From: kbuild test robot <lkp@intel.com>
To: linxiulei@gmail.com
Cc: kbuild-all@01.org, peterz@infradead.org, jolsa@redhat.com,
mingo@redhat.com, acme@kernel.org,
alexander.shishkin@linux.intel.com, linux-kernel@vger.kernel.org,
tglx@linutronix.de, eranian@gmail.com,
torvalds@linux-foundation.org, linux-perf-users@vger.kernel.org,
brendan.d.gregg@gmail.com, yang_oliver@hotmail.com,
jinli.zjl@alibaba-inc.com,
"leilei.lin" <leilei.lin@alibaba-inc.com>
Subject: Re: [PATCH RESEND] perf/core: Fix installing cgroup event into cpu
Date: Fri, 26 Jan 2018 10:02:34 +0800 [thread overview]
Message-ID: <201801260922.ZejWKyP8%fengguang.wu@intel.com> (raw)
In-Reply-To: <20180123041306.15431-1-linxiulei@gmail.com>
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Hi leilei.lin,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.15-rc9 next-20180119]
[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/linxiulei-gmail-com/perf-core-Fix-installing-cgroup-event-into-cpu/20180126-083327
config: x86_64-randconfig-g0-01260853 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
kernel//events/core.c: In function '__perf_install_in_context':
kernel//events/core.c:2315:11: error: 'struct perf_event' has no member named 'cgrp'
if (event->cgrp) {
^
>> kernel//events/core.c:2322:3: error: implicit declaration of function 'perf_cgroup_from_task' [-Werror=implicit-function-declaration]
cgrp = perf_cgroup_from_task(current, ctx);
^
kernel//events/core.c:2322:8: warning: assignment makes pointer from integer without a cast
cgrp = perf_cgroup_from_task(current, ctx);
^
>> kernel//events/core.c:2323:33: error: dereferencing pointer to incomplete type
if (!cgroup_is_descendant(cgrp->css.cgroup,
^
kernel//events/core.c:2324:11: error: 'struct perf_event' has no member named 'cgrp'
event->cgrp->css.cgroup))
^
cc1: some warnings being treated as errors
vim +/perf_cgroup_from_task +2322 kernel//events/core.c
2274
2275 /*
2276 * Cross CPU call to install and enable a performance event
2277 *
2278 * Very similar to remote_function() + event_function() but cannot assume that
2279 * things like ctx->is_active and cpuctx->task_ctx are set.
2280 */
2281 static int __perf_install_in_context(void *info)
2282 {
2283 struct perf_event *event = info;
2284 struct perf_event_context *ctx = event->ctx;
2285 struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
2286 struct perf_event_context *task_ctx = cpuctx->task_ctx;
2287 struct perf_cgroup *cgrp;
2288 bool reprogram = true;
2289 int ret = 0;
2290
2291 raw_spin_lock(&cpuctx->ctx.lock);
2292 if (ctx->task) {
2293 raw_spin_lock(&ctx->lock);
2294 task_ctx = ctx;
2295
2296 reprogram = (ctx->task == current);
2297
2298 /*
2299 * If the task is running, it must be running on this CPU,
2300 * otherwise we cannot reprogram things.
2301 *
2302 * If its not running, we don't care, ctx->lock will
2303 * serialize against it becoming runnable.
2304 */
2305 if (task_curr(ctx->task) && !reprogram) {
2306 ret = -ESRCH;
2307 goto unlock;
2308 }
2309
2310 WARN_ON_ONCE(reprogram && cpuctx->task_ctx && cpuctx->task_ctx != ctx);
2311 } else if (task_ctx) {
2312 raw_spin_lock(&task_ctx->lock);
2313 }
2314
> 2315 if (event->cgrp) {
2316 /*
2317 * Only care about cgroup events.
2318 *
2319 * If only the task belongs to cgroup of this event,
2320 * we will continue the installment
2321 */
> 2322 cgrp = perf_cgroup_from_task(current, ctx);
> 2323 if (!cgroup_is_descendant(cgrp->css.cgroup,
2324 event->cgrp->css.cgroup))
2325 goto unlock;
2326 }
2327
2328 if (reprogram) {
2329 ctx_sched_out(ctx, cpuctx, EVENT_TIME);
2330 add_event_to_ctx(event, ctx);
2331 ctx_resched(cpuctx, task_ctx, get_event_type(event));
2332 } else {
2333 add_event_to_ctx(event, ctx);
2334 }
2335
2336 unlock:
2337 perf_ctx_unlock(cpuctx, task_ctx);
2338
2339 return ret;
2340 }
2341
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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next prev parent reply other threads:[~2018-01-26 2:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 4:13 [PATCH RESEND] perf/core: Fix installing cgroup event into cpu linxiulei
2018-01-23 16:37 ` Peter Zijlstra
2018-01-24 7:29 ` Lin Xiulei
2018-01-26 2:02 ` kbuild test robot [this message]
2018-01-29 3:37 ` Lin Xiulei
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