1. 09 Dec, 2010 5 commits
  2. 08 Dec, 2010 2 commits
    • Peter Zijlstra's avatar
      perf: Stop all counters on reboot · c277443c
      Peter Zijlstra authored
      Use the reboot notifier to detach all running counters on reboot, this
      solves a problem with kexec where the new kernel doesn't expect
      running counters (rightly so).
      
      It will however decrease the coverage of the NMI watchdog. Making a
      kexec specific reboot notifier callback would be best, however that
      would require touching all notifier callback handlers as they are not
      properly structured to deal with new state.
      
      As a compromise, place the perf reboot notifier at the very last
      position in the list.
      Reported-by: default avatarYinghai Lu <yinghai@kernel.org>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Vivek Goyal <vgoyal@redhat.com>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Cc: Jason Wessel <jason.wessel@windriver.com>
      Cc: Don Zickus <dzickus@redhat.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      c277443c
    • Peter Zijlstra's avatar
      perf, amd: Remove the nb lock · c079c791
      Peter Zijlstra authored
      Since all the hotplug stuff is serialized by the hotplug mutex,
      do away with the amd_nb_lock.
      
      Cc: Stephane Eranian <eranian@google.com>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      c079c791
  3. 07 Dec, 2010 6 commits
  4. 06 Dec, 2010 23 commits
    • Linus Torvalds's avatar
      Merge branch 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6 · 7787d2c2
      Linus Torvalds authored
      * 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
        PM / Hibernate: Fix memory corruption related to swap
        PM / Hibernate: Use async I/O when reading compressed hibernation image
      7787d2c2
    • Rafael J. Wysocki's avatar
      PM / Hibernate: Fix memory corruption related to swap · c9e664f1
      Rafael J. Wysocki authored
      There is a problem that swap pages allocated before the creation of
      a hibernation image can be released and used for storing the contents
      of different memory pages while the image is being saved.  Since the
      kernel stored in the image doesn't know of that, it causes memory
      corruption to occur after resume from hibernation, especially on
      systems with relatively small RAM that need to swap often.
      
      This issue can be addressed by keeping the GFP_IOFS bits clear
      in gfp_allowed_mask during the entire hibernation, including the
      saving of the image, until the system is finally turned off or
      the hibernation is aborted.  Unfortunately, for this purpose
      it's necessary to rework the way in which the hibernate and
      suspend code manipulates gfp_allowed_mask.
      
      This change is based on an earlier patch from Hugh Dickins.
      Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      Reported-by: default avatarOndrej Zary <linux@rainbow-software.org>
      Acked-by: default avatarHugh Dickins <hughd@google.com>
      Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: stable@kernel.org
      c9e664f1
    • Linus Torvalds's avatar
      Merge master.kernel.org:/home/rmk/linux-2.6-arm · 60658f8a
      Linus Torvalds authored
      * master.kernel.org:/home/rmk/linux-2.6-arm:
        ARM: 6524/1: GIC irq desciptor bug fix
        ARM: 6523/1: iop: ensure sched_clock() is notrace
        ARM: 6456/1: Fix for building DEBUG with sa11xx_base.c as a module.
        ARM: 6519/1: kuser: Fix incorrect cmpxchg syscall in kuser helpers
        ARM: 6505/1: kprobes: Don't HAVE_KPROBES when CONFIG_THUMB2_KERNEL is selected
        ARM: 6508/1: vexpress: Correct data alignment in headsmp.S for CONFIG_THUMB2_KERNEL
        ARM: 6507/1: RealView: Correct data alignment in headsmp.S for CONFIG_THUMB2_KERNEL
        ARM: 6504/1: Thumb-2: Fix long-distance conditional branches in head.S for Thumb-2.
        ARM: 6503/1: Thumb-2: Restore sensible zImage header layout for CONFIG_THUMB2_KERNEL
        ARM: 6502/1: Thumb-2: Fix CONFIG_THUMB2_KERNEL breakage in compressed/head.S
        ARM: 6501/1: Thumb-2: Correct data alignment for CONFIG_THUMB2_KERNEL in mm/proc-v7.S
        ARM: 6500/1: Thumb-2: Correct data alignment for CONFIG_THUMB2_KERNEL in kernel/head.S
        ARM: 6499/1: Thumb-2: Correct data alignment for CONFIG_THUMB2_KERNEL in bootp/init.S
        ARM: 6498/1: vfp: Correct data alignment for CONFIG_THUMB2_KERNEL
        ARM: 6497/1: kexec: Correct data alignment for CONFIG_THUMB2_KERNEL
        ARM: 6496/1: GIC: Do not try to register more then NR_IRQS interrupts
        ARM: cns3xxx: Fix build with CONFIG_PCI=y
      60658f8a
    • Bojan Smojver's avatar
      PM / Hibernate: Use async I/O when reading compressed hibernation image · 9f339caf
      Bojan Smojver authored
      This is a fix for reading LZO compressed image using async I/O.
      Essentially, instead of having just one page into which we keep
      reading blocks from swap, we allocate enough of them to cover the
      largest compressed size and then let block I/O pick them all up. Once
      we have them all (and here we wait), we decompress them, as usual.
      Obviously, the very first block we still pick up synchronously,
      because we need to know the size of the lot before we pick up the
      rest.
      
