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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 062C7CA0FE7 for ; Mon, 25 Aug 2025 14:57:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 483038E0035; Mon, 25 Aug 2025 10:57:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 432278E0001; Mon, 25 Aug 2025 10:57:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 321468E0035; Mon, 25 Aug 2025 10:57:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 1E8358E0001 for ; Mon, 25 Aug 2025 10:57:56 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id D451F160423 for ; Mon, 25 Aug 2025 14:57:55 +0000 (UTC) X-FDA: 83815584510.10.01D3ECD Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) by imf25.hostedemail.com (Postfix) with ESMTP id E8B36A0010 for ; Mon, 25 Aug 2025 14:57:53 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=bytedance.com header.s=google header.b=F7Ptlajb; spf=pass (imf25.hostedemail.com: domain of linyongting@bytedance.com designates 209.85.210.171 as permitted sender) smtp.mailfrom=linyongting@bytedance.com; dmarc=pass (policy=quarantine) header.from=bytedance.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1756133874; a=rsa-sha256; cv=none; b=yzLo682D2HjiaKT25xtf04jq+GD6c6X8Q8Fxz4oslXpJf1lGHo7+GdmMuE+H/Py3hPg/cL iWWN+mDwgxHECATURrE+OdGoF/Ss/YLveFvtv2Nk4kml7xERWb8Vrbld5YJwJWUW1LENiS qBRbXiDW3dr5l3zU6wYipoXrc3BkVYM= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=bytedance.com header.s=google header.b=F7Ptlajb; spf=pass (imf25.hostedemail.com: domain of linyongting@bytedance.com designates 209.85.210.171 as permitted sender) smtp.mailfrom=linyongting@bytedance.com; dmarc=pass (policy=quarantine) header.from=bytedance.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1756133874; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=frobiiF+V7JXOVqxsCpLilnhoxfx3g4fKn8gApXFwiY=; b=E5235OHACCeRZpnOGxQThE+RyNHl3jcn9kr4AMRdP7GzACen9B6IoegHGjjx8ivFCxlYwz oK2tmntmCtF6AVvYbFoyEKQxHfuZRcK3jYvAZRm8igTC8vHNGutb/10qe+bvnRAXnwPsiN mvyDolWpvcahNu1RsjAIihzouHFosXg= Received: by mail-pf1-f171.google.com with SMTP id d2e1a72fcca58-76e6cbb991aso3869991b3a.1 for ; Mon, 25 Aug 2025 07:57:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1756133873; x=1756738673; darn=kvack.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=frobiiF+V7JXOVqxsCpLilnhoxfx3g4fKn8gApXFwiY=; b=F7Ptlajb+COcSr7B6p6Ai14FsMzNNgThyCLxxEJnXJaQiOWaqWlBIix9PF5z85HE4t mdyE/xf+mr0EwLAVrSY82KsjT/5L2xPL0uw7AmmdJZWvLZUmvu07g44DT/b5lXmStovJ bkfb8WCTOTRwfnSMKOahVZRGTkJk4N6boV27sk2LUyCHDIGKrmYY1RUkfn/ZNKg3ngcW 5g17cdpj/Ep29jePNfsV2ecwzxZJPmzToODR8rss92xKc72iRj7bhQuqyxGykIZi9z7A GFxNCFfM91yC6F+ThD9096sO6vlNeXO7wjLdG7k9gOG0fGKAIKkkpJ2G+PrsjUxYSmg7 fwVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756133873; x=1756738673; 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=frobiiF+V7JXOVqxsCpLilnhoxfx3g4fKn8gApXFwiY=; b=ek9wS7Z96+CB/Xx1LjJtVICeED8edlbcHmebMgPh3U/SB7zg3rZcFdbyx/coMlnDsI RZcauSJTz4hM3N8ObKsr0AG6zUbWKkbX+gd0P76MRGIsOuG77JI2r4fSCrCEBz/3APoL hgfnmUNtjWi9QbuJJr8x6i5/i85OwiK25FQ2qk90zBJdhExKDURXkoVp7ky+H0SuJIZj F2wU9aoaP0vftFfD+pC9HiZdD95SbynA2zVeiScfXd8SyhMaD690cFSxMQOMGt19PFt5 ToczjFI0DVzqm80DHUx4kH6WjXXpgE31rTu1iym1L31bAhg8vyMH1pEkmoy710QUHr9q YI+Q== X-Forwarded-Encrypted: i=1; AJvYcCXHwfljKWB/MD/eaPyuAt4IyjERF3U1qL3Y11/8LdrMSeS1QISpR9tSBAO7IJSSQlODXeJ5bLPTow==@kvack.org X-Gm-Message-State: AOJu0YyCr43D97eU/pfAcsbKGtqhFVGTUKBwmOdh9SVHCTD0oZRS3M4B SKCCvLUnb9MUUyKOmAdYjKgoOb5ieCsebfCXK9PBqqZPpa8E50+0WuhwpfFuZb0Tvfs= X-Gm-Gg: ASbGncvvGb8ggqq4MUh4JLFPA9IG0y2zgBWy8+KHbp6uluzkbMkc9PMrpDYt5B0c+Ny 4NhcNyful863WBAakfpzZc3Vp0VBpILSBAUT2ZYYb84NOYHsJ+P6AEFWgB+0JeTgmuw69Ubm2eg bbkrPfTg6w1tAKqTWfvOW2Ulm1av7ZQV9s0OuxKmyIXvLqJPz1D8KbgNCoPCzAweoxutiFW002K