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MXS-1669: Fix load average tracking

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The output of `show threads` could have a negative historic thread load
average that could be explained by the overflow of the signed 32-bit
integer used to count the number of samples.

The time that each thread started to process an event for a DCB used an
old value that is no longer used. Updating this to DCB::last_read retains
the 2.0 behavior.
This commit is contained in:
Markus Mäkelä 2018-02-15 10:35:12 +02:00
parent 9b9e7121c3
commit 1042b861bb
No known key found for this signature in database
GPG Key ID: 72D48FCE664F7B19
1 changed files with 5 additions and 5 deletions
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10
server/core/poll.c
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@ -125,7 +125,7 @@ SPINLOCK pollqlock = SPINLOCK_INIT;
* poll completion, a value of 1 or less is the ideal.
*/
static double load_average = 0.0;
static int load_samples = 0;
static uint64_t load_samples = 0;
static int load_nfds = 0;
static double current_avg = 0.0;
static double *avg_samples = NULL;
@ -755,7 +755,7 @@ poll_waitevents(void *arg)
pollStats.n_fds[(nfds < MAXNFDS ? (nfds - 1) : MAXNFDS - 1)]++;
load_average = (load_average * load_samples + nfds) / (load_samples + 1);
atomic_add(&load_samples, 1);
atomic_add_uint64(&load_samples, 1);
atomic_add(&load_nfds, nfds);
/*
@ -1368,7 +1368,7 @@ dShowThreads(DCB *dcb)
dcb_printf(dcb,
" %2d | %-10s | %6d | %-16p | <%3lu00ms | %s\n",
i, state, thread_data[i].n_fds,
thread_data[i].cur_dcb, 1 + hkheartbeat - dcb->evq.started,
thread_data[i].cur_dcb, 1 + hkheartbeat - dcb->last_read,
event_string);
if (from_heap)
@ -1388,8 +1388,8 @@ dShowThreads(DCB *dcb)
static void
poll_loadav(void *data)
{
static int last_samples = 0, last_nfds = 0;
int new_samples, new_nfds;
static uint64_t last_samples = 0, last_nfds = 0;
uint64_t new_samples, new_nfds;
new_samples = load_samples - last_samples;
new_nfds = load_nfds - last_nfds;