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 16:02:32 +0300 |
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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.
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