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authorIngo Molnar <mingo@elte.hu>2006-12-06 20:37:24 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:36 -0800
commitece8a684c75df215320b4155944979e3f78c5c93 (patch)
tree2a65e786dd70ab368c12836a39c36070c0e4974f /include/linux/profile.h
parent70888bd5b70579e278d5ef1b7e1ec6a420d38b9e (diff)
downloadlwn-ece8a684c75df215320b4155944979e3f78c5c93.tar.gz
lwn-ece8a684c75df215320b4155944979e3f78c5c93.zip
[PATCH] sleep profiling
Implement prof=sleep profiling. TASK_UNINTERRUPTIBLE sleeps will be taken as a profile hit, and every millisecond spent sleeping causes a profile-hit for the call site that initiated the sleep. Sample readprofile output on i386: 306 ps2_sendbyte 1.3973 432 call_usermodehelper_keys 1.9548 484 ps2_command 0.6453 790 __driver_attach 4.7879 1593 msleep 44.2500 3976 sync_buffer 64.1290 4076 do_lookup 12.4648 8587 sync_page 122.6714 20820 total 0.0067 (NOTE: architectures need to check whether get_wchan() can be called from deep within the wakeup path.) akpm: we need to mark more functions __sched. lock_sock(), msleep(), others.. akpm: the contention in do_lookup() is a surprise. Presumably doing disk reads for directory contents while holding i_mutex. [akpm@osdl.org: various fixes] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/profile.h')
-rw-r--r--include/linux/profile.h24
1 files changed, 23 insertions, 1 deletions
diff --git a/include/linux/profile.h b/include/linux/profile.h
index acce53fd38b6..5670b340c4ef 100644
--- a/include/linux/profile.h
+++ b/include/linux/profile.h
@@ -6,10 +6,15 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/cpumask.h>
+#include <linux/cache.h>
+
#include <asm/errno.h>
+extern int prof_on __read_mostly;
+
#define CPU_PROFILING 1
#define SCHED_PROFILING 2
+#define SLEEP_PROFILING 3
struct proc_dir_entry;
struct pt_regs;
@@ -18,7 +23,24 @@ struct notifier_block;
/* init basic kernel profiler */
void __init profile_init(void);
void profile_tick(int);
-void profile_hit(int, void *);
+
+/*
+ * Add multiple profiler hits to a given address:
+ */
+void profile_hits(int, void *ip, unsigned int nr_hits);
+
+/*
+ * Single profiler hit:
+ */
+static inline void profile_hit(int type, void *ip)
+{
+ /*
+ * Speedup for the common (no profiling enabled) case:
+ */
+ if (unlikely(prof_on == type))
+ profile_hits(type, ip, 1);
+}
+
#ifdef CONFIG_PROC_FS
void create_prof_cpu_mask(struct proc_dir_entry *);
#else