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Date: Sat, 21 Sep 2019 22:44:23 +0800
From: kbuild test robot <lkp@...el.com>
To: YT Chang <yt.chang@...iatek.com>
Cc: kbuild-all@...org, Peter Zijlstra <peterz@...radead.org>,
Matthias Brugger <matthias.bgg@...il.com>,
wsd_upstream@...iatek.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
YT Chang <yt.chang@...iatek.com>
Subject: Re: [PATCH 1/1] sched/eas: introduce system-wide overutil indicator
Hi YT,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190918]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
url: https://github.com/0day-ci/linux/commits/YT-Chang/sched-eas-introduce-system-wide-overutil-indicator/20190919-152213
config: x86_64-randconfig-s1-201937 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
:::::: branch date: 2 hours ago
:::::: commit date: 2 hours ago
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
kernel/sched/fair.c: In function 'update_system_overutilized':
>> kernel/sched/fair.c:5234:20: error: 'capacity_margin' undeclared (first use in this function)
group_util * capacity_margin)) {
^~~~~~~~~~~~~~~
kernel/sched/fair.c:5234:20: note: each undeclared identifier is reported only once for each function it appears in
# https://github.com/0day-ci/linux/commit/58f2ed2a11501d4de287fafc0a7b3385d54f8238
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 58f2ed2a11501d4de287fafc0a7b3385d54f8238
vim +/capacity_margin +5234 kernel/sched/fair.c
58f2ed2a11501d YT Chang 2019-09-19 5195
58f2ed2a11501d YT Chang 2019-09-19 5196 static
58f2ed2a11501d YT Chang 2019-09-19 5197 void update_system_overutilized(struct sched_domain *sd, struct cpumask *cpus)
58f2ed2a11501d YT Chang 2019-09-19 5198 {
58f2ed2a11501d YT Chang 2019-09-19 5199 unsigned long group_util;
58f2ed2a11501d YT Chang 2019-09-19 5200 bool intra_overutil = false;
58f2ed2a11501d YT Chang 2019-09-19 5201 unsigned long max_capacity;
58f2ed2a11501d YT Chang 2019-09-19 5202 struct sched_group *group = sd->groups;
58f2ed2a11501d YT Chang 2019-09-19 5203 struct root_domain *rd;
58f2ed2a11501d YT Chang 2019-09-19 5204 int this_cpu;
58f2ed2a11501d YT Chang 2019-09-19 5205 bool overutilized;
58f2ed2a11501d YT Chang 2019-09-19 5206 int i;
58f2ed2a11501d YT Chang 2019-09-19 5207
58f2ed2a11501d YT Chang 2019-09-19 5208 this_cpu = smp_processor_id();
58f2ed2a11501d YT Chang 2019-09-19 5209 rd = cpu_rq(this_cpu)->rd;
58f2ed2a11501d YT Chang 2019-09-19 5210 overutilized = READ_ONCE(rd->overutilized);
58f2ed2a11501d YT Chang 2019-09-19 5211 max_capacity = rd->max_cpu_capacity;
58f2ed2a11501d YT Chang 2019-09-19 5212
58f2ed2a11501d YT Chang 2019-09-19 5213 do {
58f2ed2a11501d YT Chang 2019-09-19 5214 group_util = 0;
58f2ed2a11501d YT Chang 2019-09-19 5215 for_each_cpu_and(i, sched_group_span(group), cpus) {
58f2ed2a11501d YT Chang 2019-09-19 5216 group_util += cpu_util(i);
58f2ed2a11501d YT Chang 2019-09-19 5217 if (cpu_overutilized(i)) {
58f2ed2a11501d YT Chang 2019-09-19 5218 if (capacity_orig_of(i) < max_capacity) {
58f2ed2a11501d YT Chang 2019-09-19 5219 intra_overutil = true;
58f2ed2a11501d YT Chang 2019-09-19 5220 break;
58f2ed2a11501d YT Chang 2019-09-19 5221 }
58f2ed2a11501d YT Chang 2019-09-19 5222 }
58f2ed2a11501d YT Chang 2019-09-19 5223 }
58f2ed2a11501d YT Chang 2019-09-19 5224
58f2ed2a11501d YT Chang 2019-09-19 5225 /*
58f2ed2a11501d YT Chang 2019-09-19 5226 * A capacity base hint for over-utilization.
58f2ed2a11501d YT Chang 2019-09-19 5227 * Not to trigger system overutiled if heavy tasks
58f2ed2a11501d YT Chang 2019-09-19 5228 * in Big.cluster, so
58f2ed2a11501d YT Chang 2019-09-19 5229 * add the free room(20%) of Big.cluster is impacted which means
58f2ed2a11501d YT Chang 2019-09-19 5230 * system-wide over-utilization,
58f2ed2a11501d YT Chang 2019-09-19 5231 * that considers whole cluster not single cpu
58f2ed2a11501d YT Chang 2019-09-19 5232 */
58f2ed2a11501d YT Chang 2019-09-19 5233 if (group->group_weight > 1 && (group->sgc->capacity * 1024 <
58f2ed2a11501d YT Chang 2019-09-19 @5234 group_util * capacity_margin)) {
58f2ed2a11501d YT Chang 2019-09-19 5235 intra_overutil = true;
58f2ed2a11501d YT Chang 2019-09-19 5236 break;
58f2ed2a11501d YT Chang 2019-09-19 5237 }
58f2ed2a11501d YT Chang 2019-09-19 5238
58f2ed2a11501d YT Chang 2019-09-19 5239 group = group->next;
58f2ed2a11501d YT Chang 2019-09-19 5240
58f2ed2a11501d YT Chang 2019-09-19 5241 } while (group != sd->groups && !intra_overutil);
58f2ed2a11501d YT Chang 2019-09-19 5242
58f2ed2a11501d YT Chang 2019-09-19 5243 if (overutilized != intra_overutil) {
58f2ed2a11501d YT Chang 2019-09-19 5244 if (intra_overutil == true) {
58f2ed2a11501d YT Chang 2019-09-19 5245 WRITE_ONCE(rd->overutilized, SG_OVERUTILIZED);
58f2ed2a11501d YT Chang 2019-09-19 5246 trace_sched_overutilized_tp(rd, SG_OVERUTILIZED);
58f2ed2a11501d YT Chang 2019-09-19 5247 } else {
58f2ed2a11501d YT Chang 2019-09-19 5248 WRITE_ONCE(rd->overutilized, 0);
58f2ed2a11501d YT Chang 2019-09-19 5249 trace_sched_overutilized_tp(rd, 0);
58f2ed2a11501d YT Chang 2019-09-19 5250 }
58f2ed2a11501d YT Chang 2019-09-19 5251 }
58f2ed2a11501d YT Chang 2019-09-19 5252 }
58f2ed2a11501d YT Chang 2019-09-19 5253
---
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