| commit | df211c8a478e16232ebbc16e650b19163183fcb6 | |
| author | Nathan Lynch <ntl@pobox.com> | |
| Wed, 23 May 2007 00:51:25 +0000 (23 10:51 +1000) | ||
| committer | Paul Mackerras <paulus@samba.org> | |
| Mon, 25 Jun 2007 06:58:11 +0000 (25 16:58 +1000) | ||
| tree | 90972e63f445e0edad7a195a025ad3fffa9283f3 | treesnapshot (tar.gz zip) |
| parent | 1a06e0fe96526e43bab90fbab2263b55fb3d45d1 | commitdiff |
[POWERPC] Remove spinlock from struct cpu_purr_data
cpu_purr_data is a per-cpu array used to account for stolen time on
partitioned systems. It used to be the case that cpus accessed each
others' cpu_purr_data, so each entry was protected by a spinlock.
However, the code was reworked ("Simplify stolen time calculation")
with the result that each cpu accesses its own cpu_purr_data and not
those of other cpus. This means we can get rid of the spinlock as
long as we're careful to disable interrupts when accessing
cpu_purr_data in process context.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
cpu_purr_data is a per-cpu array used to account for stolen time on
partitioned systems. It used to be the case that cpus accessed each
others' cpu_purr_data, so each entry was protected by a spinlock.
However, the code was reworked ("Simplify stolen time calculation")
with the result that each cpu accesses its own cpu_purr_data and not
those of other cpus. This means we can get rid of the spinlock as
long as we're careful to disable interrupts when accessing
cpu_purr_data in process context.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| arch/powerpc/kernel/time.c | diffblobblamehistory |