The patch titled
report the per-irq statistics on all arches
has been added to the -mm tree. Its filename is
report-the-per-irq-statistics-on-allarches.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: report the per-irq statistics on all arches
From: Ravikiran G Thirumalai <kiran@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/proc_misc.c | 3 ---
1 file changed, 3 deletions(-)
diff -puN fs/proc/proc_misc.c~report-the-per-irq-statistics-on-allarches fs/proc/proc_misc.c
--- a/fs/proc/proc_misc.c~report-the-per-irq-statistics-on-allarches
+++ a/fs/proc/proc_misc.c
@@ -522,11 +522,8 @@ static int show_stat(struct seq_file *p,
}
seq_printf(p, "intr %llu", (unsigned long long)sum);
-#ifndef CONFIG_SMP
- /* Touches too many cache lines on SMP setups */
for (i = 0; i < NR_IRQS; i++)
seq_printf(p, " %u", per_irq_sum[i]);
-#endif
seq_printf(p,
"\nctxt %llu\n"
_
Patches currently in -mm which might be from kiran@xxxxxxxxxxxx are
softlockup-add-a-proc-tuning-parameter.patch
softlockup-add-a-proc-tuning-parameter-fix.patch
report-the-per-irq-statistics-on-allarches.patch
slab-leaks3-default-y.patch
-
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