libstatgrab/docs/page_stat.txt

Page Statistics
===============

$Id$

Data Structure
--------------

typedef struct{
        long long pages_pagein;
        long long pages_pageout;
        time_t systime;
}page_stat_t;

pages_pagein    is the number of pages swapped in to memory
pages_pageout   is the number of pages swapped out of memory (to swap)

Functions
---------

page_stat_t *get_page_stats();
page_stat_t *get_page_stats_diff();

get_page_stats() and get_page_stats_diff() both return a pointer
to a static buffer of type page_stat_t.

get_page_stats() will return the number of pages the system has
paged in and out since bootup. get_page_stats_diff() will return
the difference since last time it was called.  If it has not been
called before, it will return get_page_stats().

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 :)

Example
-------

An example can be found in examples/page_stats.c
Revision:	1.2
Committed:	Sun Aug 24 21:59:09 2003 UTC (20 years, 9 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_5_1, LIBSTATGRAB_0_5
Changes since 1.1:	+31 -13 lines
Log Message:	Tidy page_stat.txt, and add the page stats stuff to the Makefiles.
#	User	Rev	Content
1	tdb	1.2	Page Statistics
2			===============
3
4			$Id$
5
6			Data Structure
7			--------------
8	pajs	1.1
9			typedef struct{
10			long long pages_pagein;
11			long long pages_pageout;
12			time_t systime;
13			}page_stat_t;
14
15	tdb	1.2	pages_pagein is the number of pages swapped in to memory
16			pages_pageout is the number of pages swapped out of memory (to swap)
17	pajs	1.1
18	tdb	1.2	Functions
19			---------
20	pajs	1.1
21	tdb	1.2	page_stat_t *get_page_stats();
22			page_stat_t *get_page_stats_diff();
23
24			get_page_stats() and get_page_stats_diff() both return a pointer
25			to a static buffer of type page_stat_t.
26
27			get_page_stats() will return the number of pages the system has
28			paged in and out since bootup. get_page_stats_diff() will return
29			the difference since last time it was called. If it has not been
30			called before, it will return get_page_stats().
31
32			Bugs
33			----
34	pajs	1.1
35			Solaris doesn't seem to report accurately. It reports the number
36	tdb	1.2	of pages swapped into memory, not necessarily from swap. This feature
37			isn't deemed entirely reliable :)
38
39			Example
40			-------
41
42			An example can be found in examples/page_stats.c