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| author | Christoph Lameter <christoph@lameter.com> | 2005-07-07 17:56:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-07 18:23:46 -0700 |
| commit | 6c036527a630720063b67d9a65455e8caca2c8fa (patch) | |
| tree | 316e947f5f4efcda0205e48044ed1d12665eaed1 /kernel/profile.c | |
| parent | 0db925af1db5f3dfe1691c35b39496e2baaff9c9 (diff) | |
| download | lwn-6c036527a630720063b67d9a65455e8caca2c8fa.tar.gz lwn-6c036527a630720063b67d9a65455e8caca2c8fa.zip | |
[PATCH] mostly_read data section
Add a new section called ".data.read_mostly" for data items that are read
frequently and rarely written to like cpumaps etc.
If these maps are placed in the .data section then these frequenly read
items may end up in cachelines with data is is frequently updated. In that
case all processors in an SMP system must needlessly reload the cachelines
again and again containing elements of those frequently used variables.
The ability to share these cachelines will allow each cpu in an SMP system
to keep local copies of those shared cachelines thereby optimizing
performance.
Signed-off-by: Alok N Kataria <alokk@calsoftinc.com>
Signed-off-by: Shobhit Dayal <shobhit@calsoftinc.com>
Signed-off-by: Christoph Lameter <christoph@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/profile.c')
| -rw-r--r-- | kernel/profile.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/profile.c b/kernel/profile.c index ad8cbb75ffa2..f89248e6d704 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -35,11 +35,11 @@ struct profile_hit { #define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ) /* Oprofile timer tick hook */ -int (*timer_hook)(struct pt_regs *); +int (*timer_hook)(struct pt_regs *) __read_mostly; static atomic_t *prof_buffer; static unsigned long prof_len, prof_shift; -static int prof_on; +static int prof_on __read_mostly; static cpumask_t prof_cpu_mask = CPU_MASK_ALL; #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits); |