From: Ian Rogers Date: Sat, 27 May 2023 07:21:51 +0000 (-0700) Subject: perf pmu: Remove perf_pmu__hybrid_mounted X-Git-Tag: v6.6.17~4410^2~216 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4ced2c246e2c9c90a7ea96f4bcd31a0b696b8dd6;p=platform%2Fkernel%2Flinux-rpi.git perf pmu: Remove perf_pmu__hybrid_mounted perf_pmu__hybrid_mounted is used to detect whether cpu_core or cpu_atom is mounted with a non-empty cpus file by pmu_lookup. Discussion [1] showed the empty cpus file check to be redundant and so pmu_lookup needn't have a call to perf_pmu__hybrid_mounted. Checking hybrid_mounted in pmu_is_uncore is redundant as the next cpumask read will fail returning false. Reduce the scope of perf_pmu__find_hybrid_pmu by making it static. [1] https://lore.kernel.org/lkml/20230524221831.1741381-17-irogers@google.com/ Reviewed-by: Kan Liang Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ali Saidi Cc: Athira Rajeev Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Huacai Chen Cc: Ingo Molnar Cc: James Clark Cc: Jing Zhang Cc: Jiri Olsa Cc: John Garry Cc: Kajol Jain Cc: Kang Minchul Cc: Leo Yan Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Mike Leach Cc: Ming Wang Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Rob Herring Cc: Sandipan Das Cc: Sean Christopherson Cc: Suzuki Poulouse Cc: Thomas Richter Cc: Will Deacon Cc: Xing Zhengjun Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230527072210.2900565-16-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/pmu-hybrid.c b/tools/perf/util/pmu-hybrid.c index bc4cb07..7fe943d 100644 --- a/tools/perf/util/pmu-hybrid.c +++ b/tools/perf/util/pmu-hybrid.c @@ -18,20 +18,7 @@ LIST_HEAD(perf_pmu__hybrid_pmus); -bool perf_pmu__hybrid_mounted(const char *name) -{ - int cpu; - char pmu_name[PATH_MAX]; - struct perf_pmu pmu = {.name = pmu_name}; - - if (strncmp(name, "cpu_", 4)) - return false; - - strlcpy(pmu_name, name, sizeof(pmu_name)); - return perf_pmu__scan_file(&pmu, "cpus", "%u", &cpu) > 0; -} - -struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name) +static struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name) { struct perf_pmu *pmu; diff --git a/tools/perf/util/pmu-hybrid.h b/tools/perf/util/pmu-hybrid.h index 206b949..8dbcae9 100644 --- a/tools/perf/util/pmu-hybrid.h +++ b/tools/perf/util/pmu-hybrid.h @@ -13,9 +13,6 @@ extern struct list_head perf_pmu__hybrid_pmus; #define perf_pmu__for_each_hybrid_pmu(pmu) \ list_for_each_entry(pmu, &perf_pmu__hybrid_pmus, hybrid_list) -bool perf_pmu__hybrid_mounted(const char *name); - -struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name); bool perf_pmu__is_hybrid(const char *name); static inline int perf_pmu__hybrid_pmu_num(void) diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index cd94abe..83c7eeb 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -617,9 +617,6 @@ static bool pmu_is_uncore(int dirfd, const char *name) { int fd; - if (perf_pmu__hybrid_mounted(name)) - return false; - fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH); if (fd < 0) return false; @@ -907,16 +904,9 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name) LIST_HEAD(aliases); __u32 type; char *name = pmu_find_real_name(lookup_name); - bool is_hybrid = perf_pmu__hybrid_mounted(name); char *alias_name; /* - * Check pmu name for hybrid and the pmu may be invalid in sysfs - */ - if (!strncmp(name, "cpu_", 4) && !is_hybrid) - return NULL; - - /* * The pmu data we store & need consists of the pmu * type value and format definitions. Load both right * now. @@ -936,7 +926,6 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name) pmu->cpus = pmu_cpumask(dirfd, name); pmu->name = strdup(name); - if (!pmu->name) goto err; @@ -967,7 +956,7 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name) list_splice(&aliases, &pmu->aliases); list_add_tail(&pmu->list, &pmus); - if (is_hybrid) + if (!strcmp(name, "cpu_core") || !strcmp(name, "cpu_atom")) list_add_tail(&pmu->hybrid_list, &perf_pmu__hybrid_pmus); else INIT_LIST_HEAD(&pmu->hybrid_list);