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3cbed429a9
Impact: extend perf_counter infrastructure This adds an optional hw_perf_group_sched_in() arch function that enables a whole group of counters in one go. It returns 1 if it added the group successfully, 0 if it did nothing (and therefore the core needs to add the counters individually), or a negative number if an error occurred. It should add all the counters and enable any software counters in the group, or else add none of them and return an error. There are a couple of related changes/improvements in the group handling here: * As an optimization, group_sched_out() and group_sched_in() now check the state of the group leader, and do nothing if the leader is not active or disabled. * We now call hw_perf_save_disable/hw_perf_restore around the complete set of counter enable/disable calls in __perf_counter_sched_in/out, to give the arch code the opportunity to defer updating the hardware state until the hw_perf_restore call if it wants. * We no longer stop adding groups after we get to a group that has more than one counter. We will ultimately add an option for a group to be exclusive. The current code doesn't really implement exclusive groups anyway, since a group could end up going on with other counters that get added before it. Signed-off-by: Paul Mackerras <paulus@samba.org> |
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| acpi | ||
| asm-arm | ||
| asm-frv | ||
| asm-generic | ||
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| asm-m32r | ||
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| asm-mn10300 | ||
| asm-xtensa | ||
| crypto | ||
| drm | ||
| keys | ||
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| math-emu | ||
| media | ||
| mtd | ||
| net | ||
| pcmcia | ||
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| rxrpc | ||
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