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Wed, 21 Oct 2026 07:16:40 -0700 (PDT) Received: from fedora ([2.35.202.135]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1fb698cebsm117409555e9.1.2026.10.21.07.16.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 07:16:39 -0700 (PDT) From: Francesco Nigro To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org Cc: mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, james.clark@linaro.org, kan.liang@linux.intel.com, leo.yan@arm.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, Francesco Nigro Subject: Re: [PATCH] perf test: Add test for events re-armed with PERF_EVENT_IOC_REFRESH Date: Wed, 21 Oct 2026 16:16:30 +0200 Message-ID: <20261021141630.2408518-1-nigro.fra@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: References: X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > On systems with Transparent Huge Pages (THP) or multi-size THP (mTHP) set > to "always" [...] As a result, overflows only reaches 489 (or fewer) > instead of NR_EVENTS (1000), and count_overflows() returns TEST_FAIL. Confirmed: on master with transparent_hugepage=always the software case gets 489 of 1000 overflows. With madvise(MADV_NOHUGEPAGE) on the buffer it gets all 1000, and the tracepoint case still gets 1. I'll send a v2 with that change. Thanks, Francesco