1. 16 Nov, 2014 11 commits
  2. 12 Nov, 2014 1 commit
  3. 07 Nov, 2014 1 commit
  4. 06 Nov, 2014 4 commits
  5. 05 Nov, 2014 6 commits
    • Namhyung Kim's avatar
      perf tools: Make vmlinux short name more like kallsyms short name · 96d78059
      Namhyung Kim authored
      The previous patch changed kernel dso name from '[kernel.kallsyms]' to
      vmlinux.  However it might add confusion to old users accustomed to the
      old name.  So change the short name to '[kernel.vmlinux]' to reduce such
      confusion.
      
      Before:
        # Overhead  Command         Shared Object            Symbol
        # ........  ..............  .......................  ...............................
        #
             9.83%  swapper         vmlinux                  [k] intel_idle
             4.10%  awk             libc-2.20.so             [.] __strcmp_sse2
             1.86%  sed             libc-2.20.so             [.] __strcmp_sse2
             1.78%  netctl-auto     libc-2.20.so             [.] __strcmp_sse2
             1.23%  netctl-auto     libc-2.20.so             [.] __mbrtowc
             1.21%  firefox         libxul.so                [.] 0x00000000024b62bd
             1.20%  swapper         vmlinux                  [k] cpuidle_enter_state
             1.03%  sleep           vmlinux                  [k] copy_user_generic_unrolled
      
      After:
        # Overhead  Command         Shared Object            Symbol
        # ........  ..............  .......................  ...............................
        #
             9.83%  swapper         [kernel.vmlinux]         [k] intel_idle
             4.10%  awk             libc-2.20.so             [.] __strcmp_sse2
             1.86%  sed             libc-2.20.so             [.] __strcmp_sse2
             1.78%  netctl-auto     libc-2.20.so             [.] __strcmp_sse2
             1.23%  netctl-auto     libc-2.20.so             [.] __mbrtowc
             1.21%  firefox         libxul.so                [.] 0x00000000024b62bd
             1.20%  swapper         [kernel.vmlinux]         [k] cpuidle_enter_state
             1.03%  sleep           [kernel.vmlinux]         [k] copy_user_generic_unrolled
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-9-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      96d78059
    • Namhyung Kim's avatar
      perf tools: Fix build-id matching on vmlinux · b837a8bd
      Namhyung Kim authored
      There's a problem on finding correct kernel symbols when perf report
      runs on a different kernel.  Although a part of the problem was solved
      by the prior commit 0a7e6d1b ("perf tools: Check recorded kernel
      version when finding vmlinux"), there's a remaining problem still.
      
      When perf records samples, it synthesizes the kernel map using
      machine__mmap_name() and ref_reloc_sym like "[kernel.kallsyms]_text".
      You can easily see it using 'perf report -D' command.
      
      After finishing record, it goes through the recorded events to find
      maps/dsos actually used.  And then record build-id info of them.
      
      During this process, it needs to load symbols in a dso and it'd call
      dso__load_vmlinux_path() since the default value of the symbol_conf.
      try_vmlinux_path is true.  However it changes dso->long_name to a real
      path of the vmlinux file (e.g. /lib/modules/3.16.4/build/vmlinux) if one
      is running on a custom kernel.
      
      It resulted in that perf report reads the build-id of the vmlinux, but
      cannot use it since it only knows about the [kernel.kallsyms] map.  It
      then falls back to possible vmlinux paths by using the recorded kernel
      version (in case of a recent version) or a running kernel silently.
      
      Even with the recent tools, this still has a possibility of breaking
      the result.  As the build directory is a symbolic link, if one built a
      new kernel in the same directory with different source/config, the old
      link to vmlinux will point the new file.  So it's absolutely needed to
      use build-id when finding a kernel image.
      
      In this patch, it's now changed to try to search a kernel dso in the
      existing dso list which was constructed during build-id table parsing
      so it'll always have a build-id.  If not found, search "[kernel.kallsyms]".
      
      Before:
      
        $ perf report
        # Children      Self  Command  Shared Object      Symbol
        # ........  ........  .......  .................  ...............................
        #
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] set_curr_task_rt
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] native_calibrate_tsc
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] tsc_refine_calibration_work
            71.87%    71.87%  swapper  [kernel.kallsyms]  [k] module_finalize
         ...
      
      After (for the same perf.data):
      
            72.15%     0.00%  swapper  vmlinux  [k] cpu_startup_entry
            72.15%     0.00%  swapper  vmlinux  [k] arch_cpu_idle
            72.15%     0.00%  swapper  vmlinux  [k] default_idle
            71.87%    71.87%  swapper  vmlinux  [k] native_safe_halt
         ...
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Link: http://lkml.kernel.org/r/20140924073356.GB1962@gmail.com
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-8-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      b837a8bd
    • Namhyung Kim's avatar
      perf record: Do not save pathname in ./debug/.build-id directory for vmlinux · 00dc8657
      Namhyung Kim authored
      When perf record finishes a session, it pre-processes samples in order
      to write build-id info from DSOs that had samples.
      
