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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLE | FILES | SEE ALSO | AUTHOR | REPORTING BUGS | LICENSE | RESOURCES | NOTES | COLOPHON |
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LIBTRACEEVENT(3) libtraceevent Manual LIBTRACEEVENT(3)
tep_get_page_size, tep_set_page_size,
tep_get_sub_buffer_data_size, tep_get_sub_buffer_size - Get / set
the size of a memory page on the machine, where the trace is
generated
#include <event-parse.h>
int tep_get_page_size(struct tep_handle *tep);
void tep_set_page_size(struct tep_handle *tep, int page_size);
int tep_get_sub_buffer_size(struct tep_handle *tep);
int tep_get_sub_buffer_data_size(struct tep_handle *tep);
int tep_get_sub_buffer_commit_offset(struct tep_handle *tep);
The tep_get_page_size() function returns the size of a memory page
on the machine, where the trace is generated. The tep argument is
trace event parser context.
The tep_set_page_size() function stores in the tep context the
size of a memory page on the machine, where the trace is
generated. The tep argument is trace event parser context. The
page_size argument is the size of a memory page, in bytes.
The tep_get_sub_buffer_size() returns the size of each "sub
buffer" of the ring buffer. The Linux kernel ring buffer is broken
up into sections called sub buffers. This returns the size of
those buffers.
The tep_get_sub_buffer_data_size() returns the size of just the
data portion of the sub buffers.
The tep_get_sub_buffer_commit_offset() returns the offset on the
sub buffer that holds the committed portion of data. This number
contains the index from the data portion of the sub buffer that is
the end of the last element on the sub buffer.
The tep_get_page_size() function returns size of the memory page,
in bytes.
The tep_get_sub_buffer_size() function returns the number of bytes
each sub buffer is made up of.
The tep_get_sub_buffer_commit_offset() function returns the
location on the sub buffer that contains the index of the last
element.
#include <unistd.h>
#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...
int page_size = getpagesize();
tep_set_page_size(tep, page_size);
printf("The page size for this machine is %d\n", tep_get_page_size(tep));
event-parse.h
Header file to include in order to have access to the library APIs.
-ltraceevent
Linker switch to add when building a program that uses the library.
libtraceevent(3), trace-cmd(1)
Steven Rostedt <rostedt@goodmis.org[1]>, author of libtraceevent.
Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>, author of this man page.
Report bugs to <linux-trace-devel@vger.kernel.org[3]>
libtraceevent is Free Software licensed under the GNU LGPL 2.1
https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
1. rostedt@goodmis.org
mailto:rostedt@goodmis.org
2. tz.stoyanov@gmail.com
mailto:tz.stoyanov@gmail.com
3. linux-trace-devel@vger.kernel.org
mailto:linux-trace-devel@vger.kernel.org
This page is part of the libtraceevent (Linux kernel trace event
library) project. Information about the project can be found at
⟨https://www.trace-cmd.org/⟩. If you have a bug report for this
manual page, see ⟨https://www.trace-cmd.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git⟩
on 2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-05-30.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
libtraceevent 1.8.2 06/07/2024 LIBTRACEEVENT(3)
Pages that refer to this page: tracefs_instance_get_subbuf_size(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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