The patch titled
sched: fix migration cost estimator
has been added to the -mm tree. Its filename is
sched-fix-migration-cost-estimator.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: sched: fix migration cost estimator
From: Ingo Molnar <mingo@xxxxxxx>
Bela found the following bug: touch_cache() only touched 2 thirds of the cache
buffer (hence wasting memory and possibly making calibration less accurate).
Fixes http://bugzilla.kernel.org/show_bug.cgi?id=7476
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Bela Lubkin <blubkin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sched.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff -puN kernel/sched.c~sched-fix-migration-cost-estimator kernel/sched.c
--- a/kernel/sched.c~sched-fix-migration-cost-estimator
+++ a/kernel/sched.c
@@ -5721,14 +5721,24 @@ static void touch_cache(void *__cache, u
unsigned long *cache = __cache;
int i;
+ /*
+ * We access the buffer via 6 independent 'streams' of
+ * read/write access which are interleaved:
+ *
+ * [---> <---|---> <---|---> <---]
+ *
+ * We touch every cacheline in the buffer. (iteration
+ * step is 32 bytes on 32-bit systems, 64 bytes on
+ * 64-bit systems)
+ */
for (i = 0; i < size/6; i += 8) {
- switch (i % 6) {
- case 0: cache[i]++;
- case 1: cache[size-1-i]++;
- case 2: cache[chunk1-i]++;
- case 3: cache[chunk1+i]++;
- case 4: cache[chunk2-i]++;
- case 5: cache[chunk2+i]++;
+ switch (i % 6*8) {
+ case 0*8: cache[i]++;
+ case 1*8: cache[size-1-i]++;
+ case 2*8: cache[chunk1-i]++;
+ case 3*8: cache[chunk1+i]++;
+ case 4*8: cache[chunk2-i]++;
+ case 5*8: cache[chunk2+i]++;
}
}
}
_
Patches currently in -mm which might be from mingo@xxxxxxx are
bonding-lockdep-annotation.patch
lockdep-annotate-nfs-nfsd-in-kernel-sockets.patch
lockdep-annotate-nfs-nfsd-in-kernel-sockets-tidy.patch
sysrq-x-show-blocked-tasks.patch
setup_irq-better-mismatch-debugging.patch
lockdep-internal-locking-fixes.patch
lockdep-misc-fixes-in-lockdepc.patch
cpuset-remove-sched-domain-hooks-from-cpusets.patch
binfmt_elf-randomize-pie-binaries.patch
enforce-unsigned-long-flags-when-spinlocking.patch
disable-clone_child_cleartid-for-abnormal-exit.patch
lockdep-spin_lock_irqsave_nested.patch
lockdep-spin_lock_irqsave_nested-fix.patch
lockdep-spin_lock_irqsave_nested-fix-2.patch
lockdep-annotate-bcsp-driver.patch
lockdep-print-current-locks-on-in_atomic-warnings.patch
lockdep-name-some-old-style-locks.patch
sleep-profiling.patch
sleep-profiling-fixes.patch
sleep-profiling-fix.patch
debug-workqueue-locking-sanity.patch
debug-workqueue-locking-sanity-fix.patch
remove-the-old-bd_mutex-lockdep-annotation.patch
new-bd_mutex-lockdep-annotation.patch
remove-lock_key-approach-to-managing-nested-bd_mutex-locks.patch
simplify-some-aspects-of-bd_mutex-nesting.patch
use-mutex_lock_nested-for-bd_mutex-to-avoid-lockdep-warning.patch
avoid-lockdep-warning-in-md.patch
fix-generic-warn_on-message.patch
schedc-correct-comment-for-this_rq_lock-routine.patch
sched-fix-migration-cost-estimator.patch
kernel-schedc-whitespace-cleanups.patch
kernel-schedc-whitespace-cleanups-more.patch
sched-add-above-background-load-function.patch
mm-implement-swap-prefetching.patch
sched-cleanup-remove-task_t-convert-to-struct-task_struct-prefetch.patch
gtod-exponential-update_wall_time.patch
gtod-persistent-clock-support-core.patch
gtod-persistent-clock-support-i386.patch
time-uninline-jiffiesh.patch
time-uninline-jiffiesh-fix.patch
time-fix-msecs_to_jiffies-bug.patch
time-fix-timeout-overflow.patch
cleanup-uninline-irq_enter-and-move-it-into-a-function.patch
dynticks-extend-next_timer_interrupt-to-use-a-reference-jiffie.patch
dynticks-extend-next_timer_interrupt-to-use-a-reference-jiffie-remove-incorrect-warning-in-kernel-timerc.patch
hrtimers-namespace-and-enum-cleanup.patch
hrtimers-clean-up-locking.patch
updated-hrtimers-state-tracking.patch
updated-hrtimers-clean-up-callback-tracking.patch
updated-hrtimers-move-and-add-documentation.patch
updated-add-a-framework-to-manage-clock-event-devices.patch
updated-acpi-include-apich.patch
updated-acpi-keep-track-of-timer-broadcast.patch
updated-acpi-add-state-propagation-for-dynamic-broadcasting.patch
updated-i386-cleanup-apic-code.patch
updated-i386-convert-to-clock-event-devices.patch
updated-pm_timer-allow-early-access-and-move-externs-to-a-header-file.patch
updated-i386-rework-local-apic-calibration.patch
updated-high-res-timers-core.patch
updated-gtod-mark-tsc-unusable-for-highres-timers.patch
updated-dynticks-core-code.patch
updated-dyntick-add-nohz-stats-to-proc-stat.patch
updated-dynticks-i386-arch-code.patch
updated-dynticks-fix-nmi-watchdog.patch
updated-high-res-timers-dynticks-enable-i386-support.patch
updated-debugging-feature-timer-stats.patch
clockevents-core-check-for-clock-event-device-handler-being-non-null-before-calling-it.patch
round_jiffies-infrastructure.patch
round_jiffies-infrastructure-fix.patch
clocksource-add-usage-of-config_sysfs.patch
clocksource-small-cleanup-2.patch
clocksource-small-cleanup-2-fix.patch
clocksource-small-acpi_pm-cleanup.patch
detect-atomic-counter-underflows.patch
debug-shared-irqs.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
vdso-print-fatal-signals.patch
vdso-improve-print_fatal_signals-support-by-adding-memory-maps.patch
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