How do cpu-freq related stuff find its way into mainline? Is there a GIT repository/branch on <git.kernel.org> where you can pull from? - Sedat - On Wed, Jun 16, 2010 at 10:42 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 9 Jun 2010 11:22:35 +0200 > "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: > >> On Wednesday 09 June 2010, Sedat Dilek wrote: >> > The patch from [1] is still missing. >> > >> > "cpufreq-call-nr_iowait_cpu-with-disabled-preemption.patch" from >> > Dmitry Monakhoc >> > >> > Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> >> > Tested-by Maciej Rutecki <maciej.rutecki@xxxxxxxxx> >> > >> > I have already reported this issue on LKML [2] and cpufreq ML [3]. >> > >> > - Sedat - >> > >> > [1] http://www.spinics.net/lists/cpufreq/msg01631.html >> > [2] http://lkml.org/lkml/2010/5/31/77 >> > [3] http://www.spinics.net/lists/cpufreq/msg01637.html >> >> Thanks, added. > > I just merged a different patch whcih should address this: > > > From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> > > Fix > > BUG: using smp_processor_id() in preemptible [00000000] code: s2disk/3392 > caller is nr_iowait_cpu+0xe/0x1e > Pid: 3392, comm: s2disk Not tainted 2.6.35-rc3-dbg-00106-ga75e02b #2 > Call Trace: > [<c1184c55>] debug_smp_processor_id+0xa5/0xbc > [<c10282a5>] nr_iowait_cpu+0xe/0x1e > [<c104ab7c>] update_ts_time_stats+0x32/0x6c > [<c104ac73>] get_cpu_idle_time_us+0x36/0x58 > [<c124229b>] get_cpu_idle_time+0x12/0x74 > [<c1242963>] cpufreq_governor_dbs+0xc3/0x2dc > [<c1240437>] __cpufreq_governor+0x51/0x85 > [<c1241190>] __cpufreq_set_policy+0x10c/0x13d > [<c12413d3>] cpufreq_add_dev_interface+0x212/0x233 > [<c1241b1e>] ? handle_update+0x0/0xd > [<c1241a18>] cpufreq_add_dev+0x34b/0x35a > [<c103c973>] ? schedule_delayed_work_on+0x11/0x13 > [<c12c14db>] cpufreq_cpu_callback+0x59/0x63 > [<c1042f39>] notifier_call_chain+0x26/0x48 > [<c1042f7d>] __raw_notifier_call_chain+0xe/0x10 > [<c102efb9>] __cpu_notify+0x15/0x29 > [<c102efda>] cpu_notify+0xd/0xf > [<c12bfb30>] _cpu_up+0xaf/0xd2 > [<c12b3ad4>] enable_nonboot_cpus+0x3d/0x94 > [<c1055eef>] hibernation_snapshot+0x104/0x1a2 > [<c1058b49>] snapshot_ioctl+0x24b/0x53e > [<c1028ad1>] ? sub_preempt_count+0x7c/0x89 > [<c10ab91d>] vfs_ioctl+0x2e/0x8c > [<c10588fe>] ? snapshot_ioctl+0x0/0x53e > [<c10ac2c7>] do_vfs_ioctl+0x42f/0x45a > [<c10a0ba5>] ? fsnotify_modify+0x4f/0x5a > [<c11e9dc3>] ? tty_write+0x0/0x1d0 > [<c10a12d6>] ? vfs_write+0xa2/0xda > [<c10ac333>] sys_ioctl+0x41/0x62 > [<c10027d3>] sysenter_do_call+0x12/0x2d > > The initial fix was to use get_cpu/put_cpu in nr_iowait_cpu. However, > Arjan stated that "the bug is that it needs to be nr_iowait_cpu(int cpu)". > > This patch introduces nr_iowait_cpu(int cpu) and changes to it callers. > > akpm: addresses about 30,000,000 different bug reports. > > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> > Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxx> > Cc: "Rafael J. Wysocki" <rjw@xxxxxxx> > Cc: Maxim Levitsky <maximlevitsky@xxxxxxxxx> > Cc: Len Brown <len.brown@xxxxxxxxx> > Cc: Pavel Machek <pavel@xxxxxx> > Cc: Jiri Slaby <jslaby@xxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > --- > > drivers/cpuidle/governors/menu.c | 10 ++++++++-- > include/linux/sched.h | 2 +- > kernel/sched.c | 4 ++-- > kernel/time/tick-sched.c | 4 +++- > 4 files changed, 14 insertions(+), 6 deletions(-) > > diff -puN drivers/cpuidle/governors/menu.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu drivers/cpuidle/governors/menu.c > --- a/drivers/cpuidle/governors/menu.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu > +++ a/drivers/cpuidle/governors/menu.c > @@ -137,15 +137,18 @@ static inline int which_bucket(unsigned > { > int bucket = 0; > > + int cpu = get_cpu(); > /* > * We keep two groups of stats; one with no > * IO pending, one without. > * This allows us to calculate > * E(duration)|iowait > */ > - if (nr_iowait_cpu()) > + if (nr_iowait_cpu(cpu)) > bucket = BUCKETS/2; > > + put_cpu(); > + > if (duration < 10) > return bucket; > if (duration < 100) > @@ -169,13 +172,16 @@ static inline int which_bucket(unsigned > static inline int performance_multiplier(void) > { > int mult = 1; > + int cpu = get_cpu(); > > /* for higher loadavg, we are more reluctant */ > > mult += 2 * get_loadavg(); > > /* for IO wait tasks (per cpu!) we add 5x each */ > - mult += 10 * nr_iowait_cpu(); > + mult += 10 * nr_iowait_cpu(cpu); > + > + put_cpu(); > > return mult; > } > diff -puN include/linux/sched.h~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu include/linux/sched.h > --- a/include/linux/sched.h~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu > +++ a/include/linux/sched.h > @@ -139,7 +139,7 @@ extern int nr_processes(void); > extern unsigned long nr_running(void); > extern unsigned long nr_uninterruptible(void); > extern unsigned long nr_iowait(void); > -extern unsigned long nr_iowait_cpu(void); > +extern unsigned long nr_iowait_cpu(int cpu); > extern unsigned long this_cpu_load(void); > > > diff -puN kernel/sched.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu kernel/sched.c > --- a/kernel/sched.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu > +++ a/kernel/sched.c > @@ -2864,9 +2864,9 @@ unsigned long nr_iowait(void) > return sum; > } > > -unsigned long nr_iowait_cpu(void) > +unsigned long nr_iowait_cpu(int cpu) > { > - struct rq *this = this_rq(); > + struct rq *this = cpu_rq(cpu); > return atomic_read(&this->nr_iowait); > } > > diff -puN kernel/time/tick-sched.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu kernel/time/tick-sched.c > --- a/kernel/time/tick-sched.c~cpuidle-avoid-using-smp_processor_id-in-preemptible-code-nr_iowait_cpu > +++ a/kernel/time/tick-sched.c > @@ -159,10 +159,12 @@ update_ts_time_stats(struct tick_sched * > ktime_t delta; > > if (ts->idle_active) { > + int cpu = get_cpu(); > delta = ktime_sub(now, ts->idle_entrytime); > ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); > - if (nr_iowait_cpu() > 0) > + if (nr_iowait_cpu(cpu) > 0) > ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta); > + put_cpu(); > ts->idle_entrytime = now; > } > > _ > > -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
