diff options
| author | Ken Chen <kenchen@google.com> | 2008-12-15 22:02:01 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-16 12:15:00 +0100 |
| commit | 720f54988e17b33f3f477010b3a68ee872d20d5a (patch) | |
| tree | ebb475d1a7af97926c1f469a57bef47c46e9ae98 /kernel/delayacct.c | |
| parent | 34f28ecd0f4bdc733c681294d02d9fab5880591b (diff) | |
sched, cpuacct: refactoring cpuusage_read / cpuusage_write
Impact: micro-optimize the code on 64-bit architectures
In the thread regarding to 'export percpu cpuacct cgroup stats'
http://lkml.org/lkml/2008/12/7/13
akpm pointed out that current cpuacct code is inefficient. This patch
refactoring the following:
* make cpu_rq locking only on 32-bit
* change iterator to each_present_cpu instead of each_possible_cpu to
make it hotplug friendly.
It's a bit of code churn, but I was rewarded with 160 byte code size saving
on x86-64 arch and zero code size change on i386.
Signed-off-by: Ken Chen <kenchen@google.com>
Cc: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/delayacct.c')
0 files changed, 0 insertions, 0 deletions