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Groups > linux.kernel > #1320379
| From | Gautham R Shenoy <ego@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v7 3/6] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path |
| Date | 2016-01-28 09:20 +0100 |
| Message-ID | <qVPY7-AA-11@gated-at.bofh.it> (permalink) |
| References | <qVPbH-8rA-1@gated-at.bofh.it> <qVPbH-8rA-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Jan 28, 2016 at 12:55:38PM +0530, Shilpasri G Bhat wrote: > cpu_to_chip_id() does a DT walk through to find out the chip id by > taking a contended device tree lock. This adds an unnecessary overhead > in a hot path. So instead of calling cpu_to_chip_id() everytime cache > the chip ids for all cores in the array 'core_to_chip_map' and use it > in the hotpath. > > Reported-by: Anton Blanchard <anton@samba.org> > Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> -- Thanks and Regards gautham.
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[PATCH v7 0/6] cpufreq: powernv: Redesign the presentation of throttle notification and solve bug-fixes in the driver Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
[PATCH v7 2/6] cpufreq: powernv: Hot-plug safe the kworker thread Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
[PATCH v7 3/6] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
Re: [PATCH v7 3/6] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path Gautham R Shenoy <ego@linux.vnet.ibm.com> - 2016-01-28 09:20 +0100
Re: [PATCH v7 3/6] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 09:30 +0100
[PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Gautham R Shenoy <ego@linux.vnet.ibm.com> - 2016-01-28 09:40 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 09:50 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 10:40 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 10:50 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 11:00 +0100
Re: [PATCH v7 6/6] cpufreq: powernv: Add sysfs attributes to show throttle stats Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 12:50 +0100
[PATCH v7 5/6] cpufreq: powernv: Replace pr_info with trace print for throttle event Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
Re: [PATCH v7 5/6] cpufreq: powernv: Replace pr_info with trace print for throttle event Gautham R Shenoy <ego@linux.vnet.ibm.com> - 2016-01-28 09:20 +0100
Re: [PATCH v7 5/6] cpufreq: powernv: Replace pr_info with trace print for throttle event Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 09:30 +0100
[PATCH v7 1/6] cpufreq: powernv: Free 'chips' on module exit Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
Re: [PATCH v7 1/6] cpufreq: powernv: Free 'chips' on module exit Gautham R Shenoy <ego@linux.vnet.ibm.com> - 2016-01-28 09:10 +0100
Re: [PATCH v7 1/6] cpufreq: powernv: Free 'chips' on module exit Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 09:30 +0100
[PATCH v7 4/6] cpufreq: powernv/tracing: Add powernv_throttle tracepoint Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2016-01-28 08:30 +0100
Re: [PATCH v7 0/6] cpufreq: powernv: Redesign the presentation of throttle notification and solve bug-fixes in the driver Viresh Kumar <viresh.kumar@linaro.org> - 2016-01-28 09:30 +0100
Re: [PATCH v7 0/6] cpufreq: powernv: Redesign the presentation of throttle notification and solve bug-fixes in the driver Balbir Singh <bsingharora@gmail.com> - 2016-01-28 12:20 +0100
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