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library: refactor meminfo providing dynamic allocation

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An earlier approach to meminfo chaining, referenced in
the patch shown below, represents the first baby steps
toward the goal of some generalized approach with PIDs
processing. However, statically allocating a chain for
each task or thread is totally impractical. And, while
a single chain could serve all PIDs, that would mean a
separate call to our library for each running process.

This commit is intended as the next evolutionary step,
dynamically allocating some 'result' chains to contain
as many or as few 'items' as a caller wishes. In other
words, holding only those 'items' of current interest.

This is the kind of service useful for both top and ps
programs if we finally get around to /proc/<PID> data.

Reference(s):
commit c3fd7473c5

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2015-07-11 00:00:00 -05:00
committed by Craig Small
parent cf6c2155dc
commit aab537bc13
3 changed files with 243 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
proc/meminfo.h
View File

@ -19,6 +19,7 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PROC_MEMINFO_H
#define PROC_MEMINFO_H
@ -44,16 +45,22 @@ enum meminfo_item {
PROCPS_MEM_USED,
PROCPS_SWAP_FREE,
PROCPS_SWAP_TOTAL,
PROCPS_SWAP_USED
PROCPS_SWAP_USED,
PROCPS_MEM_noop
};
struct procps_meminfo;
struct meminfo_result {
enum meminfo_item item;
unsigned long result;
struct meminfo_result *next;
};
struct procps_meminfo;
struct meminfo_chain {
struct meminfo_result *head;
};
int procps_meminfo_new (struct procps_meminfo **info);
int procps_meminfo_read (struct procps_meminfo *info);
@ -61,9 +68,22 @@ int procps_meminfo_read (struct procps_meminfo *info);
int procps_meminfo_ref (struct procps_meminfo *info);
int procps_meminfo_unref (struct procps_meminfo **info);
unsigned long procps_meminfo_get (struct procps_meminfo *info, enum meminfo_item item);
int procps_meminfo_get_chain (struct procps_meminfo *info, struct meminfo_result *item);
unsigned long procps_meminfo_get (
struct procps_meminfo *info,
enum meminfo_item item);
int procps_meminfo_getchain (
struct procps_meminfo *info,
struct meminfo_result *these);
int procps_meminfo_chain_fill (
struct procps_meminfo *info,
struct meminfo_chain *chain);
struct meminfo_chain *procps_meminfo_chain_alloc (
struct procps_meminfo *info,
int maxitems,
enum meminfo_item *items);
__END_DECLS
#endif