sg_get_page_stats(3)sg_get_page_stats(3)NAME
sg_get_page_stats, sg_get_page_stats_r, sg_get_page_stats_diff,
sg_get_page_stats_diff_between, sg_free_page_stats - get paging statis‐
tics
SYNOPSIS
#include <statgrab.h>
sg_page_stats *sg_get_page_stats (size_t *entries);
sg_page_stats *sg_get_page_stats_r (size_t *entries);
sg_page_stats *sg_get_page_stats_diff (size_t *entries);
sg_page_stats *sg_get_page_stats_diff_between (const sg_page_stats
*cur, const sg_page_stats *last, size_t *entries);
sg_error sg_free_page_stats (sg_page_stats *data);
DESCRIPTION
The page stats module deliver the number of pages swapped in and out,
either since the machine has been booted (by the sg_get_page_stats()
and sg_get_page_stats_r() functions) or the difference between two mea‐
sured statistics (by the sg_get_page_stats_diff() and
sg_get_page_stats_diff_between() functions).
The sg_get_page_stats_diff() function calculates the difference between
the last call to the function sg_get_page_stats() in this thread (the
statistics of the earlier call are saved and sg_get_page_stats() is
called immediately after this).
API Shortcut
┌───────────────────────────┬─────────────────┬─────────────────────┐
│function │ returns │ data owner │
├───────────────────────────┼─────────────────┼─────────────────────┤
│sg_get_page_stats │ sg_page_stats * │ libstatgrab (thread │
│ │ │ local) │
├───────────────────────────┼─────────────────┼─────────────────────┤
│sg_get_page_stats_r │ sg_page_stats * │ caller │
├───────────────────────────┼─────────────────┼─────────────────────┤
│sg_get_page_stats_diff │ sg_page_stats * │ libstatgrab (thread │
│ │ │ local) │
├───────────────────────────┼─────────────────┼─────────────────────┤
│sg_get_page_stats_diff_be‐ │ sg_page_stats * │ caller │
│tween │ │ │
└───────────────────────────┴─────────────────┴─────────────────────┘
The sg_page_stats buffer received from sg_get_page_stats_r() and the
sg_get_page_stats_diff_between() must be freed using
sg_free_page_stats() when not needed any more. The caller is responsi‐
ble for doing it.
RETURN VALUES
typedef struct{
unsigned long long pages_pagein;
unsigned long long pages_pageout;
time_t systime;
}sg_page_stats;
pages_pagein
The number of pages swapped into memory.
pages_pageout
The number of pages swapped out of memory (to swap).
systime
The timestamp when the above stats where collected in seconds
since epoch or the time period over which pages_pagein and
pages_pageout were transferred.
BUGS
Solaris doesn't seem to report accurately. It reports the number of
pages swapped into memory, not necessarily from swap. This feature
isn't deemed entirely reliable.
SEE ALSOstatgrab(3)WEBSITE
⟨http://www.i-scream.org/libstatgrab/⟩
i-scream 2013-06-17 sg_get_page_stats(3)
