Eric Lee / smarc-fsl-linux-kernel

13 Sep, 2011

1 commit

  • 2737c49f2   locking, timer_stats: Annotate table_lock as raw ... Browse Code »

    The table_lock lock can be taken in atomic context and therefore
    cannot be preempted on -rt - annotate it.

    In mainline this change documents the low level nature of
    the lock - otherwise there's no functional difference. Lockdep
    and Sparse checking will work as usual.

    Reported-by: Andreas Sundebo
    Signed-off-by: Thomas Gleixner
    Tested-by: Andreas Sundebo

    Signed-off-by: Ingo Molnar

    Thomas Gleixner
     

31 Mar, 2011

1 commit

15 Dec, 2009

1 commit

29 Oct, 2009

1 commit

  • 1871e52c7   percpu: make percpu symbols under kernel/ and mm/ unique ... Browse Code »

    This patch updates percpu related symbols under kernel/ and mm/ such
    that percpu symbols are unique and don't clash with local symbols.
    This serves two purposes of decreasing the possibility of global
    percpu symbol collision and allowing dropping per_cpu__ prefix from
    percpu symbols.

    * kernel/lockdep.c: s/lock_stats/cpu_lock_stats/

    * kernel/sched.c: s/init_rq_rt/init_rt_rq_var/ (any better idea?)
    s/sched_group_cpus/sched_groups/

    * kernel/softirq.c: s/ksoftirqd/run_ksoftirqd/a

    * kernel/softlockup.c: s/(*)_timestamp/softlockup_\1_ts/
    s/watchdog_task/softlockup_watchdog/
    s/timestamp/ts/ for local variables

    * kernel/time/timer_stats: s/lookup_lock/tstats_lookup_lock/

    * mm/slab.c: s/reap_work/slab_reap_work/
    s/reap_node/slab_reap_node/

    * mm/vmstat.c: local variable changed to avoid collision with vmstat_work

    Partly based on Rusty Russell's "alloc_percpu: rename percpu vars
    which cause name clashes" patch.

    Signed-off-by: Tejun Heo
    Acked-by: (slab/vmstat) Christoph Lameter
    Reviewed-by: Christoph Lameter
    Cc: Rusty Russell
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: Andrew Morton
    Cc: Nick Piggin

    Tejun Heo
     

02 Oct, 2009

1 commit

24 Jun, 2009

1 commit

  • 507e12315   timer stats: Optimize by adding quick check to avoid function calls ... Browse Code »

    When the kernel is configured with CONFIG_TIMER_STATS but timer
    stats are runtime disabled we still get calls to
    __timer_stats_timer_set_start_info which initializes some
    fields in the corresponding struct timer_list.

    So add some quick checks in the the timer stats setup functions
    to avoid function calls to __timer_stats_timer_set_start_info
    when timer stats are disabled.

    In an artificial workload that does nothing but playing ping
    pong with a single tcp packet via loopback this decreases cpu
    consumption by 1 - 1.5%.

    This is part of a modified function trace output on SLES11:

    perl-2497 [00] 28630647177732388 [+ 125]: sk_reset_timer
    Cc: Andrew Morton
    Cc: Martin Schwidefsky
    Cc: Mustafa Mesanovic
    Cc: Arjan van de Ven
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Heiko Carstens
     

29 Apr, 2008

1 commit

30 Jan, 2008

1 commit

08 Oct, 2007

1 commit

  • 74922be14   Fix timer_stats printout of events/sec ... Browse Code »

    When using /proc/timer_stats on ppc64 I noticed the events/sec field wasnt
    accurate. Sometimes the integer part was incorrect due to rounding (we
    werent taking the fractional seconds into consideration).

    The fraction part is also wrong, we need to pad the printf statement and
    take the bottom three digits of 1000 times the value.

    Signed-off-by: Anton Blanchard
    Acked-by: Ingo Molnar
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Anton Blanchard
     

01 Aug, 2007

1 commit

18 Jul, 2007

1 commit

  • 9281acea6   kallsyms: make KSYM_NAME_LEN include space for trailing '\0' ... Browse Code »

    KSYM_NAME_LEN is peculiar in that it does not include the space for the
    trailing '\0', forcing all users to use KSYM_NAME_LEN + 1 when allocating
    buffer. This is nonsense and error-prone. Moreover, when the caller
    forgets that it's very likely to subtly bite back by corrupting the stack
    because the last position of the buffer is always cleared to zero.

    This patch increments KSYM_NAME_LEN by one and updates code accordingly.

    * off-by-one bug in asm-powerpc/kprobes.h::kprobe_lookup_name() macro
    is fixed.

    * Where MODULE_NAME_LEN and KSYM_NAME_LEN were used together,
    MODULE_NAME_LEN was treated as if it didn't include space for the
    trailing '\0'. Fix it.

