Man page - trace-cmd-snapshot(1)

Packages contains this manual

Package:  trace-cmd
apt-get install trace-cmd

Manuals in package:
• tracecmd_follow_missed_events(3)
• trace-cmd-mem(1)
• trace-cmd(1)
• trace-cmd-hist(1)
• tracecmd_map_get_guest(3)
• trace-cmd-sqlhist(1)
• tracecmd_read_cpu_first(3)
• trace-cmd-convert(1)
• tracecmd_iterate_events(3)
• trace-cmd-check-events(1)
• trace-cmd-start(1)
• tracecmd_map_set_private(3)
• tracecmd_get_tsc2nsec(3)
• tracecmd_read_at(3)
• tracecmd_filter_add(3)
• trace-cmd-report(1)
• tracecmd_get_cpu_map(3)
• trace-cmd-profile(1)
• trace-cmd-set(1)
• trace-cmd-show(1)
• trace-cmd-dump(1)
• trace-cmd-snapshot(1)
• tracecmd_map_get_private(3)
• trace-cmd-stream(1)
• trace-cmd-clear(1)
• tracecmd_iterate_reset(3)
• trace-cmd-listen(1)
• tracecmd_iterate_events_multi(3)
• trace-cmd-list(1)
• tracecmd_open_fd(3)
• tracecmd_add_ts_offset(3)
• tracecmd_buffer_instance_name(3)
• tracecmd_get_private(3)
• tracecmd_map_get_host_pid(3)
• tracecmd_set_private(3)
• trace-cmd-options(1)
• tracecmd_buffer_instances(3)
• tracecmd_read_data(3)
• trace-cmd-attach(1)
• tracecmd_free_record(3)
• tracecmd_set_loglevel(3)
• tracecmd_get_first_ts(3)
• tracecmd_init_data(3)
• trace-cmd-stat(1)
• tracecmd_get_traceid(3)
• tracecmd_close(3)
• tracecmd_follow_event(3)
• trace-cmd-reset(1)
• tracecmd_open_head(3)
• tracecmd_map_find_by_host_pid(3)
• trace-cmd.dat.v7(5)
• trace-cmd-stack(1)
• trace-cmd-agent(1)
• tracecmd_map_vcpus(3)
• tracecmd_get_guest_cpumap(3)
• libtracecmd(3)
• trace-cmd-stop(1)
• trace-cmd.dat.v6(5)
• tracecmd_get_tep(3)
• trace-cmd-restore(1)
• trace-cmd-extract(1)
• tracecmd_buffer_instance_handle(3)
• trace-cmd-record(1)
• tracecmd_open(3)
• trace-cmd-split(1)
Documentations in package:
• trace-cmd

Manual

TRACE-CMD-SNAPSHOT

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR
RESOURCES
COPYING
NOTES

---

NAME

trace-cmd-snapshot - take, reset, free, or show a Ftrace kernel snapshot

SYNOPSIS

trace-cmd snapshot [ OPTIONS ]

DESCRIPTION

The trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel snapshot feature (if the kernel supports it). This is useful to "freeze" an instance of a live trace but without stopping the trace.

trace-cmd start -p function
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the content of buffer at 'trace-cmd snapshot -s' ]
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the new content of the buffer at the last -s operation ]

OPTIONS

-s

Take a snapshot of the currently running buffer.

-r

Clear out the buffer.

-f

Free the snapshot buffer. The buffer takes up memory inside the kernel. It is best to free it when not in use. The first -s operation will allocate it if it is not already allocated.

-c cpu

Operate on a per cpu snapshot (may not be fully supported by all kernels)

-B buf

If a buffer instance was created, then the -B option will operate on the snapshot within the buffer.

SEE ALSO

trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1)

AUTHOR

Written by Steven Rostedt, < rostedt@goodmis.org [1] >

RESOURCES

https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/

COPYING

Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

1.

rostedt@goodmis.org

mailto:rostedt@goodmis.org

---