Messages in this thread Patch in this message | | | Date | Wed, 30 May 2007 10:00:34 -0400 | From | Mathieu Desnoyers <> | Subject | [patch 9/9] Scheduler profiling - Use conditional calls |
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Use conditional calls with lower d-cache hit in optimized version as a condition for scheduler profiling call.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- kernel/profile.c | 4 ++++ kernel/sched.c | 4 +++- 2 files changed, 7 insertions(+), 1 deletion(-)
Index: linux-2.6-lttng/kernel/profile.c =================================================================== --- linux-2.6-lttng.orig/kernel/profile.c 2007-05-30 08:42:29.000000000 -0400 +++ linux-2.6-lttng/kernel/profile.c 2007-05-30 08:45:22.000000000 -0400 @@ -23,6 +23,7 @@ #include <linux/profile.h> #include <linux/highmem.h> #include <linux/mutex.h> +#include <linux/condcall.h> #include <asm/sections.h> #include <asm/semaphore.h> #include <asm/irq_regs.h> @@ -92,6 +93,8 @@ printk(KERN_INFO "kernel profiling enabled (shift: %ld)\n", prof_shift); } + if (prof_on) + BUG_ON(cond_call_arm("profile_on")); return 1; } __setup("profile=", profile_setup); @@ -556,6 +559,7 @@ return 0; out_cleanup: prof_on = 0; + cond_call_disarm("profile_on"); smp_mb(); on_each_cpu(profile_nop, NULL, 0, 1); for_each_online_cpu(cpu) { Index: linux-2.6-lttng/kernel/sched.c =================================================================== --- linux-2.6-lttng.orig/kernel/sched.c 2007-05-30 08:43:02.000000000 -0400 +++ linux-2.6-lttng/kernel/sched.c 2007-05-30 08:45:22.000000000 -0400 @@ -59,6 +59,7 @@ #include <linux/kprobes.h> #include <linux/delayacct.h> #include <linux/reciprocal_div.h> +#include <linux/condcall.h> #include <asm/tlb.h> #include <asm/unistd.h> @@ -2990,7 +2991,8 @@ print_irqtrace_events(prev); dump_stack(); } - profile_hit(SCHED_PROFILING, __builtin_return_address(0)); + cond_call(profile_on, + profile_hit(SCHED_PROFILING, __builtin_return_address(0))); /* * The idle thread is not allowed to schedule! -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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