On Tue, Dec 15 2009, Edward Shishkin wrote:
>
> Fixup for 513950.
>
> Problem:
> 'blktrace -d <device> -k' does not kill a running
> backgound trace. Executing 'blktrace -d <device> -k'
> for the second time results in "BLKTRACETEARDOWN:
> Invalid argument" message and then each run of
> blktrace on that machine prints the following output:
> BLKTRACESETUP: No such file or directory.
>
> The bug:
> The option -k results in clobbering information
> about running trace by kernel (blk_trace_remove),
> while resources (files open in debugfs by the running
> background blktrace) are not released.
>
> Solution:
> . Disable non-working "kill" option;
> . Update documentation, advise to send SIGINT signal
> via kill(1) to the running background blktrace for
> its correct termination.
Patch does not compile:
gcc -o blktrace.o -c -Wall -O2 -g -W -D_GNU_SOURCE -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 blktrace.c
blktrace.c:446: error: stray ?#? in program
blktrace.c:453: error: expected ?,? or ?;? before ?if?
blktrace.c:454: error: stray ?#? in program
make: *** [blktrace.o] Error 1
"\t-D Directory to prepend to output file names\n" \
#if KILL_OPT_ENABLED
"\t-k Kill a running trace\n" \
#endif /* KILL_OPT_ENABLED */
"\t-w Stop after defined time, in seconds\n" \
--
Jens Axboe
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