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library: extend cpu jiff logic beyond cpu summary info

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There was not a way I could see to support top's needs
for cpu information with the new 'chained' provisions.
The sheer quantity of such data plus the unpredictable
number of potential processors suggested a totally new
approach was warranted while keeping internals opaque.

So this patch introduces two new structures solely for
use by potential callers (as seen in the API). They're
responsible for providing them to the library which is
then responsible for filling them with requested data.

The top program will continue to provide numa support,
without involving the library in any of those details.
[ not to mention all the 'dl' and 'stderr' numa crap ]

With this transfer of the cpu tics duty to our library
the provision associated with the CPU_ZEROTICS #define
could not initially be migrated. The commit referenced
below suggests it may have lost its importance. In any
case such logic may yet be incorporated in the future.
But for now, that #define has been completely removed.

Reference(s):
commit ee3ed4b45e

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2015-06-28 00:00:00 -05:00
committed by Craig Small
parent 74beff80ff
commit 73d7a18d66
3 changed files with 283 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
proc/readstat.h
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@ -52,6 +52,16 @@ struct procps_cpu_result {
struct procps_cpu_result *next;
};
struct procps_jiffs {
jiff user, nice, system, idle, iowait, irq, sirq, stolen, guest, gnice;
};
struct procps_jiffs_hist {
struct procps_jiffs new;
struct procps_jiffs old;
int id;
};
struct procps_sys_result {
enum procps_stat_item item;
int result;
@ -62,12 +72,17 @@ struct procps_statinfo;
int procps_stat_new (struct procps_statinfo **info);
int procps_stat_read (struct procps_statinfo *info, const int cpu_only);
int procps_stat_read_jiffs (struct procps_statinfo *info);
struct procps_statinfo *procps_stat_ref (struct procps_statinfo *info);
struct procps_statinfo *procps_stat_unref (struct procps_statinfo *info);
jiff procps_stat_get_cpu (struct procps_statinfo *info, enum procps_cpu_item item);
int procps_stat_get_cpu_chain (struct procps_statinfo *info, struct procps_cpu_result *item);
int procps_stat_get_jiffs (struct procps_statinfo *info, struct procps_jiffs *item, int which);
int procps_stat_get_jiffs_all (struct procps_statinfo *info, struct procps_jiffs *item, int numitems);
int procps_stat_get_jiffs_hist (struct procps_statinfo *info, struct procps_jiffs_hist *item, int which);
int procps_stat_get_jiffs_hist_all (struct procps_statinfo *info, struct procps_jiffs_hist *item, int numitems);
unsigned int procps_stat_get_sys (struct procps_statinfo *info, enum procps_stat_item item);
int procps_stat_get_sys_chain (struct procps_statinfo *info, struct procps_sys_result *item);