      During this process it'll call map__load() for the kernel map, and it
      ends up calling dso__load_vmlinux_path() which replaces dso->long_name.
      
      But this function checks kernel's build-id before searching vmlinux path
      so it'll end up with a cryptic name, the pathname for the entry in the
      ~/.debug cache, which can be confusing to users.
      
      This patch adds a flag to skip the build-id check during record, so
      that it'll have the original vmlinux path for the kernel dso->long_name,
      not the entry in the ~/.debug cache.
      
      Before:
        # perf record -va sleep 3
        mmap size 528384B
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 0.196 MB perf.data (~8545 samples) ]
        Looking at the vmlinux_path (7 entries long)
        Using /home/namhyung/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 for symbols
      
      After:
        # perf record -va sleep 3
        mmap size 528384B
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 0.193 MB perf.data (~8432 samples) ]
        Looking at the vmlinux_path (7 entries long)
        Using /lib/modules/3.16.4-1-ARCH/build/vmlinux for symbols
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-7-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      00dc8657
    • Namhyung Kim's avatar
      perf build-id: Move build-id related functions to util/build-id.c · e195fac8
      Namhyung Kim authored
      It'd be better managing those functions in a separate place as
      util/header.c file is already big.
      
      It now exports following 3 functions to others:
      
        bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
        int perf_session__write_buildid_table(struct perf_session *session, int fd);
        int perf_session__cache_build_ids(struct perf_session *session);
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
      Link: http://lkml.kernel.org/r/545733E7.6010105@intel.com
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-5-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      e195fac8
    • Namhyung Kim's avatar
      perf build-id: Rename dsos__write_buildid_table() · 714c9c4a
      Namhyung Kim authored
      The dsos__write_buildid_table() is not use struct dso and it mostly
      uses perf_session struct.
      
      So rename it to perf_session__write_buildid_ table() so that it
      corresponds to other related functions such as
      perf_session__read_build_ids() and perf_session__cache_build_ids().
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-4-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      714c9c4a
    • Namhyung Kim's avatar
      perf tools: Add gzip decompression support for kernel module · e92ce12e
      Namhyung Kim authored
      Now my Archlinux box shows module symbols correctly.
      
      Before:
        $ perf report --stdio
        Failed to open /tmp/perf-3477.map, continuing without symbols
        no symbols found in /usr/bin/date, maybe install a debug package?
        No kallsyms or vmlinux with build-id 7b4ea0a49ae2111925857099aaf05c3246ff33e0 was found
        [drm] with build id 7b4ea0a49ae2111925857099aaf05c3246ff33e0 not found, continuing without symbols
        No kallsyms or vmlinux with build-id edd931629094b660ca9dec09a1b635c8d87aa2ee was found
        [jbd2] with build id edd931629094b660ca9dec09a1b635c8d87aa2ee not found, continuing without symbols
        No kallsyms or vmlinux with build-id a7b1eada671c34933e5610bb920b2ca4945a82c3 was found
        [ext4] with build id a7b1eada671c34933e5610bb920b2ca4945a82c3 not found, continuing without symbols
        No kallsyms or vmlinux with build-id d69511fa3e5840e770336ef45b06c83fef8d74e3 was found
        [scsi_mod] with build id d69511fa3e5840e770336ef45b06c83fef8d74e3 not found, continuing without symbols
        No kallsyms or vmlinux with build-id af0430af13461af058770ee9b87afc07922c2e77 was found
        [libata] with build id af0430af13461af058770ee9b87afc07922c2e77 not found, continuing without symbols
        No kallsyms or vmlinux with build-id aaeedff8160ce631a5f0333591c6ff291201d29f was found
        [libahci] with build id aaeedff8160ce631a5f0333591c6ff291201d29f not found, continuing without symbols
        No kallsyms or vmlinux with build-id c57907712becaf662dc4981824bb372c0441d605 was found
        [mac80211] with build id c57907712becaf662dc4981824bb372c0441d605 not found, continuing without symbols
        No kallsyms or vmlinux with build-id e0589077cc0ec8c3e4c40eb9f2d9e69d236bee8f was found
        [iwldvm] with build id e0589077cc0ec8c3e4c40eb9f2d9e69d236bee8f not found, continuing without symbols
        No kallsyms or vmlinux with build-id 2d86086bf136bf374a2f029cf85a48194f9b950b was found
        [cfg80211] with build id 2d86086bf136bf374a2f029cf85a48194f9b950b not found, continuing without symbols
        No kallsyms or vmlinux with build-id 4493c48599bdb3d91d0f8db5150e0be33fdd9221 was found
        [iwlwifi] with build id 4493c48599bdb3d91d0f8db5150e0be33fdd9221 not found, continuing without symbols
        ...
        #
        # Overhead  Command          Shared Object            Symbol
        # ........  ...............  .......................  ........................................................
        #
             0.03%  swapper          [ext4]                   [k] 0x000000000000fe2e
             0.03%  swapper          [kernel.kallsyms]        [k] account_entity_enqueue
             0.03%  swapper          [ext4]                   [k] 0x000000000000fc2b
             0.03%  irq/50-iwlwifi   [iwlwifi]                [k] 0x000000000000200b
             0.03%  swapper          [kernel.kallsyms]        [k] ktime_add_safe
             0.03%  swapper          [kernel.kallsyms]        [k] elv_completed_request
             0.03%  swapper          [libata]                 [k] 0x0000000000003997
             0.03%  swapper          [libahci]                [k] 0x0000000000001f25
             0.03%  swapper          [kernel.kallsyms]        [k] rb_next
             0.03%  swapper          [kernel.kallsyms]        [k] blk_finish_request
             0.03%  swapper          [ext4]                   [k] 0x0000000000010248
             0.00%  perf             [kernel.kallsyms]        [k] native_write_msr_safe
      
