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AJvYcCVG//LqgE5USdIe2HQEi0epP/v3c+SymHYACUTmVZqdSiyRvTxkGrAnWiicybu3IOpD6XXcXGrxQw==@kvack.org X-Gm-Message-State: AOJu0YzKtS3mpfUsTpDAZSPzpx3lbymJc+e0WuvQoHTWF8NKoYMM77zv 4tG4ZAKJCJ8DSeawTBEUUU/bmcOkXnZKGpxRr+UI5RfoVTOR3D5nzpt/GS+CLgMCZJunE/t7fCS Vakk5LrszXg== X-Google-Smtp-Source: AGHT+IE7Haql4kRMGhVIrFouZcnUmxPrPTorpBWL1U181AADTVynYOoCOjR/I6BHdrXJEH2hvn+bGdgYYdY0eQ== X-Received: from wmbay10.prod.google.com ([2002:a05:600c:1e0a:b0:439:8715:690e]) (user=jackmanb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:1f8f:b0:38d:b8fd:591f with SMTP id ffacd0b85a97d-38f614991e7mr3002810f8f.5.1740063830609; Thu, 20 Feb 2025 07:03:50 -0800 (PST) Date: Thu, 20 Feb 2025 15:03:18 +0000 In-Reply-To: <20250220-mm-selftests-v1-0-9bbf57d64463@google.com> Mime-Version: 1.0 References: <20250220-mm-selftests-v1-0-9bbf57d64463@google.com> X-Mailer: b4 0.15-dev Message-ID: <20250220-mm-selftests-v1-6-9bbf57d64463@google.com> Subject: [PATCH 6/6] selftests/mm: Don't fail uffd-stress if too many CPUs From: Brendan Jackman To: Lorenzo Stoakes , Andrew Morton , Shuah Khan Cc: Mateusz Guzik , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Brendan Jackman X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1C7294000D X-Stat-Signature: bs4ngf1cdogg45sgpq9mkbsda6wbn5ni X-HE-Tag: 1740063831-781591 X-HE-Meta: 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 IJBhPiu2 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.015448, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This calculation divides a fixed parameter by an environment-dependent parameter i.e. the number of CPUs. The simple way to avoid machine-specific failures here is to just put a cap on the max value of the latter. Suggested-by: Mateusz Guzik Signed-off-by: Brendan Jackman --- tools/testing/selftests/mm/uffd-stress.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index 1facfb79e09aa4113e344d7d90dec06a37264058..f306accbef255c79bc3eeba8b9e42161a88fc10e 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -453,6 +453,10 @@ int main(int argc, char **argv) } nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); + if (nr_cpus > 32) { + /* Don't let calculation below go to zero. */ + nr_cpus = 32; + } nr_pages_per_cpu = bytes / page_size / nr_cpus; if (!nr_pages_per_cpu) {