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authorArjan van de Ven <arjan@linux.intel.com>2006-10-01 02:27:17 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 03:39:19 -0400
commit5c87579e65ee4f419b2369407f82326d38b5d2d8 (patch)
tree3e015ba93eb6eefb7ed4318daf95be0771d596a8 /include/linux/latency.h
parent130c6b98984a058068ea595c465fba2beb48b9ef (diff)
[PATCH] maximum latency tracking infrastructure
Add infrastructure to track "maximum allowable latency" for power saving policies. The reason for adding this infrastructure is that power management in the idle loop needs to make a tradeoff between latency and power savings (deeper power save modes have a longer latency to running code again). The code that today makes this tradeoff just does a rather simple algorithm; however this is not good enough: There are devices and use cases where a lower latency is required than that the higher power saving states provide. An example would be audio playback, but another example is the ipw2100 wireless driver that right now has a very direct and ugly acpi hook to disable some higher power states randomly when it gets certain types of error. The proposed solution is to have an interface where drivers can * announce the maximum latency (in microseconds) that they can deal with * modify this latency * give up their constraint and a function where the code that decides on power saving strategy can query the current global desired maximum. This patch has a user of each side: on the consumer side, ACPI is patched to use this, on the producer side the ipw2100 driver is patched. A generic maximum latency is also registered of 2 timer ticks (more and you lose accurate time tracking after all). While the existing users of the patch are x86 specific, the infrastructure is not. I'd like to ask the arch maintainers of other architectures if the infrastructure is generic enough for their use (assuming the architecture has such a tradeoff as concept at all), and the sound/multimedia driver owners to look at the driver facing API to see if this is something they can use. [akpm@osdl.org: cleanups] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Jesse Barnes <jesse.barnes@intel.com> Cc: "Brown, Len" <len.brown@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/latency.h')
-rw-r--r--include/linux/latency.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/latency.h b/include/linux/latency.h
new file mode 100644
index 000000000000..c08b52bb55b0
--- /dev/null
+++ b/include/linux/latency.h
@@ -0,0 +1,25 @@
1/*
2 * latency.h: Explicit system-wide latency-expectation infrastructure
3 *
4 * (C) Copyright 2006 Intel Corporation
5 * Author: Arjan van de Ven <arjan@linux.intel.com>
6 *
7 */
8
9#ifndef _INCLUDE_GUARD_LATENCY_H_
10#define _INCLUDE_GUARD_LATENCY_H_
11
12#include <linux/notifier.h>
13
14void set_acceptable_latency(char *identifier, int usecs);
15void modify_acceptable_latency(char *identifier, int usecs);
16void remove_acceptable_latency(char *identifier);
17void synchronize_acceptable_latency(void);
18int system_latency_constraint(void);
19
20int register_latency_notifier(struct notifier_block * nb);
21int unregister_latency_notifier(struct notifier_block * nb);
22
23#define INFINITE_LATENCY 1000000
24
25#endif