      Also fixed the copyright line, which I've forgotten before.
      Signed-off-by: default avatarBojan Smojver <bojan@rexursive.com>
      Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      9f339caf
    • Masami Hiramatsu's avatar
      kprobes: Use text_poke_smp_batch for unoptimizing · f984ba4e
      Masami Hiramatsu authored
      Use text_poke_smp_batch() on unoptimization path for reducing
      the number of stop_machine() issues. If the number of
      unoptimizing probes is more than MAX_OPTIMIZE_PROBES(=256),
      kprobes unoptimizes first MAX_OPTIMIZE_PROBES probes and kicks
      optimizer for remaining probes.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      LKML-Reference: <20101203095434.2961.22657.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f984ba4e
    • Masami Hiramatsu's avatar
      kprobes: Use text_poke_smp_batch for optimizing · cd7ebe22
      Masami Hiramatsu authored
      Use text_poke_smp_batch() in optimization path for reducing
      the number of stop_machine() issues. If the number of optimizing
      probes is more than MAX_OPTIMIZE_PROBES(=256), kprobes optimizes
      first MAX_OPTIMIZE_PROBES probes and kicks optimizer for
      remaining probes.
      
      Changes in v5:
      - Use kick_kprobe_optimizer() instead of directly calling
        schedule_delayed_work().
      - Rescheduling optimizer outside of kprobe mutex lock.
      
      Changes in v2:
      - Allocate code buffer and parameters in arch_init_kprobes()
        instead of using static arraies.
      - Merge previous max optimization limit patch into this patch.
        So, this patch introduces upper limit of optimization at
        once.
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      LKML-Reference: <20101203095428.2961.8994.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      cd7ebe22
    • Masami Hiramatsu's avatar
      x86: Introduce text_poke_smp_batch() for batch-code modifying · 7deb18dc
      Masami Hiramatsu authored
      Introduce text_poke_smp_batch(). This function modifies several
      text areas with one stop_machine() on SMP. Because calling
      stop_machine() is heavy task, it is better to aggregate
      text_poke requests.
      
      ( Note: I've talked with Rusty about this interface, and
        he would not like to expand stop_machine() interface, since
        it is not for generic use. )
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: Jan Beulich <jbeulich@novell.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095422.2961.51217.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      7deb18dc
    • Masami Hiramatsu's avatar
      kprobes: Reuse unused kprobe · 0490cd1f
      Masami Hiramatsu authored
      Reuse unused (waiting for unoptimizing and no user handler)
      kprobe on given address instead of returning -EBUSY for
      registering a new kprobe.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095416.2961.39080.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      0490cd1f
    • Masami Hiramatsu's avatar
      kprobes: Support delayed unoptimizing · 6274de49
      Masami Hiramatsu authored
      Unoptimization occurs when a probe is unregistered or disabled,
      and is heavy because it recovers instructions by using
      stop_machine(). This patch delays unoptimization operations and
      unoptimize several probes at once by using
      text_poke_smp_batch(). This can avoid unexpected system slowdown
      coming from stop_machine().
      
      Changes in v5:
      - Split this patch into several cleanup patches and this patch.
      - Fix some text_mutex lock miss.
      - Use bool instead of int for behavior flags.
      - Add additional comment for (un)optimizing path.
      
