From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BE54BCCF9F8 for ; Mon, 3 Nov 2025 10:52:55 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vFsAu-0001fj-6d; Mon, 03 Nov 2025 05:52:36 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vFsAs-0001fM-6c for qemu-devel@nongnu.org; Mon, 03 Nov 2025 05:52:34 -0500 Received: from mail-wr1-x435.google.com ([2a00:1450:4864:20::435]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1vFsAn-0002Vn-7f for qemu-devel@nongnu.org; Mon, 03 Nov 2025 05:52:33 -0500 Received: by mail-wr1-x435.google.com with SMTP id ffacd0b85a97d-429c48e05aeso1355119f8f.1 for ; Mon, 03 Nov 2025 02:52:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1762167143; x=1762771943; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=gu1x2Jvo2cxOYeIuXySnlCfrmNhzmsl8WxpirL+tZl8=; b=Av+jWS6jcQJtLLI+RB9SwMdA4yAsJQiWRPgYXkAVF4DdC8VoEgOOrGfxYr6Ru3tiAD hd5vGKDVDDaFTMPNglu9zY7ADndN1/m8kPqbP2PffzwKiZKuF+KmVUtZmYUsRAdtoFs/ dKKiuJ+q+CpsLqZ6fhwWajOmFAYN8dzb6NQzsClabQLoiGCkz+TTqT+A+R0ylswhVRDJ fzbo+U5uKRprsMjKIn8VFJQMeHMFhKzrPvRL6qqDyl3hQh/5AXeMdtOFJstNvG/DmWtv QylzozbwF5Z9GuAjzbSZlr186WGpZc96/XuIV/GUD44k3Tb3zRVtelm79VPyIwv7vNW9 0EBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762167143; x=1762771943; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gu1x2Jvo2cxOYeIuXySnlCfrmNhzmsl8WxpirL+tZl8=; b=NnoPO+EogFz+CKbTLWGRmaaKLTuiFK1mSgKRokWWQ7ckTYFWERzeHC8gzESL5bL8zj PMUZDEjYBU9IK+ZHnwIHeAWjJQdieceIzHP96WbpZA+v8gaUzwz9SSzQcNDfFKzI17CI I43EhhHUFe2mDsRqMywLkX0cndLbkv3hREGKiK26c5K176l0qnMJEBQqJv9qN5blEVcO vFHkhgJmiHf3LapwTMLByz7cP7qWtiCcwbnnFiORG71RVJqdXr/p+26fQnucpUpELf6L sGkv7fAzS/QEy5X9pKBfxRx1kM4oyfqnNte6/scgle+HRoBL3Ln9dnJBJ1hwNdImUSxK 6+MQ== X-Gm-Message-State: AOJu0YzmMR0hk7pioQioFeg7Uj5pCwtIKc5nnOwPnM2lmx3dkdSOaYES PDVrCLLeqRaZ8wh+AkQfNCRqLAls0f5XYkN7QPgZwoYrY/kWB9xpW0V73MibRkCU1vcgjSL9WvH gaBOUzyX76nlO X-Gm-Gg: ASbGncv4l05onyWzR8sp1v3UhjBU5o3bKiOML0QcuWCpyh6wIt6RUoT1DLaZ8KVylML uquW9S574vrfcyQQxyn8/8waqwaoCyS6G5aXLv90fAM9SZ3pnz1EmeAnxTAmWdkm4TIFZLDutBG czsBiQ6vy72PvtxfXkD7ekSAw/NNokrFHGYWmWfxyQY9vRcAFO4z66rmLtN6T65W54/dpDKGHSa wzevZWZTHaw3olhWuUpU9cUMs6o2WSs3qb1anJXgGVWiqf5KY4Haekik3hEqT5FQwvDnwPUSP4E QiV4sf7NF2fZTTvmLREy6qRYOmzH2adTDFiBFomDnM9fdTqDLZmEkLtwE0z02IotuQc+ZKRhr8T jirVVTen7Vtuf3ZWqnYC8LwquW4JEWWdxOM2kUuVdqGgWwUKWGebNOWobQuG2n16POb9m0NoxG9 KZ02aV/XvSCG0jQT05uTmR9iaM1EIiwZmcUmE8r/yEbyvZUeEA3T+ZjwuBH2KOC4DJ8/K3EQ== X-Google-Smtp-Source: AGHT+IGnFhlkhUanAo8VERPEGec32NWhEKhShTS7RpNGOJHeZ6Er/vmAAuaOykCNOOtmUnTso766JA== X-Received: by 2002:a5d:5d85:0:b0:429:bb77:5deb with SMTP id ffacd0b85a97d-429bb775fa9mr12350902f8f.31.1762167142789; Mon, 03 Nov 2025 02:52:22 -0800 (PST) Received: from localhost.localdomain (ip-185-104-138-122.ptr.icomera.net. [185.104.138.122]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4773c48daa0sm151530555e9.3.2025.11.03.02.52.18 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 03 Nov 2025 02:52:22 -0800 (PST) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Richard Henderson , Pierrick Bouvier , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH 2/2] osdep: Cache getpagesize() call in qemu_real_host_page_size() Date: Mon, 3 Nov 2025 11:51:10 +0100 Message-ID: <20251103105111.68294-3-philmd@linaro.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251103105111.68294-1-philmd@linaro.org> References: <20251103105111.68294-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::435; envelope-from=philmd@linaro.org; helo=mail-wr1-x435.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Since we can not know whether a libc implementation of getpagesize() calls syscalls -- potentially slow --, but we know the host page size won't change during runtime, we can cache its value. Reported-by: Richard Henderson Signed-off-by: Philippe Mathieu-Daudé --- util/osdep.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/util/osdep.c b/util/osdep.c index 44fad13dcc7..9b50d00dbda 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -616,5 +616,11 @@ int qemu_fdatasync(int fd) uintptr_t qemu_real_host_page_size(void) { - return getpagesize(); + static uintptr_t real_host_page_size; + + if (!real_host_page_size) { + real_host_page_size = getpagesize(); + } + + return real_host_page_size; } -- 2.51.0