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Diffstat (limited to 'Documentation/libtraceevent-page_size.txt')
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diff --git a/Documentation/libtraceevent-page_size.txt b/Documentation/libtraceevent-page_size.txt new file mode 100644 index 0000000..6d0dd36 --- /dev/null +++ b/Documentation/libtraceevent-page_size.txt @@ -0,0 +1,90 @@ +libtraceevent(3) +================ + +NAME +---- +tep_get_page_size, tep_set_page_size, tep_get_sub_buffer_size - Get / set the size of a memory page on +the machine, where the trace is generated + +SYNOPSIS +-------- +[verse] +-- +*#include <event-parse.h>* + +int *tep_get_page_size*(struct tep_handle pass:[*]_tep_); +void *tep_set_page_size*(struct tep_handle pass:[*]_tep_, int _page_size_); +int *tep_get_sub_buffer_size*(struct tep_handle pass:[*]_tep_); +-- + +DESCRIPTION +----------- +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. + +RETURN VALUE +------------ +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. + +EXAMPLE +------- +[source,c] +-- +#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 +----- +[verse] +-- +*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. +-- + +SEE ALSO +-------- +*libtraceevent*(3), *trace-cmd*(1) + +AUTHOR +------ +[verse] +-- +*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. +*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. +-- +REPORTING BUGS +-------------- +Report bugs to <linux-trace-devel@vger.kernel.org> + +LICENSE +------- +libtraceevent is Free Software licensed under the GNU LGPL 2.1 + +RESOURCES +--------- +https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ |