Hi all, I am trying to understand something about perf record. In its guide, perf record could use option -T to generate sample timestamp, and then use perf report -D to get them.
However, what I get from perf report -D is something as follows. Does anyone have an idea what content of perf.data means? # ========pei-OptiPlex-960:~$ # captured on: Fri Aug 9 15:58:02 2013 # hostname : peipei-OptiPlex-960 # os release : 3.2.0-49-generic-pae # perf version : 3.2.46 # arch : i686 # nrcpus online : 4 # nrcpus avail : 4 # cpudesc : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz # cpuid : GenuineIntel,6,23,10 # total memory : 8134988 kB # cmdline : /usr/bin/perf_3.2.0-49 record -T sleep 3 # event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, e # HEADER_CPU_TOPOLOGY info available, use -I to display # ======== # 0x128 [0x50]: event: 1 . . ... raw event: size 80 bytes . 0000: 01 00 00 00 01 00 50 00 ff ff ff ff 00 00 00 00 ......P......... . 0010: 00 00 00 c1 00 00 00 00 ff 9f 41 37 00 00 00 00 ..........A7.... . 0020: 00 00 00 c1 00 00 00 00 5b 6b 65 72 6e 65 6c 2e ........[kernel. . 0030: 6b 61 6c 6c 73 79 6d 73 5d 5f 74 65 78 74 00 00 kallsyms]_text.. . 0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ . 0 0x128 [0x50]: PERF_RECORD_MMAP -1/0: [0xc1000000(0x37419fff) @ 0xc1000000]: [k 0x178 [0x80]: event: 1 . . ... raw event: size 128 bytes . 0000: 01 00 00 00 01 00 80 00 ff ff ff ff 00 00 00 00 ................ . 0010: 00 a0 41 f8 00 00 00 00 ff 5f 00 00 00 00 00 00 ..A......_...... . 0020: 00 00 00 00 00 00 00 00 2f 6c 69 62 2f 6d 6f 64 ......../lib/mod . 0030: 75 6c 65 73 2f 33 2e 32 2e 30 2d 34 39 2d 67 65 ules/3.2.0-49-ge . 0040: 6e 65 72 69 63 2d 70 61 65 2f 6b 65 72 6e 65 6c neric-pae/kernel . 0050: 2f 64 72 69 76 65 72 73 2f 70 6c 61 74 66 6f 72 /drivers/platfor . 0060: 6d 2f 78 38 36 2f 77 6d 69 2e 6b 6f 00 00 00 00 m/x86/wmi.ko.... . 0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ . 0 0x178 [0x80]: PERF_RECORD_MMAP -1/0: [0xf841a000(0x5fff) @ 0]: /lib/modules/3. 0x1f8 [0x88]: event: 1 . . ... raw event: size 136 bytes . 0000: 01 00 00 00 01 00 88 00 ff ff ff ff 00 00 00 00 ................ . 0010: 00 00 42 f8 00 00 00 00 ff 6f 00 00 00 00 00 00 ..B......o...... . 0020: 00 00 00 00 00 00 00 00 2f 6c 69 62 2f 6d 6f 64 ......../lib/mod . 0030: 75 6c 65 73 2f 33 2e 32 2e 30 2d 34 39 2d 67 65 ules/3.2.0-49-ge . 0040: 6e 65 72 69 63 2d 70 61 65 2f 6b 65 72 6e 65 6c neric-pae/kernel . 0050: 2f 64 72 69 76 65 72 73 2f 69 32 63 2f 61 6c 67 /drivers/i2c/alg . 0060: 6f 73 2f 69 32 63 2d 61 6c 67 6f 2d 62 69 74 2e os/i2c-algo-bit. . 0070: 6b 6f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ko.............. . 0080: 00 00 00 00 00 00 00 00 ........ . 0 0x1f8 [0x88]: PERF_RECORD_MMAP -1/0: [0xf8420000(0x6fff) @ 0]: /lib/modules/3. Thanks for your help. Yours, Wang Peipei -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
