New kernel events can be added at various location for sampling or counting.
This will for example allow easy system profiling whatever the processor is
with known tools like pmcstat(8).
Simultaneous usage of software PMC and hardware PMC is possible, for example
looking at the lock acquire failure, page fault while sampling on
instructions.
Sponsored by: NETASQ
MFC after: 1 month
In case of multiple level of inlining all the locations are flattened.
Require recent binutils/addr2line (head works or binutils from ports
with the right $PATH order).
- Multiple fixes in the calltree output (recursion case, ...)
- Fix the calltree top view that previously hide some shared nodes.
Tested with Kcachegrind(kdesdk4)/qcachegrind(head).
Sponsored by: NETASQ
error: variable 'current_cpu' set but not used
Approved by: dim, cperciva (mentor, blanket for pre-mentorship already-approved commits)
MFC after: 3 days
As the underlying block is 4KB if the PMC throughput is low the measurement
will be reported on the next tick. pmcstat(8) use the modified flush API to
reclaim current buffer before displaying next top.
MFC after: 1 month
ints. That fixes a first bug where pmcstat wasn't using the old
cpumask_t interface and now also brings the full support for more
than 32 cpus.
While here, make the functions pmcstat_clone_event_descriptor() and
pmcstat_get_cpumask() private to pmcstat.
The problem of assuming cpu dense masks still persists and should be
eventually fixed, as reported by avg.
Tested by: pluknet
Reviewed by: gnn
Approved by: re (kib)
will be spread as small value and then filtered by the threshold.
As a first step solution display the number of event that cannot
be resolved as a valid function location.
MFC after: 1week
This will allow top monitoring using socket/ssh tunnelling
of system without local symbols.
client:
pmcstat -R <ip>:<port> -T -r <symbolspath>
monitored device:
pmcstat -Sinstructions -O <ip>:<port>
- Move the file read in the event loop
- Initialize and clean log in all cases
- Preserve global stats value during top refresh
- Fix the rtld/line resolver that ignore '-r' prefix
- Support socket for '-R' (server mode)
- Display the statistics when exiting top mode
Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.
Reviewed by: ru
Approved by: philip, ed (mentors)
pmc_flush_logfile is now non-blocking and just ask the kernel
to shutdown the file. From that point, no more data is
accepted by the log thread and when the last buffer is flushed
the file is closed.
This will remove a deadlock between pmcstat asking for
flush while it cannot flush the pipe itself.
MFC after: 3 days
- no display on serial terminal in top mode.
- display alignment for continuation string.
- correct invalid value used for display limit.
MFC after: 3 days
- Kcachegrind (calltree) support with assembly/source
code mapping and call count estimator (-F).
- Top mode for calltree and callgraph plugin (-T).
MFC after: 1 month
Fix some wrong usages.
Note: this does not affect generated binaries as this argument is not used.
PR: 137213
Submitted by: Eygene Ryabinkin (initial version)
MFC after: 1 month
This option prints the list of sampled PCs along with the function name,
the start and end addresses of this where their live within.
Reviewed by: jkoshy
Tested by: gnn
Sponsored by: Nokia
- Print a warning if the version number recorded in the log is not what the
tool expects.
- Print a tidier error message when an unrecognized event is encountered
in the log.
- Don't print a spurious 'Unknown error: 0' when exiting after a parse
error.
- Allow the "-t" option to take a regular expression naming command
line processes to attach process PMCs to.
- Update the manual page and add an example showing the use of the
new functionality.
- Update the (c) year on the affected source files.
- The '-c' option now takes a comma-separated list of CPU
numbers, or a literal '*' denoting all CPUs in the system.
Subsequent system PMCs are allocated on the CPUs so specified.
Change the default behaviour to allocate system PMCs on all CPUs,
not just CPU 0.
Update the manual page and add an example of how to use the new
functionality.
- Attach PMCs to a (commandline) child process more reliably. This
fixes a long standing bug in counting events incurred by short-lived
processes.
