On 03/26/11 06:31, zhao bao wrote: >> It's used to trace kernel space page faults, not for userspace code. >> >> Lin Ming >> > > From the ouput of "perf report" command, I think perf can record the > page faults from userspace code. > > [root@localhost lab]# perf record -R -c 1 -d -e faults ./hello > hello,world
'-e faults' is a software event. perf-trace does not handle S/W events. perf-trace has been renamed to perf-script, and perf-script recently gained the ability to dump S/W events: https://lkml.org/lkml/2011/3/10/3 David > [ perf record: Woken up 1 times to write data ] > [ perf record: Captured and wrote 0.010 MB perf.data (~420 samples) ] > [root@localhost lab]# perf report > # Events: 92 cycles > # > # Overhead Command Shared Object Symbol > # ........ ....... ................. ...... > # > 10.87% hello ld-2.12.90.so [.] .L198 > 6.52% hello ld-2.12.90.so [.] _dl_load_cache_lookup > 6.52% hello ld-2.12.90.so [.] _dl_lookup_symbol_x > 4.35% hello ld-2.12.90.so [.] dl_main > 3.26% hello ld-2.12.90.so [.] _dl_start > 3.26% hello ld-2.12.90.so [.] _dl_cache_libcmp > 3.26% hello ld-2.12.90.so [.] do_lookup_x > 2.17% hello libc-2.12.90.so [.] _init > 2.17% hello libc-2.12.90.so [.] _IO_file_overflow_internal > -- > To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
