The patch titled
lib: dampen the percpu_counter FBC_BATCH
has been removed from the -mm tree. Its filename was
lib-dampen-the-percpu_counter-fbc_batch.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: lib: dampen the percpu_counter FBC_BATCH
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
With the current logic the percpu_counter's accuracy delta is quadric wrt the
number of cpus in the system, reduce this to O(n ln n).
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/percpu_counter.h | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff -puN include/linux/percpu_counter.h~lib-dampen-the-percpu_counter-fbc_batch include/linux/percpu_counter.h
--- a/include/linux/percpu_counter.h~lib-dampen-the-percpu_counter-fbc_batch
+++ a/include/linux/percpu_counter.h
@@ -11,6 +11,7 @@
#include <linux/threads.h>
#include <linux/percpu.h>
#include <linux/types.h>
+#include <linux/log2.h>
#ifdef CONFIG_SMP
@@ -20,11 +21,7 @@ struct percpu_counter {
s32 *counters;
};
-#if NR_CPUS >= 16
-#define FBC_BATCH (NR_CPUS*2)
-#else
-#define FBC_BATCH (NR_CPUS*4)
-#endif
+#define FBC_BATCH (8*ilog2(NR_CPUS))
static inline void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{
_
Patches currently in -mm which might be from a.p.zijlstra@xxxxxxxxx are
lumpy-reclaim-v4.patch
split-mmap.patch
only-allow-nonlinear-vmas-for-ram-backed-filesystems.patch
mm-remove-destroy_dirty_buffers-from-invalidate_bdev.patch
mm-optimize-kill_bdev.patch
mm-optimize-kill_bdev-fix.patch
mm-optimize-acorn-partition-truncate.patch
lazy-freeing-of-memory-through-madv_free.patch
lazy-freeing-of-memory-through-madv_free-fix.patch
lazy-freeing-of-memory-through-madv_free-vs-mm-madvise-avoid-exclusive-mmap_sem.patch
restore-madv_dontneed-to-its-original-linux-behaviour.patch
exec-fix-remove_arg_zero-add-comment.patch
lockdep-treats-down_write_trylock-like-regular-down_write.patch
nfs-fix-congestion-control-use-atomic_longs.patch
lib-dampen-the-percpu_counter-fbc_batch.patch
lib-percpu_counter_mod64.patch
mm-bdi-init-hooks.patch
mm-bdi-init-hooks-fix.patch
mm-scalable-bdi-statistics-counters.patch
mm-count-reclaimable-pages-per-bdi.patch
mm-count-writeback-pages-per-bdi.patch
mm-expose-bdi-statistics-in-sysfs.patch
mm-expose-bdi-statistics-in-sysfs-printk-fixes.patch
mm-per-device-dirty-threshold.patch
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