Vasily Averin
38a71bbbe2
trigger_next should increase position index ...
[ Upstream commit 6722b23e7a2ace078344064a9735fb73e554e9ef ]
if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.
Without patch:
# dd bs=30 skip=1 if=/sys/kernel/tracing/events/sched/sched_switch/trigger
dd: /sys/kernel/tracing/events/sched/sched_switch/trigger: cannot skip to specified offset
n traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
# Available triggers:
# traceon traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
6+1 records in
6+1 records out
206 bytes copied, 0.00027916 s, 738 kB/s
Notice the printing of "# Available triggers:..." after the line.
With the patch:
# dd bs=30 skip=1 if=/sys/kernel/tracing/events/sched/sched_switch/trigger
dd: /sys/kernel/tracing/events/sched/sched_switch/trigger: cannot skip to specified offset
n traceoff snapshot stacktrace enable_event disable_event enable_hist disable_hist hist
2+1 records in
2+1 records out
88 bytes copied, 0.000526867 s, 167 kB/s
It only prints the end of the file, and does not restart.
Link: http://lkml.kernel.org/r/3c35ee24-dd3a-8119-9c19-552ed253388a@virtuozzo.com
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-02-28 15:42:40 +01:00
tracing/blktrace: Fix to allow setting same value
2018-09-09 20:01:22 +02:00
bpf: fix check of allowed specifiers in bpf_trace_printk
2018-12-17 09:38:33 +01:00
ftrace: fpid_next() should increase position index
2020-02-28 15:42:40 +01:00
This release cycle is rather small. Just a few fixes to tracing.
2016-10-06 11:48:41 -07:00
Disable the __builtin_return_address() warning globally after all
2016-10-12 10:23:41 -07:00
cpufreq: schedutil: New governor based on scheduler utilization data
2016-04-02 01:09:12 +02:00
trace: Fix preempt_enable_no_resched() abuse
2019-05-02 09:32:00 +02:00
ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark
2015-11-03 16:19:02 -05:00
tracing: Initialize iter->seq after zeroing in tracing_read_pipe()
2019-11-06 12:18:13 +01:00
tracing: Silence GCC 9 array bounds warning
2019-07-10 09:55:28 +02:00
tracing: Only benchmark the time tracepoints take if tracing is on
2015-11-02 13:34:58 -05:00
tracing: Remove {start,stop}_branch_trace
2015-10-21 10:10:09 -04:00
tracing: Add NMI tracing in hwlat detector
2016-09-02 12:47:55 -04:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2016-05-17 16:26:30 -07:00
tracing: Fix partial reading of trace event's id file
2019-05-25 18:26:49 +02:00
tracing: Fix regex_match_front() to not over compare the test string
2018-05-16 10:08:43 +02:00
tracing: Use strncpy instead of memcpy for string keys in hist triggers
2019-03-23 13:19:45 +01:00
trigger_next should increase position index
2020-02-28 15:42:40 +01:00
tracing: ftrace_event_is_function() can return boolean
2015-11-02 14:28:05 -05:00
ftrace: Have set_ftrace_pid use the bitmap like events do
2016-06-20 09:54:19 -04:00
tracing: Fix missing return symbol in function_graph output
2018-07-11 16:26:43 +02:00
tracing/hwlat: Don't ignore outer-loop duration when calculating max_latency
2019-10-17 13:42:46 -07:00
tracing: Remove redundant reset per-CPU buff in irqsoff tracer
2016-03-18 16:39:11 -04:00
tracing: Silence GCC 9 array bounds warning
2019-07-10 09:55:28 +02:00
tracing: Quiet gcc warning about maybe unused link variable
2018-08-03 07:55:12 +02:00
tracing: Expose CPU physical addresses (resource values) for PCI devices
2016-06-20 09:54:22 -04:00
tracing: Fix typoes in code comment and printk in trace_nop.c
2016-03-08 11:23:57 -05:00
tracing: Add NMI tracing in hwlat detector
2016-09-02 12:47:55 -04:00
tracing: Handle NULL formats in hold_module_trace_bprintk_format()
2016-06-20 09:46:12 -04:00
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:39:23 +02:00
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:39:23 +02:00
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:04:26 +01:00
ftrace: Fix selftest goto location on error
2017-09-27 14:39:23 +02:00
tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined
2020-01-14 20:04:26 +01:00
tracing: Fix very unlikely race of registering two stat tracers
2020-02-28 15:42:21 +01:00
tracing/syscalls: fix multiline in error message text
2016-09-29 10:25:23 +02:00
tracing/uprobes: Fix output for multiple string arguments
2019-02-20 10:18:32 +01:00
tracing: Have the histogram compare functions convert to u64 first
2020-01-12 11:24:14 +01:00
tracing: Update some tracing_map constants and comments
2016-04-19 12:16:06 -04:00
38a71bbbe2