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library: allow negative delta values for 2, <STAT> api

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A recent buglet in the <meminfo> interface, where many
delta values could legitimately be negative, suggested
a review of this module where a minus was forced to 0.

As it turns out, there are two delta items that indeed
could be negative. They involve the current processes.

So henceforth, DELTA_PROC_BLOCKED & DELTA_PROC_RUNNING
will now be allowed to go negative. I believe that all
other items can only grow. But, if we find more later,
at least the adaptation approach has been established.

[ this whole business of checking for less than zero ]
[ harks back to an old kernel anomaly where negative ]
[ tics were sometimes experienced. top was affected. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2016-05-11 18:18:18 -05:00 committed by Craig Small
parent 78043f6751
commit fac5e6fea0
1 changed files with 6 additions and 6 deletions
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12
proc/stat.c
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@ -136,11 +136,11 @@ struct procps_statinfo {
(void)T; R->result. t = ( S->new . x - S->old. x ); \
if (R->result. t < 0) R->result. t = 0; }
setDECL(noop) { (void)R; (void)S; (void)T; }
setDECL(extra) { (void)R; (void)S; (void)T; }
setDECL(noop) { (void)R; (void)S; (void)T; }
setDECL(extra) { (void)R; (void)S; (void)T; }
setDECL(TIC_ID) { (void)S; R->result.s_int = T->id; }
setDECL(TIC_NUMA_NODE) { (void)S; R->result.s_int = T->numa_node; }
setDECL(TIC_ID) { (void)S; R->result.s_int = T->id; }
setDECL(TIC_NUMA_NODE) { (void)S; R->result.s_int = T->numa_node; }
TIC_set(TIC_USER, ull_int, user)
TIC_set(TIC_NICE, ull_int, nice)
TIC_set(TIC_SYSTEM, ull_int, system)
@ -170,9 +170,9 @@ SYS_set(SYS_PROC_RUNNING, ul_int, procs_running)
SYS_set(SYS_TIME_OF_BOOT, ul_int, btime)
SYS_hst(SYS_DELTA_CTX_SWITCHES, s_int, ctxt)
SYS_hst(SYS_DELTA_INTERRUPTS, s_int, intr)
SYS_hst(SYS_DELTA_PROC_BLOCKED, s_int, procs_blocked)
setDECL(SYS_DELTA_PROC_BLOCKED) { (void)T; R->result.s_int = S->new.procs_blocked - S->old.procs_blocked; }
SYS_hst(SYS_DELTA_PROC_CREATED, s_int, procs_created)
SYS_hst(SYS_DELTA_PROC_RUNNING, s_int, procs_running)
setDECL(SYS_DELTA_PROC_RUNNING) { (void)T; R->result.s_int = S->new.procs_running - S->old.procs_running; }
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||