Messages in this thread | | | Subject | Re: [PATCH V6 13/15] perf intel-pt: Add support for text poke events | From | Adrian Hunter <> | Date | Tue, 21 Apr 2020 16:10:33 +0300 |
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On 21/04/20 4:06 pm, Jiri Olsa wrote: > On Tue, Apr 21, 2020 at 04:02:32PM +0300, Adrian Hunter wrote: >> On 21/04/20 3:50 pm, Jiri Olsa wrote: >>> On Sun, Apr 05, 2020 at 11:13:25PM +0300, Adrian Hunter wrote: >>>> Select text poke events when available and the kernel is being traced. >>>> Process text poke events to invalidate entries in Intel PT's instruction >>>> cache. >>>> >>>> Example: >>>> >>>> The example requires kernel config: >>>> CONFIG_PROC_SYSCTL=y >>>> CONFIG_SCHED_DEBUG=y >>>> CONFIG_SCHEDSTATS=y >>>> >>>> Before: >>>> >>>> # perf record -o perf.data.before --kcore -a -e intel_pt//k -m,64M & >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 0 >>>> # echo 1 > /proc/sys/kernel/sched_schedstats >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 1 >>>> # echo 0 > /proc/sys/kernel/sched_schedstats >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 0 >>>> # kill %1 >>>> [ perf record: Woken up 1 times to write data ] >>>> [ perf record: Captured and wrote 3.341 MB perf.data.before ] >>>> [1]+ Terminated perf record -o perf.data.before --kcore -a -e intel_pt//k -m,64M >>>> # perf script -i perf.data.before --itrace=e >/dev/null >>>> Warning: >>>> 474 instruction trace errors >>>> >>>> After: >>>> >>>> # perf record -o perf.data.after --kcore -a -e intel_pt//k -m,64M & >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 0 >>>> # echo 1 > /proc/sys/kernel/sched_schedstats >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 1 >>>> # echo 0 > /proc/sys/kernel/sched_schedstats >>>> # cat /proc/sys/kernel/sched_schedstats >>>> 0 >>>> # kill %1 >>>> [ perf record: Woken up 1 times to write data ] >>>> [ perf record: Captured and wrote 2.646 MB perf.data.after ] >>>> [1]+ Terminated perf record -o perf.data.after --kcore -a -e intel_pt//k -m,64M >>>> # perf script -i perf.data.after --itrace=e >/dev/null >>> >>> >>> I'm still seeing some, probably I'm missing some CONFIG, will check >>> >>> # ./perf record -o perf.data.after --kcore -a -e intel_pt//k -m,64M & >>> [1] 5880 >>> # cat /proc/sys/kernel/sched_schedstats >>> 0 >>> # echo 1 > /proc/sys/kernel/sched_schedstats >>> # cat /proc/sys/kernel/sched_schedstats >>> 1 >>> # echo 0 > /proc/sys/kernel/sched_schedstats >>> # kill %1 >>> # [ perf record: Woken up 1 times to write data ] >>> [ perf record: Captured and wrote 6.181 MB perf.data.after ] >>> [1]+ Terminated ./perf record -o perf.data.after --kcore -a -e intel_pt//k -m,64M >>> # ./perf script --itrace=e -i perf.data.after > /dev/null >>> Warning: >>> 18837 instruction trace errors >>> >>> # ./perf script --itrace=e -i perf.data.after | head >>> instruction trace error type 1 time 9274.420582345 cpu 9 pid 845 tid 845 ip 0xffffffff814e6cf2 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422229726 cpu 39 pid 5880 tid 5880 ip 0xffffffffa030a320 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422231972 cpu 39 pid 5880 tid 5880 ip 0xffffffffa0315c1c code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422236141 cpu 39 pid 5880 tid 5880 ip 0xffffffff81143263 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422237424 cpu 39 pid 5880 tid 5880 ip 0xffffffff8115c388 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422239028 cpu 39 pid 5880 tid 5880 ip 0xffffffff811428c9 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422239028 cpu 39 pid 5880 tid 5880 ip 0xffffffffa13279fb code 5: Failed to get instruction >>> instruction trace error type 1 time 9274.422242556 cpu 39 pid 5880 tid 5880 ip 0xffffffff814e9c73 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422258915 cpu 39 pid 5880 tid 5880 ip 0xffffffff810d7da2 code 6: Trace doesn't match instruction >>> instruction trace error type 1 time 9274.422258915 cpu 39 pid 5880 tid 5880 ip 0xffffffffa030a0b2 code 6: Trace doesn't match instruction >> >> I don't think it can be CONFIG. Can you share the branch you are using? >> Then I can test it. >> > > I built the one you mentioned in cover email: > git://git.infradead.org/users/ahunter/linux-perf.git text_poke
The tools and the kernel?
Does it successfully decode anything? e.g. ./perf script --itrace=be -i perf.data.after | head
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