      After:
        $ perf report --stdio
        Failed to open /tmp/perf-3477.map, continuing without symbols
        no symbols found in /usr/bin/tr, maybe install a debug package?
        ...
        #
        # Overhead  Command          Shared Object                Symbol
        # ........  ...............  ...........................  ......................................................
        #
      
             0.04%  kworker/u16:3    [ext4]                       [k] ext4_read_block_bitmap
             0.03%  kworker/u16:0    [mac80211]                   [k] ieee80211_sta_reset_beacon_monitor
             0.02%  irq/50-iwlwifi   [mac80211]                   [k] ieee80211_get_bssid
             0.02%  firefox          [e1000e]                     [k] __ew32_prepare
             0.02%  swapper          [libahci]                    [k] ahci_handle_port_interrupt
             0.02%  emacs            libglib-2.0.so.0.4000.0      [.] g_mutex_unlock
             0.02%  swapper          [e1000e]                     [k] e1000_clean_tx_irq
             0.02%  dwm              [kernel.kallsyms]            [k] __schedule
             0.02%  gnome-terminal-  [vdso]                       [.] __vdso_clock_gettime
             0.02%  swapper          [e1000e]                     [k] e1000_alloc_rx_buffers
             0.02%  irq/50-iwlwifi   [mac80211]                   [k] ieee80211_rx
             0.01%  firefox          [vdso]                       [.] __vdso_gettimeofday
             0.01%  irq/50-iwlwifi   [iwlwifi]                    [k] iwl_pcie_rxq_restock.part.13
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/87h9yexshi.fsf@sejong.aot.lge.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      e92ce12e
  6. 04 Nov, 2014 4 commits
  7. 03 Nov, 2014 10 commits
  8. 02 Nov, 2014 3 commits
    • Linus Torvalds's avatar
      Linux 3.18-rc3 · 0df1f248
      Linus Torvalds authored
      0df1f248
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20141102' of git://git.infradead.org/linux-mtd · 81d92dc1
      Linus Torvalds authored
      Pull MTD fixes from Brian Norris:
       "Three main MTD fixes for 3.18:
      
         - A regression from 3.16 which was noticed in 3.17.  With the
           restructuring of the m25p80.c driver and the SPI NOR library
           framework, we omitted proper listing of the SPI device IDs.  This
           means m25p80.c wouldn't auto-load (modprobe) properly when built as
           a module.  For now, we duplicate the device IDs into both modules.
      
         - The OMAP / ELM modules were depending on an implicit link ordering.
           Use deferred probing so that the new link order (in 3.18-rc) can
           still allow for successful probing.
      
         - Fix suspend/resume support for LH28F640BF NOR flash"
      
      * tag 'for-linus-20141102' of git://git.infradead.org/linux-mtd:
        mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips
        mtd: omap: fix mtd devices not showing up
        mtd: m25p80,spi-nor: Fix module aliases for m25p80
        mtd: spi-nor: make spi_nor_scan() take a chip type name, not spi_device_id
        mtd: m25p80: get rid of spi_get_device_id
      81d92dc1
    • Linus Torvalds's avatar
      Merge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · ad2be379
      Linus Torvalds authored
      Pull SCSI fixes from James Bottomley:
       "This is a set of six patches consisting of:
         - two MAINTAINER updates
         - two scsi-mq fixs for the old parallel interface (not every request
           is tagged and we need to set the right flags to populate the SPI
           tag message)
         - a fix for a memory leak in scatterlist traversal caused by a
           preallocation update in 3.17
         - an ipv6 fix for cxgbi"
      
      [ The scatterlist fix also came in separately through the block layer tree ]
      
      * tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        MAINTAINERS: ufs - remove self
        MAINTAINERS: change hpsa and cciss maintainer
        libcxgbi : support ipv6 address host_param
        scsi: set REQ_QUEUE for the blk-mq case
        Revert "block: all blk-mq requests are tagged"
        lib/scatterlist: fix memory leak with scsi-mq
      ad2be379