diff options
| -rw-r--r-- | usr.bin/top/machine.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/usr.bin/top/machine.c b/usr.bin/top/machine.c index 180d67b9b714..0cd412644bf0 100644 --- a/usr.bin/top/machine.c +++ b/usr.bin/top/machine.c @@ -415,17 +415,39 @@ get_system_info(struct system_info *si) #define NOPROC ((void *)-1) +/* + * We need to compare data from the old process entry with the new + * process entry. + * To facilitate doing this quickly we stash a pointer in the kinfo_proc + * structure to cache the mapping. We also use a negative cache pointer + * of NOPROC to avoid duplicate lookups. + * XXX: this could be done when the actual processes are fetched, we do + * it here out of laziness. + */ const struct kinfo_proc * get_old_proc(struct kinfo_proc *pp) { struct kinfo_proc **oldpp, *oldp; + /* + * If this is the first fetch of the kinfo_procs then we don't have + * any previous entries. + */ if (previous_proc_count == 0) return (NULL); + /* negative cache? */ if (pp->ki_udata == NOPROC) return (NULL); + /* cached? */ if (pp->ki_udata != NULL) return (pp->ki_udata); + /* + * Not cached, + * 1) look up based on pid. + * 2) compare process start. + * If we fail here, then setup a negative cache entry, otherwise + * cache it. + */ oldpp = bsearch(&pp, previous_pref, previous_proc_count, sizeof(*previous_pref), compare_pid); if (oldpp == NULL) { @@ -441,6 +463,10 @@ get_old_proc(struct kinfo_proc *pp) return (oldp); } +/* + * Return the total amount of IO done in blocks in/out and faults. + * store the values individually in the pointers passed in. + */ long get_io_stats(struct kinfo_proc *pp, long *inp, long *oup, long *flp) { @@ -464,6 +490,9 @@ get_io_stats(struct kinfo_proc *pp, long *inp, long *oup, long *flp) return (ret); } +/* + * Return the total number of block in/out and faults by a process. + */ long get_io_total(struct kinfo_proc *pp) { |