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authorJonathan Corbet <corbet@lwn.net>2011-04-22 11:19:10 -0600
committerIngo Molnar <mingo@elte.hu>2011-04-24 13:18:38 +0200
commit625f2a378e5a10f45fdc37932fc9f8a21676de9e (patch)
tree1bf966a8e65463cdcc313c559533f032657c9dcf /kernel
parentd3bf52e998056a6002b2aecfe1d25486376382ac (diff)
downloadlinux-625f2a378e5a10f45fdc37932fc9f8a21676de9e.tar.bz2
sched: Get rid of lock_depth
Neil Brown pointed out that lock_depth somehow escaped the BKL removal work. Let's get rid of it now. Note that the perf scripting utilities still have a bunch of code for dealing with common_lock_depth in tracepoints; I have left that in place in case anybody wants to use that code with older kernels. Suggested-by: Neil Brown <neilb@suse.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20110422111910.456c0e84@bike.lwn.net Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c1
-rw-r--r--kernel/mutex.c7
-rw-r--r--kernel/sched.c11
-rw-r--r--kernel/sched_debug.c4
-rw-r--r--kernel/trace/trace_kprobe.c1
5 files changed, 1 insertions, 23 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index e7548dee636b..aca62871a4f9 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1103,7 +1103,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
posix_cpu_timers_init(p);
- p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
p->real_start_time = p->start_time;
monotonic_to_bootbased(&p->real_start_time);
diff --git a/kernel/mutex.c b/kernel/mutex.c
index fe4706cb0c5b..2c938e2337cd 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -163,13 +163,6 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
struct task_struct *owner;
/*
- * If we own the BKL, then don't spin. The owner of
- * the mutex might be waiting on us to release the BKL.
- */
- if (unlikely(current->lock_depth >= 0))
- break;
-
- /*
* If there's an owner, wait for it to either
* release the lock or go to sleep.
*/
diff --git a/kernel/sched.c b/kernel/sched.c
index 8cb0a5769a16..9cde2dd229c9 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4121,12 +4121,6 @@ static inline void schedule_debug(struct task_struct *prev)
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
schedstat_inc(this_rq(), sched_count);
-#ifdef CONFIG_SCHEDSTATS
- if (unlikely(prev->lock_depth >= 0)) {
- schedstat_inc(this_rq(), rq_sched_info.bkl_count);
- schedstat_inc(prev, sched_info.bkl_count);
- }
-#endif
}
static void put_prev_task(struct rq *rq, struct task_struct *prev)
@@ -5852,11 +5846,8 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
raw_spin_unlock_irqrestore(&rq->lock, flags);
/* Set the preempt count _outside_ the spinlocks! */
-#if defined(CONFIG_PREEMPT)
- task_thread_info(idle)->preempt_count = (idle->lock_depth >= 0);
-#else
task_thread_info(idle)->preempt_count = 0;
-#endif
+
/*
* The idle tasks have their own, simple scheduling class:
*/
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 3669bec6e130..a6710a112b4f 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -296,9 +296,6 @@ static void print_cpu(struct seq_file *m, int cpu)
P(ttwu_count);
P(ttwu_local);
- SEQ_printf(m, " .%-30s: %d\n", "bkl_count",
- rq->rq_sched_info.bkl_count);
-
#undef P
#undef P64
#endif
@@ -441,7 +438,6 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
P(se.statistics.wait_count);
PN(se.statistics.iowait_sum);
P(se.statistics.iowait_count);
- P(sched_info.bkl_count);
P(se.nr_migrations);
P(se.statistics.nr_migrations_cold);
P(se.statistics.nr_failed_migrations_affine);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 35d55a386145..f925c45f0afa 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -53,7 +53,6 @@ const char *reserved_field_names[] = {
"common_preempt_count",
"common_pid",
"common_tgid",
- "common_lock_depth",
FIELD_STRING_IP,
FIELD_STRING_RETIP,
FIELD_STRING_FUNC,