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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 <[email protected][1]>, author of libtraceevent.
Tzvetomir Stoyanov <[email protected][2]>, author of this man page.
Report bugs to <[email protected][3]>
libtraceevent is Free Software licensed under the GNU LGPL 2.1
https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
1. [email protected]
mailto:[email protected]
2. [email protected]
mailto:[email protected]
3. [email protected]
mailto:[email protected]
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 2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-05-17.) 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 [email protected]
libtraceevent 1.8.2 06/07/2024 LIBTRACEEVENT(3)
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HTML rendering created 2024-06-26 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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