Messages in this thread | | | Date | Fri, 16 Oct 2009 10:32:42 +0200 | From | Ingo Molnar <> | Subject | Re: perf trace errors |
| |
* Christoph Hellwig <hch@lst.de> wrote:
> I get some rather interesting errors using perf trace with the block > tracepoints on current mainline, e.g.: > > perf record -f -e 'block:block_bio_queue:record' -R -F 1 -a -s > <do some disk I/O end then ctrl+c> > ^C[ perf record: Woken up 1 times to write data ] > [ perf record: Captured and wrote 0.237 MB perf.data (~10362 samples) ] > > brick:/home/hch# perf trace > Fatal: unknown op '-' > xfssyncd-4232 [000] 87.798249255: block_bio_queue: 253, > > There are lots of occurances of that exactly same warning in > builtin-trace.c, and the code sourrouning them is sufficiently enough > convoluted that I'm not able to track it down.
FYI, these bugs are fixed in latest -tip, your testcase works for me:
aldebaran:~/linux/linux/tools/perf> perf record -f -e 'block:block_bio_queue:record' -R -F 1 -a -s ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.027 MB perf.data (~1168 samples) ]
aldebaran:~/linux/linux/tools/perf> perf trace kjournald-1406 [000] 10900.853086: block_bio_queue: 8,0 W 68735 + 8 [kjournald] kjournald-1406 [000] 10900.853097: block_bio_queue: 8,0 W 68743 + 8 [kjournald] kjournald-1406 [000] 10900.853100: block_bio_queue: 8,0 W 68751 + 8 [kjournald] kjournald-1406 [000] 10900.853103: block_bio_queue: 8,0 W 68759 + 8 [kjournald] flush-8:0-20110 [007] 10900.853117: block_bio_queue: 8,0 W 64487535 + 8 [flush-8:0] flush-8:0-20110 [007] 10900.853129: block_bio_queue: 8,0 W 64487551 + 8 [flush-8:0] flush-8:0-20110 [007] 10900.853138: block_bio_queue: 8,0 W 64487559 + 8 [flush-8:0] flush-8:0-20110 [007] 10900.853149: block_bio_queue: 8,0 W 64700511 + 8 [flush-8:0] sync-16876 [008] 10900.851948: block_bio_queue: 8,0 R 3218919 + 40 [sync] sync-16876 [008] 10900.853062: block_bio_queue: 8,0 W 63 + 8 [sync] sync-16876 [008] 10900.853067: block_bio_queue: 8,0 W 71 + 8 [sync] sync-16876 [008] 10900.853071: block_bio_queue: 8,0 W 79 + 8 [sync] sync-16876 [008] 10900.853077: block_bio_queue: 8,0 W 15466559 + 8 [sync] sync-16876 [011] 10900.840473: block_bio_queue: 8,0 R 3218887 + 32 [bash]
Mind checking whether it works for you?
Thanks,
Ingo
| |