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Fri, 12 Mar 2021 18:29:45 +0000 (UTC) Received: from krava (unknown [10.40.192.54]) by smtp.corp.redhat.com (Postfix) with SMTP id 918C65D6BA; Fri, 12 Mar 2021 18:29:41 +0000 (UTC) Date: Fri, 12 Mar 2021 19:29:40 +0100 From: Jiri Olsa To: Rob Herring Cc: Will Deacon , Catalin Marinas , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Ian Rogers , Alexander Shishkin , Honnappa Nagarahalli , Zachary.Leaf@arm.com, Raphael Gault , Jonathan Cameron , Namhyung Kim , Itaru Kitayama , linux-arm-kernel , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v6 04/10] libperf: Add evsel mmap support Message-ID: References: <20210311000837.3630499-1-robh@kernel.org> <20210311000837.3630499-5-robh@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210312_182952_648125_B8C3E8C4 X-CRM114-Status: GOOD ( 24.50 ) 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 Fri, Mar 12, 2021 at 07:34:39AM -0700, Rob Herring wrote: > On Fri, Mar 12, 2021 at 6:59 AM Jiri Olsa wrote: > > > > On Wed, Mar 10, 2021 at 05:08:31PM -0700, Rob Herring wrote: > > > > SNIP > > > > > + > > > static int > > > sys_perf_event_open(struct perf_event_attr *attr, > > > pid_t pid, int cpu, int group_fd, > > > @@ -137,6 +147,8 @@ void perf_evsel__free_fd(struct perf_evsel *evsel) > > > { > > > xyarray__delete(evsel->fd); > > > evsel->fd = NULL; > > > + xyarray__delete(evsel->mmap); > > > + evsel->mmap = NULL; > > > } > > > > > > void perf_evsel__close(struct perf_evsel *evsel) > > > @@ -156,6 +168,45 @@ void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu) > > > perf_evsel__close_fd_cpu(evsel, cpu); > > > } > > > > > > +int perf_evsel__mmap(struct perf_evsel *evsel, int pages) > > > +{ > > > + int ret, cpu, thread; > > > + struct perf_mmap_param mp = { > > > + .prot = PROT_READ | PROT_WRITE, > > > + .mask = (pages * page_size) - 1, > > > + }; > > > > I don't mind using evsel->fd for dimensions below, > > but we need to check in here that it's defined, > > that perf_evsel__open was called > > Right, so I'll add this here: > > if (evsel->fd == NULL) > return -EINVAL; > > Note that struct evsel has dimensions in it, but they are only set in > the evlist code. I couldn't tell if that was by design or mistake. we do? we have the cpus and threads in perf_evsel no? also you'd need perf_evsel not evsel, right? > > BTW, I just noticed perf_evsel__open is leaking memory on most of its > error paths. nice.. let's fix it ;-) thanks, jirka > > > > > jirka > > > > > + > > > + if (evsel->mmap == NULL && > > > + perf_evsel__alloc_mmap(evsel, xyarray__max_x(evsel->fd), xyarray__max_y(evsel->fd)) < 0) > > > + return -ENOMEM; > > > + > > > + for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) { > > > + for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) { > > > + int fd = FD(evsel, cpu, thread); > > > + struct perf_mmap *map = MMAP(evsel, cpu, thread); > > > + > > > + if (fd < 0) > > > + continue; > > > + > > > + perf_mmap__init(map, NULL, false, NULL); > > > + > > > + ret = perf_mmap__mmap(map, &mp, fd, cpu); > > > + if (ret) > > > + return -1; > > > + } > > > + } > > > + > > > + return 0; > > > +} > > > + > > > > SNIP > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel