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Tue, 6 Apr 2021 13:34:22 +0000 (UTC) Received: from krava (unknown [10.40.195.36]) by smtp.corp.redhat.com (Postfix) with SMTP id EB56D6EF42; Tue, 6 Apr 2021 13:34:17 +0000 (UTC) Date: Tue, 6 Apr 2021 15:34:16 +0200 From: Jiri Olsa To: John Garry Cc: will@kernel.org, mathieu.poirier@linaro.org, leo.yan@linaro.org, peterz@infradead.org, mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, namhyung@kernel.org, irogers@google.com, linuxarm@huawei.com, kjain@linux.ibm.com, kan.liang@linux.intel.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, zhangshaokun@hisilicon.com, pc@us.ibm.com Subject: Re: [PATCH v2 2/6] perf test: Handle metric reuse in pmu-events parsing test Message-ID: References: <1616668398-144648-1-git-send-email-john.garry@huawei.com> <1616668398-144648-3-git-send-email-john.garry@huawei.com> <49025439-f9e3-0d32-b0a3-ff9f9ff71835@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <49025439-f9e3-0d32-b0a3-ff9f9ff71835@huawei.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210406_143431_327090_99323119 X-CRM114-Status: GOOD ( 28.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 06, 2021 at 02:21:11PM +0100, John Garry wrote: > On 06/04/2021 13:55, Jiri Olsa wrote: > > > > > So expr__find_other() may add a new item to pctx->ids, and we always iterate > > > > > again, and try to lookup any pmu_events, *, above. If none exist, then we > > > > hm, I don't see that.. so, what you do is: > > > > > > > > hashmap__for_each_entry_safe((&pctx->ids) ....) { > > > > > > > > rc = expr__find_other(pe->metric_expr, NULL, pctx, 0); > > > > } > > > > > > > > and what I think we need to do is: > > > > > > > > hashmap__for_each_entry_safe((&pctx->ids) ....) { > > > > > > > > rc = expr__find_other(pe->metric_expr, NULL, pctx, 0); > > > > > > > > break; > > > > } > > > > > > > > each time you resolve another metric, you need to restart > > > > the pctx->ids iteration, because there will be new items, > > > > and we are in the middle of it > > > Sure, but we will restart anyway. > > hum, where? you call expr__find_other and continue to next > > pctx->ids item > > We have: > > resolve_metric_simple() > { > bool all; > > do { > all = true; > > hashmap__for_each_entry_safe(&pctx->ids, ...) { > > pe = metricgroup_find_metric(cur->key, map); > if (!pe) > continue; > > ... > all = false; > > expr_del_id(pctx, cur->key); > > ... > rc = expr__find_other(pe->metric_expr, pctx); > if (rc) > goto out_err; > } > > } while (!all); > > } > > So once we evaluate a pmu_event in pctx->ids in @pe, @all is set false, and > we would loop again in the do-while loop, regardless of what > expr__find_other() does (apart from erroring), and so call > hashmap__for_each_entry_safe(&pctx->ids, ) again. ah ok, so it finishes the hash iteration first and then restarts it.. ok, I missed that, then it's fine > > This is really what is done in __resolve_metric() - indeed, I would use that > function directly, but it looks hard to extract that from metricgroup.c . yea, it's another world ;-) it's better to keep it separated thanks, jirka > > Thanks, > John > > > > > > Regardless of this, I don't think what I am doing is safe, i.e. adding new > > > items in the middle of the iter, so I will change in the way you suggest. > > it'll always add items in the middle of the iteration > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel