work:
      
       # perf kvm stat report
      
       Analyze events for all VCPUs:
      
          VM-EXIT    Samples  Samples%     Time%   Min Time   Max Time Avg time
        [..]
        0xB2 MSCH         12     0.07%     0.00%        6us        8us 7.31us ( +-   2.11% )
        0xB2 CHSC         12     0.07%     0.00%        7us       18us 9.39us ( +-   9.49% )
        0xB2 STPX          8     0.05%     0.00%        1us        2us 1.88us ( +-   7.18% )
        0xB2 STSI          7     0.04%     0.00%        1us       44us 16.49us ( +-  38.20% )
        [..]
      Signed-off-by: NAlexander Yarygin <yarygin@linux.vnet.ibm.com>
      Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
      Reviewed-by: NDavid Ahern <dsahern@gmail.com>
      Link: http://lkml.kernel.org/r/1397053319-2130-3-git-send-email-borntraeger@de.ibm.com
      [ Fixing the perf examples changelog output ]
      Signed-off-by: NJiri Olsa <jolsa@redhat.com>
      acb61fc8
    • E
      coredump: fix va_list corruption · 404ca80e
      Eric Dumazet 提交于
      A va_list needs to be copied in case it needs to be used twice.
      
      Thanks to Hugh for debugging this issue, leading to various panics.
      
      Tested:
      
        lpq84:~# echo "|/foobar12345 %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h" >/proc/sys/kernel/core_pattern
      
      'produce_core' is simply : main() { *(int *)0 = 1;}
      
        lpq84:~# ./produce_core
        Segmentation fault (core dumped)
        lpq84:~# dmesg | tail -1
        [  614.352947] Core dump to |/foobar12345 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 lpq84 (null) pipe failed
      
      Notice the last argument was replaced by a NULL (we were lucky enough to
      not crash, but do not try this on your production machine !)
      
      After fix :
      
        lpq83:~# echo "|/foobar12345 %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h %h" >/proc/sys/kernel/core_pattern
        lpq83:~# ./produce_core
        Segmentation fault
        lpq83:~# dmesg | tail -1
        [  740.800441] Core dump to |/foobar12345 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 lpq83 pipe failed
      
      Fixes: 5fe9d8ca ("coredump: cn_vprintf() has no reason to call vsnprintf() twice")
      Signed-off-by: NEric Dumazet <edumazet@google.com>
      Diagnosed-by: NHugh Dickins <hughd@google.com>
      Acked-by: NOleg Nesterov <oleg@redhat.com>
      Cc: Neil Horman <nhorman@tuxdriver.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: stable@vger.kernel.org # 3.11+
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      404ca80e
    • L
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 6d459690
      Linus Torvalds 提交于
      Pull x86 fix from Ingo Molnar:
       "This fixes the preemption-count imbalance crash reported by Owen
        Kibel"
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/mce: Fix CMCI preemption bugs
      6d459690
    • L
      Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 8f98f6f5
      Linus Torvalds 提交于
      Pull scheduler fixes from Ingo Molnar:
       "Two fixes:
      
         - a SCHED_DEADLINE task selection fix
         - a sched/numa related lockdep splat fix"
      
      * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        sched: Check for stop task appearance when balancing happens
        sched/numa: Fix task_numa_free() lockdep splat
      8f98f6f5
    • L
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 8de3f7a7
      Linus Torvalds 提交于
      Pull perf fixes from Ingo Molnar:
       "Two kernel side fixes:
      
         - an Intel uncore PMU driver potential crash fix
         - a kprobes/perf-call-graph interaction fix"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
        kprobes/x86: Fix page-fault handling logic
      8de3f7a7
    • L
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · b9312420
      Linus Torvalds 提交于
      Pull drm fixes from Dave Airlie:
       "Unfortunately this contains no easter eggs, its a bit larger than I'd
        like, but I included a patch that just moves code from one file to
        another and I'd like to avoid merge conflicts with that later, so it
        makes it seem worse than it is,
      
