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REPLY(-4.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; MISSING_XM_UA(0.00)[]; RCVD_TLS_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCPT_COUNT_FIVE(0.00)[6]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email,imap1.dmz-prg2.suse.org:helo] X-Virus-Scanned: clamav-milter 1.0.3 at in-4.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v2] sched: starvation: Autocallibrate the timeout X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alix.wu@mediatek.com, "joe.liu" , ltp@lists.linux.it, xufeifei1@oppo.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:161: TINFO: do_test by pid 4523 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:166: TINFO: main pid is 4523 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:167: TINFO: child pid is 4524 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:166: TINFO: main pid is 4524 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:167: TINFO: child pid is 0 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:176: TINFO: go loop, current pid is 4523 > > > external/ltp/testcases/kernel/sched/cfs-scheduler/starvation.c:145: TINFO: current ppid is 4523, current pid is 4524, go to child() start > > > > main pid is 4523, child pid is 4524, and we only see child pid is working (checking by top) > > > > 4524 root 20 0 14M 472K 0 R 85.7 0.0 0:14.93 starvation_v4 -t 1000000 -l 1000000 <-- cpu_load by top > > > So this looks like we managed to reproduce the issue the test was trying > > to catch. The child is hogging the CPU and the parent process cannot > > proceed. And I suppose that this happens only on 32bit because 32bit is > > less tested these days. > > I guess we can merge this, right? > Or we still not sure whether this is really kernel bug not related to the > change? It stil needs a runtime check at the end of the loop in a case that timeout is multiplied. I will have to send another version, thanks for reminding me. -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp