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Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (244 commits)
  Revert "x86, bts: reenable ptrace branch trace support"
  tracing: do not translate event helper macros in print format
  ftrace/documentation: fix typo in function grapher name
  tracing/events: convert block trace points to TRACE_EVENT(), fix !CONFIG_BLOCK
  tracing: add protection around module events unload
  tracing: add trace_seq_vprint interface
  tracing: fix the block trace points print size
  tracing/events: convert block trace points to TRACE_EVENT()
  ring-buffer: fix ret in rb_add_time_stamp
  ring-buffer: pass in lockdep class key for reader_lock
  tracing: add annotation to what type of stack trace is recorded
  tracing: fix multiple use of __print_flags and __print_symbolic
  tracing/events: fix output format of user stack
  tracing/events: fix output format of kernel stack
  tracing/trace_stack: fix the number of entries in the header
  ring-buffer: discard timestamps that are at the start of the buffer
  ring-buffer: try to discard unneeded timestamps
  ring-buffer: fix bug in ring_buffer_discard_commit
  ftrace: do not profile functions when disabled
  tracing: make trace pipe recognize latency format flag
  ...
This commit is contained in:
Linus Torvalds 2009-06-10 19:53:40 -07:00
commit 8623661180
130 changed files with 8926 additions and 2919 deletions
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55
kernel/sched.c
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@ -72,13 +72,15 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
#include <trace/sched.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
#include "sched_cpupri.h"
#define CREATE_TRACE_POINTS
#include <trace/events/sched.h>
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@ -118,12 +120,6 @@
*/
#define RUNTIME_INF ((u64)~0ULL)
DEFINE_TRACE(sched_wait_task);
DEFINE_TRACE(sched_wakeup);
DEFINE_TRACE(sched_wakeup_new);
DEFINE_TRACE(sched_switch);
DEFINE_TRACE(sched_migrate_task);
#ifdef CONFIG_SMP
static void double_rq_lock(struct rq *rq1, struct rq *rq2);
@ -1964,7 +1960,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
clock_offset = old_rq->clock - new_rq->clock;
trace_sched_migrate_task(p, task_cpu(p), new_cpu);
trace_sched_migrate_task(p, new_cpu);
#ifdef CONFIG_SCHEDSTATS
if (p->se.wait_start)
@ -2020,6 +2016,49 @@ migrate_task(struct task_struct *p, int dest_cpu, struct migration_req *req)
return 1;
}
/*
* wait_task_context_switch - wait for a thread to complete at least one
* context switch.
*
* @p must not be current.
*/
void wait_task_context_switch(struct task_struct *p)
{
unsigned long nvcsw, nivcsw, flags;
int running;
struct rq *rq;
nvcsw = p->nvcsw;
nivcsw = p->nivcsw;
for (;;) {
/*
* The runqueue is assigned before the actual context
* switch. We need to take the runqueue lock.
*
* We could check initially without the lock but it is
* very likely that we need to take the lock in every
* iteration.
*/
rq = task_rq_lock(p, &flags);
running = task_running(rq, p);
task_rq_unlock(rq, &flags);
if (likely(!running))
break;
/*
* The switch count is incremented before the actual
* context switch. We thus wait for two switches to be
* sure at least one completed.
*/
if ((p->nvcsw - nvcsw) > 1)
break;
if ((p->nivcsw - nivcsw) > 1)
break;
cpu_relax();
}
}
/*
* wait_task_inactive - wait for a thread to unschedule.
*