        Otherwise:
         - radeon: fixes to use new microcode to stabilise some cards, use
           some common displayport code, some runtime pm fixes, pll regression
           fixes
         - i915: fix for some context oopses, a warn in a used path, backlight
           fixes
         - nouveau: regression fix
         - omap: a bunch of fixes"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (51 commits)
        drm: bochs: drop unused struct fields
        drm: bochs: add power management support
        drm: cirrus: add power management support
        drm: Split out drm_probe_helper.c from drm_crtc_helper.c
        drm/plane-helper: Don't fake-implement primary plane disabling
        drm/ast: fix value check in cbr_scan2
        drm/nouveau/bios: fix a bit shift error introduced by 457e77b2
        drm/radeon/ci: make sure mc ucode is loaded before checking the size
        drm/radeon/si: make sure mc ucode is loaded before checking the size
        drm/radeon: improve PLL params if we don't match exactly v2
        drm/radeon: memory leak on bo reservation failure. v2
        drm/radeon: fix VCE fence command
        drm/radeon: re-enable mclk dpm on R7 260X asics
        drm/radeon: add support for newer mc ucode on CI (v2)
        drm/radeon: add support for newer mc ucode on SI (v2)
        drm/radeon: apply more strict limits for PLL params v2
        drm/radeon: update CI DPM powertune settings
        drm/radeon: fix runpm handling on APUs (v4)
        drm/radeon: disable mclk dpm on R7 260X
        drm/tegra: Remove gratuitous pad field
        ...
      b9312420
  11. 19 4月, 2014 3 次提交
    • D
      Merge branch 'drm-next-3.15-wip' of git://people.freedesktop.org/~deathsimple/linux into drm-next · a42892ed
      Dave Airlie 提交于
      Some i2c fixes over DisplayPort.
      
      * 'drm-next-3.15-wip' of git://people.freedesktop.org/~deathsimple/linux:
        drm/radeon: Improve vramlimit module param documentation
        drm/radeon: fix audio pin counts for DCE6+ (v2)
        drm/radeon/dp: switch to the common i2c over aux code
        drm/dp/i2c: Update comments about common i2c over dp assumptions (v3)
        drm/dp/i2c: send bare addresses to properly reset i2c connections (v4)
        drm/radeon/dp: handle zero sized i2c over aux transactions (v2)
        drm/i915: support address only i2c-over-aux transactions
        drm/tegra: dp: Support address-only I2C-over-AUX transactions
      a42892ed
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · ebfc45ee
      Linus Torvalds 提交于
      Pull more networking fixes from David Miller:
      
       1) Fix mlx4_en_netpoll implementation, it needs to schedule a NAPI
          context, not synchronize it.  From Chris Mason.
      
       2) Ipv4 flow input interface should never be zero, it should be
          LOOPBACK_IFINDEX instead.  From Cong Wang and Julian Anastasov.
      
       3) Properly configure MAC to PHY connection in mvneta devices, from
          Thomas Petazzoni.
      
       4) sys_recv should use SYSCALL_DEFINE.  From Jan Glauber.
      
       5) Tunnel driver ioctls do not use the correct namespace, fix from
          Nicolas Dichtel.
      
       6) Fix memory leak on seccomp filter attach, from Kees Cook.
      
       7) Fix lockdep warning for nested vlans, from Ding Tianhong.
      
       8) Crashes can happen in SCTP due to how the auth_enable value is
          managed, fix from Vlad Yasevich.
      
       9) Wireless fixes from John W Linville and co.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (45 commits)
        net: sctp: cache auth_enable per endpoint
        tg3: update rx_jumbo_pending ring param only when jumbo frames are enabled
        vlan: Fix lockdep warning when vlan dev handle notification
        seccomp: fix memory leak on filter attach
        isdn: icn: buffer overflow in icn_command()
        ip6_tunnel: use the right netns in ioctl handler
        sit: use the right netns in ioctl handler
        ip_tunnel: use the right netns in ioctl handler
        net: use SYSCALL_DEFINEx for sys_recv
        net: mdio-gpio: Add support for separate MDI and MDO gpio pins
        net: mdio-gpio: Add support for active low gpio pins
        net: mdio-gpio: Use devm_ functions where possible
        ipv4, route: pass 0 instead of LOOPBACK_IFINDEX to fib_validate_source()
        ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif
        mlx4_en: don't use napi_synchronize inside mlx4_en_netpoll
        net: mvneta: properly configure the MAC <-> PHY connection in all situations
        net: phy: add minimal support for QSGMII PHY
        sfc:On MCDI timeout, issue an FLR (and mark MCDI to fail-fast)
        mwifiex: fix hung task on command timeout
        mwifiex: process event before command response
        ...
      ebfc45ee
    • L
      Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 · 6e66d5da
      Linus Torvalds 提交于
      Pull cifs fixes from Steve French:
       "A set of 5 small cifs fixes"
      
      * 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
        cif: fix dead code
        cifs: fix error handling cifs_user_readv
        fs: cifs: remove unused variable.
        Return correct error on query of xattr on file with empty xattrs
        cifs: Wait for writebacks to complete before attempting write.
      6e66d5da