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tep_get_page_size(3) — Linux manual page

NAME \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|EXAMPLE \|FILES \|SEE ALSO \|AUTHOR \|REPORTING BUGS \|LICENSE \|RESOURCES \|NOTES \|COLOPHON

LIBTRACEEVENT(3)           libtraceevent ManualLIBTRACEEVENT(3)

NAME top

       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

SYNOPSIS top

#include <event-parse.h>       inttep_get_page_size(struct tep_handle *tep);       voidtep_set_page_size(struct tep_handle *tep, intpage_size);       inttep_get_sub_buffer_size(struct tep_handle *tep);       inttep_get_sub_buffer_data_size(struct tep_handle *tep);       inttep_get_sub_buffer_commit_offset(struct tep_handle *tep);

DESCRIPTION top

       Thetep_get_page_size()function returns the size of a memory page       on the machine, where the trace is generated. Thetep argument is       trace event parser context.       Thetep_set_page_size()function stores in thetep context the       size of a memory page on the machine, where the trace is       generated. Thetep argument is trace event parser context. Thepage_size argument is the size of a memory page, in bytes.       Thetep_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.       Thetep_get_sub_buffer_data_size()returns the size of just the       data portion of the sub buffers.       Thetep_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.

RETURN VALUE top

       Thetep_get_page_size()function returns size of the memory page,       in bytes.       Thetep_get_sub_buffer_size()function returns the number of bytes       each sub buffer is made up of.       Thetep_get_sub_buffer_commit_offset()function returns the       location on the sub buffer that contains the index of the last       element.

EXAMPLE top

           #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));

FILES top

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.

AUTHOR top

Steven Rostedt<rostedt@goodmis.org[1]>, author oflibtraceevent.Tzvetomir Stoyanov<tz.stoyanov@gmail.com[2]>, author of this man page.

REPORTING BUGS top

       Report bugs to <linux-trace-devel@vger.kernel.org[3]>

LICENSE top

       libtraceevent is Free Software licensed under the GNU LGPL 2.1

RESOURCES top

https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/

NOTES top

        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

COLOPHON top

       This page is part of thelibtraceevent (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 isnot part of the original manual page), send a       mail to man-pages@man7.orglibtraceevent 1.8.2             06/07/2024LIBTRACEEVENT(3)

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