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[POWERPC] pseries: Avoid excess rtas_token calls 

We don't need to look up the rtas event token once per
cpu per second.  This avoids some misc device-tree lookups
and string ops and so provides some minor performance
improvement.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>

----
Revised commit-log message.

 arch/powerpc/platforms/pseries/rtasd.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Linas Vepstas 2007-08-10 07:01:50 +10:00 committed by Paul Mackerras
parent f774216d46
commit a4fc3a3cea
1 changed files with 9 additions and 6 deletions
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15
arch/powerpc/platforms/pseries/rtasd.c
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@ -44,10 +44,13 @@ static unsigned long rtas_log_start;
static unsigned long rtas_log_size;
static int surveillance_timeout = -1;
static unsigned int rtas_event_scan_rate;
static unsigned int rtas_error_log_max;
static unsigned int rtas_error_log_buffer_max;
/* RTAS service tokens */
static unsigned int event_scan;
static unsigned int rtas_event_scan_rate;
static int full_rtas_msgs = 0;
extern int no_logging;
@ -381,7 +384,7 @@ static int get_eventscan_parms(void)
return 0;
}
static void do_event_scan(int event_scan)
static void do_event_scan(void)
{
int error;
do {
@ -408,7 +411,7 @@ static void do_event_scan_all_cpus(long delay)
cpu = first_cpu(cpu_online_map);
for (;;) {
set_cpus_allowed(current, cpumask_of_cpu(cpu));
do_event_scan(rtas_token("event-scan"));
do_event_scan();
set_cpus_allowed(current, CPU_MASK_ALL);
/* Drop hotplug lock, and sleep for the specified delay */
@ -426,12 +429,11 @@ static void do_event_scan_all_cpus(long delay)
static int rtasd(void *unused)
{
unsigned int err_type;
int event_scan = rtas_token("event-scan");
int rc;
daemonize("rtasd");
if (event_scan == RTAS_UNKNOWN_SERVICE || get_eventscan_parms() == -1)
if (get_eventscan_parms() == -1)
goto error;
rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER);
@ -486,7 +488,8 @@ static int __init rtas_init(void)
return 0;
/* No RTAS */
if (rtas_token("event-scan") == RTAS_UNKNOWN_SERVICE) {
event_scan = rtas_token("event-scan");
if (event_scan == RTAS_UNKNOWN_SERVICE) {
printk(KERN_DEBUG "rtasd: no event-scan on system\n");
return -ENODEV;
}