From: Corey Minyard <minyard@acm.org>
To: Linux Kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>
Cc: OpenIPMI Developers <openipmi-developer@lists.sourceforge.net>,
Matthew Garrett <mjg@redhat.com>
Subject: [PATCH 6/8] ipmi: Reduce polling
Date: Mon, 03 May 2010 08:36:59 -0500 [thread overview]
Message-ID: <20100503133659.GF8130@minyard.local> (raw)
From: Matthew Garrett <mjg@redhat.com>
We can reasonably alter the poll rate depending on whether we're performing a
transaction or merely waiting for an event.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
Index: linux-2.6/drivers/char/ipmi/ipmi_si_intf.c
===================================================================
--- linux-2.6.orig/drivers/char/ipmi/ipmi_si_intf.c
+++ linux-2.6/drivers/char/ipmi/ipmi_si_intf.c
@@ -893,6 +893,9 @@ static void sender(void *
mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
+ if (smi_info->thread)
+ wake_up_process(smi_info->thread);
+
if (smi_info->run_to_completion) {
/*
* If we are running to completion, then throw it in
@@ -1013,6 +1016,8 @@ static int ipmi_thread(void *data)
; /* do nothing */
else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
schedule();
+ else if (smi_result == SI_SM_IDLE)
+ schedule_timeout_interruptible(100);
else
schedule_timeout_interruptible(0);
}
@@ -1055,6 +1060,7 @@ static void smi_timeout(unsigned long da
unsigned long flags;
unsigned long jiffies_now;
long time_diff;
+ long timeout;
#ifdef DEBUG_TIMING
struct timeval t;
#endif
@@ -1075,9 +1081,9 @@ static void smi_timeout(unsigned long da
if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
/* Running with interrupts, only do long timeouts. */
- smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
+ timeout = jiffies + SI_TIMEOUT_JIFFIES;
smi_inc_stat(smi_info, long_timeouts);
- goto do_add_timer;
+ goto do_mod_timer;
}
/*
@@ -1086,15 +1092,15 @@ static void smi_timeout(unsigned long da
*/
if (smi_result == SI_SM_CALL_WITH_DELAY) {
smi_inc_stat(smi_info, short_timeouts);
- smi_info->si_timer.expires = jiffies + 1;
+ timeout = jiffies + 1;
} else {
smi_inc_stat(smi_info, long_timeouts);
- smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
+ timeout = jiffies + SI_TIMEOUT_JIFFIES;
}
- do_add_timer:
- if ((smi_result != SI_SM_IDLE) || smi_info->interrupt_disabled)
- add_timer(&(smi_info->si_timer));
+ do_mod_timer:
+ if (smi_result != SI_SM_IDLE)
+ mod_timer(&(smi_info->si_timer), timeout);
}
static irqreturn_t si_irq_handler(int irq, void *data)
reply other threads:[~2010-05-03 13:37 UTC|newest]
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