i2p/haiku-beta6
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

scheduler: Estimate the load thread is able to produce

Browse Source 
Previous implementation based on the actual load of each core and share
each thread has in that load turned up to be very problematic when
balancing load on very heavily loaded systems (i.e. more threads
consuming all available CPU time than there is logical CPUs).

The new approach is to estimate how much load would a thread produce
if it had all CPU time only for itself. Summing such load estimations
of each thread assigned to a given core we get a rank that contains
much more information than just simple actual core load.
This commit is contained in:
Pawel Dziepak
2014-01-09 03:50:54 +01:00
parent 772331c7cd
commit a2634874ed
10 changed files with 186 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
headers/private/kernel/load_tracking.h
+2 -3
View File
@@ -15,10 +15,9 @@ const bigtime_t kIntervalInaccuracy = kLoadMeasureInterval / 4;
static inline int32
compute_load(bigtime_t& measureTime, bigtime_t& measureActiveTime, int32& load)
compute_load(bigtime_t& measureTime, bigtime_t& measureActiveTime, int32& load,
bigtime_t now)
{
bigtime_t now = system_time();
if (measureTime == 0) {
measureTime = now;
return -1;