Messages in this thread | | | From | Borislav Petkov <> | Subject | [RFC PATCH 0/3] Perf persistent events | Date | Fri, 15 Mar 2013 14:06:26 +0100 |
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From: Borislav Petkov <bp@suse.de>
Yeah,
here's a refresh of the persistent events deal, accessing those is much cleaner now. Here's how:
So kernel code initializes and enables the event at its convenience (during boot, whenever) and userspace goes and says:
sys_perf_event_open(pattr,...)
with pattr.persistent = 1. Userspace gets the persistent buffer file descriptor to read from. Without that, we get a normal perf file descriptor for the duration of the tracing.
This saves all the diddling of trying to hand down file descriptors through debugfs or whatever. Instead, current perf code simply can use it.
This is still RFC but things are starting to fall into place slowly. As always, any and all comments/suggestions are welcome.
Borislav Petkov (3): perf: Add persistent events perf: Add persistent event facilities MCE: Enable persistent event
arch/x86/kernel/cpu/mcheck/mce.c | 25 +++++++ include/linux/perf_event.h | 14 +++- include/uapi/linux/perf_event.h | 3 +- kernel/events/Makefile | 2 +- kernel/events/core.c | 27 +++++--- kernel/events/internal.h | 4 ++ kernel/events/persistent.c | 141 +++++++++++++++++++++++++++++++++++++++ 7 files changed, 202 insertions(+), 14 deletions(-) create mode 100644 kernel/events/persistent.c
-- 1.8.1.3.535.ga923c31
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