      Changes in v2:
      - Use dynamic allocated buffers and params.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095409.2961.82733.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      6274de49
    • Masami Hiramatsu's avatar
      kprobes: Separate kprobe optimizing code from optimizer · 61f4e13f
      Masami Hiramatsu authored
      Separate kprobe optimizing code from optimizer, this
      will make easy to introducing unoptimizing code in
      optimizer.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095403.2961.91201.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      61f4e13f
    • Masami Hiramatsu's avatar
      kprobes: Cleanup disabling and unregistering path · 6f0f1dd7
      Masami Hiramatsu authored
      Merge disabling kprobe to unregistering kprobe function
      and add comments for disabing/unregistring process.
      
      Current unregistering code disables(disarms) kprobes after
      checking target kprobe status. This patch changes it to
      disabling kprobe first after that it changing the kprobe's
      state. This allows to share probe disabling code between
      disable_kprobe() and unregister_kprobe().
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095356.2961.30152.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      6f0f1dd7
    • Masami Hiramatsu's avatar
      kprobes: Rename old_p to more appropriate name · 6d8e40a8
      Masami Hiramatsu authored
      Rename irrelevant uses of "old_p" to more appropriate names.
      Originally, "old_p" just meant "the old kprobe on given address"
      but current code uses that name as "just another kprobe" or
      something like that. This patch renames those pointer names
      to more appropriate one for maintainability.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: 2nddept-manager@sdl.hitachi.co.jp
      LKML-Reference: <20101203095350.2961.48110.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      6d8e40a8
    • Russell King's avatar
    • Chris Samuel's avatar
      perf tools: Catch a few uncheck calloc/malloc's · ce47dc56
      Chris Samuel authored
      There were a few stray calloc()'s and malloc()'s which were not having
      their return values checked for success.
      
      As the calling code either already coped with failure or didn't actually
      care we just return -ENOMEM at that point.
      
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: default avatarChris Samuel <chris@csamuel.org>
      LKML-Reference: <4CDDF95A.1050400@csamuel.org>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      ce47dc56
    • Stephane Eranian's avatar
      perf script: Fix compiler warning in builtin_script.c:is_top_script() · 965bb6be
      Stephane Eranian authored
      Fix annoying compiler warning in the is_top_script() function.
      
      The issue was that a const char * was cast into a char * to call
      ends_with(). We fix the users of ends_with() instead. Some are passing a
      char *, but it is okay to cast the return value of ends_with() to char *
      (because we understand what ends_with() does).
      
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@gmail.com>
      LKML-Reference: <4cf92096.17edd80a.1540.5d60@mx.google.com>
      Signed-off-by: default avatarStephane Eranian <eranian@google.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      965bb6be
    • Thomas Gleixner's avatar
      perf session: Sort all events if ordered_samples=true · cbf41645
      Thomas Gleixner authored
      Now that we have timestamps on FORK, EXIT, COMM, MMAP events we can
      sort everything in time order. This fixes the following observed
      problem:
      
      mmap(file1) -> pagefault() -> munmap(file1)
      mmap(file2) -> pagefault() -> munmap(file2)
      
      Resulted in decoding both pagefaults in file2 because the file1 map
      was already replaced by the file2 map when the map address was
      identical.
      
      With all events sorted we decode both pagefaults correctly.
      
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      LKML-Reference: <alpine.LFD.2.00.1012051220450.2653@localhost6.localdomain6>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      cbf41645
    • Akihiro Nagai's avatar
      perf options: add OPT_CALLBACK_DEFAULT_NOOPT · e4e18d56
      Akihiro Nagai authored
      Add new macro OPT_CALLBACK_DEFAULT_NOOPT for parse_options.
      
      It enables to pass the default value (opt->defval) to the callback function
      processing options require no argument.
      Reviewed-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      LKML-Reference: <20101203035853.7827.17502.stgit@localhost6.localdomain6>
      Signed-off-by: default avatarAkihiro Nagai <akihiro.nagai.hw@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      e4e18d56
    • Ian Munsie's avatar
      perf hist: Better displaying of unresolved DSOs and symbols · 1437a30a
      Ian Munsie authored
      In the event that a DSO has not been identified, just print out [unknown]
      instead of the instruction pointer as we previously were doing, which is pretty
      meaningless for a shared object (at least to the users perspective).
      
