diff options
| author | Will Schmidt <will_schmidt@vnet.ibm.com> | 2007-04-17 10:44:46 -0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-04-24 07:31:43 -0400 |
| commit | b791072ba3c3b29bab1890963bde52eb944a8451 (patch) | |
| tree | f0a506318d8ea653057d6f99387c163b526ebeb3 /drivers/char/vc_screen.c | |
| parent | b3a6d2a54b8be331b36d849577a716867895ca75 (diff) | |
[POWERPC] hvc_console: Polling mode timer backoff
Add a back-off mechanism to hvc_console's polling logic. This change
drops the timers/second ratio from ~90 to ~1/2 while the console is
idle.
This change is most noticeable when watching /proc/timer_stats output.
This only affects when the hvc_console is running in poll mode, i.e.
power4 and cell systems.
I've tested on Power4, Michael Ellerman has both contributed to the
patch and tested on cell.
Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/char/vc_screen.c')
0 files changed, 0 insertions, 0 deletions