cca57c5b5a
DEBUG_MUTEX flag is on by default in current kernel configuration. During performance testing, we saw mutex debug functions like mutex_debug_check_no_locks_freed (called by kfree()) is expensive as it goes through a global list of memory areas with mutex lock and do the checking. For benchmarks such as Volanomark and Hackbench, we have seen more than 40% drop in performance on some platforms. We suggest to set DEBUG_MUTEX off by default. Or at least do that later when we feel that the mutex changes in the current code have stabilized. Signed-off-by: Tim Chen <tim.c.chen@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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.. | ||
reed_solomon | ||
zlib_deflate | ||
zlib_inflate | ||
.gitignore | ||
bitmap.c | ||
bust_spinlocks.c | ||
cmdline.c | ||
cpumask.c | ||
crc-ccitt.c | ||
crc16.c | ||
crc32.c | ||
crc32defs.h | ||
ctype.c | ||
dec_and_lock.c | ||
div64.c | ||
dump_stack.c | ||
errno.c | ||
extable.c | ||
find_next_bit.c | ||
gen_crc32table.c | ||
genalloc.c | ||
halfmd4.c | ||
hweight.c | ||
idr.c | ||
inflate.c | ||
int_sqrt.c | ||
iomap.c | ||
iomap_copy.c | ||
Kconfig | ||
Kconfig.debug | ||
kernel_lock.c | ||
klist.c | ||
kobject.c | ||
kobject_uevent.c | ||
kref.c | ||
libcrc32c.c | ||
Makefile | ||
parser.c | ||
prio_tree.c | ||
radix-tree.c | ||
rbtree.c | ||
rwsem-spinlock.c | ||
rwsem.c | ||
semaphore-sleepers.c | ||
sha1.c | ||
smp_processor_id.c | ||
sort.c | ||
spinlock_debug.c | ||
string.c | ||
swiotlb.c | ||
textsearch.c | ||
ts_bm.c | ||
ts_fsm.c | ||
ts_kmp.c | ||
vsprintf.c |