      The IP we print out is fairly meaningless in general anyway - it's just one
      (the first) of the many addresses that were lumped together as unidentified,
      and could span many shared objects and symbols. In reality if we see this
      [unknown] output then the report -D output is going to be more useful anyway as
      we can see all the different address that it represents.
      
      If we are printing the symbols we are still going to see this IP in that column
      anyway since they shouldn't resolve either.
      
      This patch also changes the symbol address printouts so that they print out 0x
      before the address, are left aligned, and changes the %L format string (which
      relies on a glibc bug) to %ll.
      
      Before:
          74.11%    :3259               4a6c  [k]     4a6c
      After:
          74.11%    :3259  [unknown]          [k] 0x4a6c
      
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      LKML-Reference: <1291603026-11785-2-git-send-email-imunsie@au1.ibm.com>
      Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      1437a30a
    • Chao Xie's avatar
      ARM: 6524/1: GIC irq desciptor bug fix · 87507500
      Chao Xie authored
      gic_set_cpu will directly use irq_desc[]. If CONFIG_SPARSE_IRQ is
      enabled, there is no irq_desc[]. So we need use irq_to_desc(irq) to
      get the descriptor for irq.
      Signed-off-by: default avatarChao Xie <chao.xie@marvell.com>
      Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      87507500
    • Linus Torvalds's avatar
    • Linus Torvalds's avatar
      Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 · 31c67c75
      Linus Torvalds authored
      * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6:
        initramfs: Really fix build break on symbol-prefixed archs
        [media] Fix Kconfig errors due to two visible menus
        i2c/algos: convert Kconfig to use the menu's `visible' keyword
        media/video: convert Kconfig to use the menu's `visible' keyword
        Revert "i2c: Fix Kconfig dependencies"
        kconfig: regen parser
        kconfig: add an option to determine a menu's visibility
      31c67c75
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6 · 47ad504c
      Linus Torvalds authored
      * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
        parisc: Fix GSC PS/2 driver name for keyboard and mouse
        parisc: KittyHawk LCD fix
        parisc: convert the rest of the irq handlers to simple/percpu
        parisc: fix dino/gsc interrupts
        parisc: remove redundant initialization in sigsegv path of sys_rt_sigreturn
      47ad504c
    • Eric W. Biederman's avatar
      Revert "vfs: show unreachable paths in getcwd and proc" · 7b2a69ba
      Eric W. Biederman authored
      Because it caused a chroot ttyname regression in 2.6.36.
      
      As of 2.6.36 ttyname does not work in a chroot.  It has already been
      reported that screen breaks, and for me this breaks an automated
      distribution testsuite, that I need to preserve the ability to run the
      existing binaries on for several more years.  glibc 2.11.3 which has a
      fix for this is not an option.
      
      The root cause of this breakage is:
      
          commit 8df9d1a4
          Author: Miklos Szeredi <mszeredi@suse.cz>
          Date:   Tue Aug 10 11:41:41 2010 +0200
      
          vfs: show unreachable paths in getcwd and proc
      
          Prepend "(unreachable)" to path strings if the path is not reachable
          from the current root.
      
          Two places updated are
           - the return string from getcwd()
           - and symlinks under /proc/$PID.
      
          Other uses of d_path() are left unchanged (we know that some old
          software crashes if /proc/mounts is changed).
      Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      
      So remove the nice sounding, but ultimately ill advised change to how
      /proc/fd symlinks work.
      Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7b2a69ba
  5. 05 Dec, 2010 4 commits
    • Arnaldo Carvalho de Melo's avatar
      perf tools: Ask for ID PERF_SAMPLE_ info on all PERF_RECORD_ events · 9c90a61c
      Arnaldo Carvalho de Melo authored
      So that we can use -T == --timestamp, asking for PERF_SAMPLE_TIME:
      