    Signed-off-by: Tejun Heo
    Acked-by: Paulo Marques
    Cc: Benjamin Herrenschmidt
    Cc: Paul Mackerras
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tejun Heo
     

17 Jul, 2007

1 commit

  • c5c061b8f   Add a flag to indicate deferrable timers in /proc/timer_stats ... Browse Code »

    Add a flag in /proc/timer_stats to indicate deferrable timers. This will
    let developers/users to differentiate between types of tiemrs in
    /proc/timer_stats.

    Deferrable timer and normal timer will appear in /proc/timer_stats as below.
    10D, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)
    10, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)

    Also version of timer_stats changes from v0.1 to v0.2

    Signed-off-by: Venkatesh Pallipadi
    Acked-by: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: john stultz
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Venki Pallipadi
     

01 Jun, 2007

2 commits

  • c1a834dc7   timer stats: speedups ... Browse Code »

    Make timer-stats have almost zero overhead when enabled in the config but
    not used. (this way distros can enable it more easily)

    Also update the documentation about overhead of timer_stats - it was
    written for the first version which had a global lock and a linear list
    walk based lookup ;-)

    Signed-off-by: Ingo Molnar
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo Molnar
     
  • 9fcc15ec3   timer statistics: fix race ... Browse Code »

    Fix two races in the timer stats lookup code. One by ensuring that the
    initialization of a new entry is finished upon insertion of that entry.
    The other by cleaning up the hash table when the entries array is cleared,
    so that we don't have any "pre-inserted" entries.

    Thanks to Eric Dumazet for reminding me of the memory barriers.

    Signed-off-by: Bjorn Steinbrink
    Signed-off-by: Ian Kumlien
    Acked-by: Ingo Molnar
    Cc: Eric Dumazet
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Bjorn Steinbrink
     

09 May, 2007

2 commits

  • 9d65cb4a1   Fix race between cat /proc/*/wchan and rmmod et al ... Browse Code »

    kallsyms_lookup() can go iterating over modules list unprotected which is OK
    for emergency situations (oops), but not OK for regular stuff like
    /proc/*/wchan.

    Introduce lookup_symbol_name()/lookup_module_symbol_name() which copy symbol
    name into caller-supplied buffer or return -ERANGE. All copying is done with
    module_mutex held, so...

    Signed-off-by: Alexey Dobriyan
    Cc: Rusty Russell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     
  • ffb451227   Simplify kallsyms_lookup() ... Browse Code »

    Several kallsyms_lookup() pass dummy arguments but only need, say, module's
    name. Make kallsyms_lookup() accept NULLs where possible.

    Also, makes picture clearer about what interfaces are needed for all symbol
    resolving business.

    Signed-off-by: Alexey Dobriyan
    Cc: Rusty Russell
    Acked-by: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

17 Feb, 2007

1 commit

  • 82f67cd9f   [PATCH] Add debugging feature /proc/timer_stat ... Browse Code »

    Add /proc/timer_stats support: debugging feature to profile timer expiration.
    Both the starting site, process/PID and the expiration function is captured.
    This allows the quick identification of timer event sources in a system.

    Sample output:

    # echo 1 > /proc/timer_stats
    # cat /proc/timer_stats
    Timer Stats Version: v0.1
    Sample period: 4.010 s
    24, 0 swapper hrtimer_stop_sched_tick (hrtimer_sched_tick)
    11, 0 swapper sk_reset_timer (tcp_delack_timer)
    6, 0 swapper hrtimer_stop_sched_tick (hrtimer_sched_tick)
    2, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)
    17, 0 swapper hrtimer_restart_sched_tick (hrtimer_sched_tick)
    2, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)
    4, 2050 pcscd do_nanosleep (hrtimer_wakeup)
    5, 4179 sshd sk_reset_timer (tcp_write_timer)
    4, 2248 yum-updatesd schedule_timeout (process_timeout)
    18, 0 swapper hrtimer_restart_sched_tick (hrtimer_sched_tick)
    3, 0 swapper sk_reset_timer (tcp_delack_timer)
    1, 1 swapper neigh_table_init_no_netlink (neigh_periodic_timer)
    2, 1 swapper e1000_up (e1000_watchdog)
    1, 1 init schedule_timeout (process_timeout)
    100 total events, 25.24 events/sec

    [ cleanups and hrtimers support from Thomas Gleixner ]
    [bunk@stusta.de: nr_entries can become static]
    Signed-off-by: Ingo Molnar
    Signed-off-by: Thomas Gleixner
    Cc: john stultz
    Cc: Roman Zippel
    Cc: Andi Kleen
    Signed-off-by: Adrian Bunk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo Molnar