Messages in this thread Patch in this message | | | Date | Wed, 30 Dec 2009 11:17:51 +0800 | From | Xiao Guangrong <> | Subject | [PATCH 2/3] perf_event: support getting relocation offset |
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Support getting relocation offset by using 'inject' event
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> --- arch/x86/kernel/cpu/perf_event.c | 6 ++++++ include/linux/perf_event.h | 1 + kernel/perf_event.c | 23 +++++++++++++++++++++-- 3 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 11d2a7d..fbb39f6 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -2470,3 +2470,9 @@ void hw_perf_event_setup_online(int cpu) { init_debug_store_on_cpu(cpu); } + +int perf_inject_get_relocate_offset(u64 *offset) +{ + *offset = relocate_offset; + return 0; +} diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 6c93f88..2671234 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -428,6 +428,7 @@ enum perf_event_type { enum perf_inject_event { PERF_INJECT_HZ = 0x01, + PERF_INJECT_RELOCATE_OFFSET = 0x02, }; enum perf_callchain_context { diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 9343c6c..9331426 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -2012,6 +2012,12 @@ unlock: return ret; } +extern __weak int perf_inject_get_relocate_offset(u64 *offset) +{ + *offset = 0; + return 0; +} + static int perf_inject_get_hz(u64 *hz) { *hz = HZ; @@ -2050,10 +2056,23 @@ exit: static int perf_inject_ioctl(struct perf_event *event, unsigned int arg) { - if (!arg || arg & ~PERF_INJECT_HZ) + int ret = 0; + + if (!arg || arg & ~(PERF_INJECT_HZ | PERF_INJECT_RELOCATE_OFFSET)) return -EINVAL; - return perf_inject_event(event, PERF_INJECT_HZ, perf_inject_get_hz); + if (arg & PERF_INJECT_HZ) { + ret = perf_inject_event(event, PERF_INJECT_HZ, + perf_inject_get_hz); + if (ret) + goto exit; + } + + if (arg & PERF_INJECT_RELOCATE_OFFSET) + ret = perf_inject_event(event, PERF_INJECT_RELOCATE_OFFSET, + perf_inject_get_relocate_offset); +exit: + return ret; } static int perf_event_set_output(struct perf_event *event, int output_fd); -- 1.6.1.2
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