From: kbuild test robot <lkp@intel.com>
To: Rohit Jain <rohit.k.jain@oracle.com>
Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org,
eas-dev@lists.linaro.org, peterz@infradead.org, mingo@redhat.com,
joelaf@google.com
Subject: Re: [PATCH 1/2] sched: Introduce new flags to sched_setaffinity to support soft affinity.
Date: Thu, 21 Sep 2017 18:38:19 +0800 [thread overview]
Message-ID: <201709211812.jEuJhbME%fengguang.wu@intel.com> (raw)
In-Reply-To: <1505860632-11275-2-git-send-email-rohit.k.jain@oracle.com>
Hi Rohit,
[auto build test WARNING on tip/sched/core]
[also build test WARNING on v4.14-rc1 next-20170921]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Rohit-Jain/sched-Introduce-new-flags-to-sched_setaffinity-to-support-soft-affinity/20170921-140313
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
vim +299 kernel/trace/trace_hwlat.c
0330f7aa Steven Rostedt (Red Hat 2016-07-15 269)
f447c196 Steven Rostedt (VMware 2017-01-31 270) static void move_to_next_cpu(void)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 271) {
f447c196 Steven Rostedt (VMware 2017-01-31 272) struct cpumask *current_mask = &save_cpumask;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 273) int next_cpu;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 274)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 275) if (disable_migrate)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 276) return;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 277) /*
0330f7aa Steven Rostedt (Red Hat 2016-07-15 278) * If for some reason the user modifies the CPU affinity
0330f7aa Steven Rostedt (Red Hat 2016-07-15 279) * of this thread, than stop migrating for the duration
0330f7aa Steven Rostedt (Red Hat 2016-07-15 280) * of the current test.
0330f7aa Steven Rostedt (Red Hat 2016-07-15 281) */
0330f7aa Steven Rostedt (Red Hat 2016-07-15 282) if (!cpumask_equal(current_mask, ¤t->cpus_allowed))
0330f7aa Steven Rostedt (Red Hat 2016-07-15 283) goto disable;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 284)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 285) get_online_cpus();
0330f7aa Steven Rostedt (Red Hat 2016-07-15 286) cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 287) next_cpu = cpumask_next(smp_processor_id(), current_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 288) put_online_cpus();
0330f7aa Steven Rostedt (Red Hat 2016-07-15 289)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 290) if (next_cpu >= nr_cpu_ids)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 291) next_cpu = cpumask_first(current_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 292)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 293) if (next_cpu >= nr_cpu_ids) /* Shouldn't happen! */
0330f7aa Steven Rostedt (Red Hat 2016-07-15 294) goto disable;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 295)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 296) cpumask_clear(current_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 297) cpumask_set_cpu(next_cpu, current_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 298)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 @299) sched_setaffinity(0, current_mask);
0330f7aa Steven Rostedt (Red Hat 2016-07-15 300) return;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 301)
0330f7aa Steven Rostedt (Red Hat 2016-07-15 302) disable:
0330f7aa Steven Rostedt (Red Hat 2016-07-15 303) disable_migrate = true;
0330f7aa Steven Rostedt (Red Hat 2016-07-15 304) }
0330f7aa Steven Rostedt (Red Hat 2016-07-15 305)
:::::: The code at line 299 was first introduced by commit
:::::: 0330f7aa8ee63d0c435c0cb4e47ea06235ee4b7f tracing: Have hwlat trace migrate across tracing_cpumask CPUs
:::::: TO: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
:::::: CC: Steven Rostedt <rostedt@goodmis.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
next prev parent reply other threads:[~2017-09-21 10:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 22:37 [RFC PATCH 0/2] sched: Introduce CPU soft affinity for processes Rohit Jain
2017-09-19 22:37 ` [PATCH 1/2] sched: Introduce new flags to sched_setaffinity to support soft affinity Rohit Jain
2017-09-21 6:34 ` kbuild test robot
2017-09-21 10:38 ` kbuild test robot [this message]
2017-09-19 22:37 ` [PATCH 2/2] sched: Actual changes after adding SCHED_SOFT_AFFINITY to make it work with the scheduler Rohit Jain
2017-09-21 11:52 ` Peter Zijlstra
2017-09-21 17:30 ` Rohit Jain
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