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authorRavikiran G Thirumalai <kiran@scalex86.org>2007-10-17 02:26:28 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 11:42:49 -0400
commitf13ef7754f724842dbf5ae6d85d0604fff0d1a84 (patch)
treecb2b9d5b9bbe9650df9c8a14871302dd6a5e3193 /fs/proc/proc_misc.c
parentaf49d9248fca6f26cbdb01918334f71d9040df80 (diff)
report the per-irq statistics on all arches
Commit 4004c69ad68dd03733179277280ea2946990ba36 avoids too many remote cpu references while reporting per-irq stats. Since we will not have the same performance penalty of bringing in remote cpu cachelines while reporting per-irq stats anymore, we can now afford to be consistent and report this statistic on all arches, all configs. akpm: affects ia64, alpha and ppc64, mainly. Kiran earlier said: Read to /proc/stat takes: Plain: 2.622832 With speedup patch: 0.013194 With the per-irq stats commented out: 0.008124 So the performance problems which originally caused those architectures to disable this statistic should now be fixed up. Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/proc_misc.c')
-rw-r--r--fs/proc/proc_misc.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 5de7f874d95c..d6dc72c78bc1 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -526,11 +526,8 @@ static int show_stat(struct seq_file *p, void *v)
526 } 526 }
527 seq_printf(p, "intr %llu", (unsigned long long)sum); 527 seq_printf(p, "intr %llu", (unsigned long long)sum);
528 528
529#ifndef CONFIG_SMP
530 /* Touches too many cache lines on SMP setups */
531 for (i = 0; i < NR_IRQS; i++) 529 for (i = 0; i < NR_IRQS; i++)
532 seq_printf(p, " %u", per_irq_sum[i]); 530 seq_printf(p, " %u", per_irq_sum[i]);
533#endif
534 531
535 seq_printf(p, 532 seq_printf(p,
536 "\nctxt %llu\n" 533 "\nctxt %llu\n"