| Commit message (Collapse) | Author | Age | Files | Lines |
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It has never been used for anything, and Linux 3.7 doesn't propagate
this information anymore.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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... and code used only for initializing it.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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If CPU stays in the same idle state for the full duration of
xenpm sample then average residency may not be reported correctly
since usage counter will not be incremented.
In addition, in order to calculate averages correctly residence
time and usage counter should be read and written atomically.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
Committed-by: Keir Fraser <keir@xen.org>
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.. to reduce the amount of holes (wasted space).
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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Calling XENPF_set_processor_pminfo with XEN_PM_CX could cause states
array in "struct acpi_processor_power" to exceed its limit.
The array used to be reset (by function cpuidle_init_cpu()) for each
hypercall. The patch puts it back that way and adds an assertion to
make it clear in case that happens again.
Signed-off-by: Eric Chanudet <eric.chanudet@eu.citrix.com>
- convert assertion to printk() & bail
- eliminate struct acpi_processor_cx's valid member (not read anymore)
- further adjustments to one-time-only vs each-time operations in
cpuidle_init_cpu()
- don't use ACPI_STATE_Cn as array index anymore
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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Move all extern declarations into appropriate header files.
This also fixes up a few places where the caller and the definition
had different signatures.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
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This means suppressing the uses in time_calibration_tsc_rendezvous(),
cstate_restore_tsc(), and synchronize_tsc_slave(), and fixes a boot
hang of Linux Dom0 when loading processor.ko on such systems that
have support for C states above C1.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Keir Fraser <keir@xen.org>
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Move them out of a header file and make the macros proper functions again.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
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Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
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For cpu which enter deep C state via monitor/mwait, wakeup can be done
by writing to the monitored memory. So once monitor softirq_pending,
we can remove the redundant ipis.
Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Wei Gang <gang.wei@intel.com>
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this is a revised version of linux upstream commit
69d25870f20c4b2563304f2b79c5300dd60a067e:
"
cpuidle: fix the menu governor to boost IO performance
Fix the menu idle governor which balances power savings, energy
efficiency
and performance impact.
The reason for a reworked governor is that there have been
serious
performance issues reported with the existing code on Nehalem
server
systems.
To show this I'm sure Andrew wants to see benchmark results:
(benchmark is "fio", "no cstates" is using "idle=3Dpoll")
no cstates current linux new algorithm
1 disk 107 Mb/s 85 Mb/s 105 Mb/s
2 disks 215 Mb/s 123 Mb/s 209 Mb/s
12 disks 590 Mb/s 320 Mb/s 585 Mb/s
In various power benchmark measurements, no degredation was found
by our
measurement&diagnostics team. Obviously a small percentage more
power was
used in the "fio" benchmark, due to the much higher performance.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
"
in Xen version, most logic is similar and with only one exception:
linux use nr_iowait and loadavg to track the pending I/O request,
which however is not visible to Xen. so Xen use the do_irq frequency
to estimate the I/O pressure. this is not as accurate as linux, and
the better approach is to convey guest latency requirement to
hypervisor by virtual C state. this can be the future enhancement.
the detail algorithm description is in code comment. with this new
algorithm, fio benchmark performance improve ~5% with 1 disk. and no
power degration is found in idle case.
Signed-off-by: Yu Ke <ke.yu@intel.com>
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- remove redundant declarations
- add/move prototypes to headers
- move things where they belong to
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
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Add support for C1 FFH (mwait) entry. Meanwhile add timing for C1. The
timing for C1 should be accurate for FFH case, but may not for halt case.
Signed-off-by: Wei Gang <gang.wei@intel.com>
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This patch adds an idx field in the 'struct acpi_processor_cx'. It can
simplify some coding lines.
Signed-off-by: Guanqun Lu <guanqun.lu@intel.com>
Signed-off-by: Wei Gang <gang.wei@intel.com>=
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The ladder governor has long pro/demotion delay shortcome while
applying to tickless mode, because it needs to count usage. Menu
governor chooses the next state simply via break-event prediction
including the factors of next timer event & last residency time etc,
so it would have faster response speed.
Signed-off-by: Gang Wei <gang.wei@intel.com>
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