        $ perf record -aT
        $ perf report -D | grep PERF_RECORD_
        <SNIP>
         3   5951915425 0x47530 [0x58]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff8138c1a2 period: 215979 cpu:3
         3   5952026879 0x47588 [0x90]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff810cb480 period: 215979 cpu:3
         3   5952059959 0x47618 [0x38]: PERF_RECORD_FORK(6853:6853):(16811:16811)
         3   5952138878 0x47650 [0x78]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff811bac35 period: 431478 cpu:3
         3   5952375068 0x476c8 [0x30]: PERF_RECORD_COMM: find:6853
         3   5952395923 0x476f8 [0x50]: PERF_RECORD_MMAP 6853/6853: [0x400000(0x25000) @ 0]: /usr/bin/find
         3   5952413756 0x47748 [0xa0]: PERF_RECORD_SAMPLE(IP, 1): 6853/6853: 0xffffffff810d080f period: 859332 cpu:3
         3   5952419837 0x477e8 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44600000(0x21d000) @ 0]: /lib64/ld-2.5.so
         3   5952437929 0x47840 [0x48]: PERF_RECORD_MMAP 6853/6853: [0x7fff7e1c9000(0x1000) @ 0x7fff7e1c9000]: [vdso]
         3   5952570127 0x47888 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f46200000(0x218000) @ 0]: /lib64/libselinux.so.1
         3   5952623637 0x478e0 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44a00000(0x356000) @ 0]: /lib64/libc-2.5.so
         3   5952675720 0x47938 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44e00000(0x204000) @ 0]: /lib64/libdl-2.5.so
         3   5952710080 0x47990 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f45a00000(0x246000) @ 0]: /lib64/libsepol.so.1
         3   5952847802 0x479e8 [0x58]: PERF_RECORD_SAMPLE(IP, 1): 6853/6853: 0xffffffff813897f0 period: 1142536 cpu:3
        <SNIP>
      
      First column is the cpu and the second the timestamp.
      
      That way we can investigate problems in the event stream.
      
      If the new perf binary is run on an older kernel, it will disable this feature
      automatically.
      Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Frédéric Weisbecker <fweisbec@gmail.com>
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Stephane Eranian <eranian@google.com>
      LKML-Reference: <1291318772-30880-5-git-send-email-acme@infradead.org>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      9c90a61c
    • Arnaldo Carvalho de Melo's avatar
      perf session: Parse sample earlier · 640c03ce
      Arnaldo Carvalho de Melo authored
      At perf_session__process_event, so that we reduce the number of lines in eache
      tool sample processing routine that now receives a sample_data pointer already
      parsed.
      
      This will also be useful in the next patch, where we'll allow sample the
      identity fields in MMAP, FORK, EXIT, etc, when it will be possible to see (cpu,
      timestamp) just after before every event.
      
      Also validate callchains in perf_session__process_event, i.e. as early as
      possible, and keep a counter of the number of events discarded due to invalid
      callchains, warning the user about it if it happens.
      
      There is an assumption that was kept that all events have the same sample_type,
      that will be dealt with in the future, when this preexisting limitation will be
      removed.
      Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Frédéric Weisbecker <fweisbec@gmail.com>
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Stephane Eranian <eranian@google.com>
      LKML-Reference: <1291318772-30880-4-git-send-email-acme@infradead.org>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      640c03ce
    • Arnaldo Carvalho de Melo's avatar
      perf events: Make sample_type identity fields available in all PERF_RECORD_ events · c980d109
      Arnaldo Carvalho de Melo authored
      If perf_event_attr.sample_id_all is set it will add the PERF_SAMPLE_ identity
      info:
      
      TID, TIME, ID, CPU, STREAM_ID
      
      As a trailer, so that older perf tools can process new files, just ignoring the
      extra payload.
      
      With this its possible to do further analysis on problems in the event stream,
      like detecting reordering of MMAP and FORK events, etc.
      
      V2: Fixup header size in comm, mmap and task processing, as we have to take into
      account different sample_types for each matching event, noticed by Thomas Gleixner.
      
      Thomas also noticed a problem in v2 where if we didn't had space in the buffer we
      wouldn't restore the header size.
      Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Frédéric Weisbecker <fweisbec@gmail.com>
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c980d109
    • Arnaldo Carvalho de Melo's avatar
      perf events: Separate the routines handling the PERF_SAMPLE_ identity fields · 6844c09d
      Arnaldo Carvalho de Melo authored
      Those will be made available in sample like events like MMAP, EXEC, etc in a
      followup patch. So precalculate the extra id header space and have a separate
      routine to fill them up.
      
      V2: Thomas noticed that the id header needs to be precalculated at
      inherit_events too:
      
      LKML-Reference: <alpine.LFD.2.00.1012031245220.2653@localhost6.localdomain6>
      Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Frédéric Weisbecker <fweisbec@gmail.com>
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      LKML-Reference: <1291318772-30880-2-git-send-email-acme@infradead.org>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      6844c09d