From: Will Schmidt <will_schmidt@vnet.ibm.com>
Date: Tue, 17 Apr 2007 14:44:46 +0000 (+1000)
Subject: [POWERPC] hvc_console: Polling mode timer backoff
X-Git-Tag: v2.6.22-rc1~1109^2~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b791072ba3c3b29bab1890963bde52eb944a8451;p=pandora-kernel.git

[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>
---

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