lLQr96Vmz6QAFQoicRZcKkfpzOMlA6AZY/Hu+wVKYhC4f1iPaV6Ip7EjtGq4K1ThyjDjDsuARbC ZLqMBUg/BeUPRKAQHTDLYZDzLiVz4yQb6psm0/dsQvpFpcHnEWhB9mgCddJxxYapEjZNgBz5hsV ogMhxIfvtE6Qc3LePCcXIuG5tnvthSEvz/44K5S+i8nan4jMvzPELkelGjS0CwEOnWZdEJT8= X-Google-Smtp-Source: AGHT+IFN3XgZGUydfFw4/mbd3YmT+QXstnE6CrDDlxBYxDb55CdCB22fpDRPMIk2g4/sSsJBoMDeZg== X-Received: by 2002:a05:6a20:734c:b0:240:1ad8:1821 with SMTP id adf61e73a8af0-24340b5e298mr17551742637.19.1756133872732; Mon, 25 Aug 2025 07:57:52 -0700 (PDT) Received: from H3DJ4YJ04F.bytedance.net ([203.208.189.7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-770401b190asm7803436b3a.74.2025.08.25.07.57.49 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 25 Aug 2025 07:57:52 -0700 (PDT) From: Yongting Lin To: anthony.yznaga@oracle.com, khalid@kernel.org, shuah@kernel.org, linyongting@bytedance.com Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org Subject: [PATCH 6/8] mshare: selftests: Add some helper functions for reading and controlling cgroup Date: Mon, 25 Aug 2025 22:57:09 +0800 Message-Id: <20250825145719.29455-7-linyongting@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250825145719.29455-1-linyongting@bytedance.com> References: <20250825145719.29455-1-linyongting@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: E8B36A0010 X-Stat-Signature: ic5whna3ytsi1e7ef7sor8rzdzmcaaf4 X-Rspam-User: X-HE-Tag: 1756133873-460263 X-HE-Meta: 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 6AgUhNxM frrSbawQf4UOk0d2yynprc8PJgQFmSh5Gloo3+x3ZH/X8Rq47HXADKGPJKXb7FmlFIRqQy/hL9pyMk3sSISX8KP3Ngae4vb0kNT/NJOTUj13JiiWpmPVNMnIiBF2efdSRjEKNY/tBBWDBNIrejd3fc+pk3bAKrHVJlGXHRkxsdtI3ycYs7m6ZGwuYPqjdeDuzXryBiaFZqZTl/yl8JeMgFj+Ad8ZZ/pooGzPzNVvRAN9BcixFDQ+BP74Yi5HvHI8vwsvRGOyA2s4KOU4jNfxhRYqK6LPqUGDU/SC5mhuD4Z2Xj+0yrmgH91LgHA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Before verify some complicated memory functionalities such as swap memory and THP, we need add some helper functions to controlling the cgroup (specifically, memcg). These helper functions consist: Create and destroy individual cgroup for test cases attach and dettach the test process to specified cgroup Read swap size and thp size from testing cgroup Signed-off-by: Yongting Lin --- tools/testing/selftests/mshare/util.c | 128 ++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) diff --git a/tools/testing/selftests/mshare/util.c b/tools/testing/selftests/mshare/util.c index 75f6ff25aa2c..94fddaea2c56 100644 --- a/tools/testing/selftests/mshare/util.c +++ b/tools/testing/selftests/mshare/util.c @@ -121,3 +121,131 @@ int mshare_ioctl_munmap(int fd, size_t size) return ioctl(fd, MSHAREFS_UNMAP, &munmap); } + +/* + * Helper functions for cgroup + */ + +#define CGROUP_BASE "/sys/fs/cgroup/" +#define CGROUP_TEST "mshare-test-XXXXXX" + +bool is_cgroup_v2; + +__attribute__((constructor)) +void get_cgroup_version(void) +{ + if (access(CGROUP_BASE "cgroup.controllers", F_OK) == 0) + is_cgroup_v2 = true; +} + +int create_mshare_test_cgroup(char *cgroup, size_t len) +{ + if (is_cgroup_v2) + snprintf(cgroup, len, "%s/%s", CGROUP_BASE, CGROUP_TEST); + else + snprintf(cgroup, len, "%s/memory/%s", CGROUP_BASE, CGROUP_TEST); + + char *path = mkdtemp(cgroup); + + if (!path) { + perror("mkdtemp"); + return -1; + } + + return 0; +} + +int remove_cgroup(char *cgroup) +{ + return rmdir(cgroup); +} + +int write_data_to_cgroup(char *cgroup, char *file, char *data) +{ + char filename[128]; + int fd; + int ret; + + snprintf(filename, sizeof(filename), "%s/%s", cgroup, file); + fd = open(filename, O_RDWR); + + if (fd == -1) + return -1; + + ret = write(fd, data, strlen(data)); + close(fd); + + return ret; +} + +int attach_to_cgroup(char *cgroup) +{ + char pid_str[32]; + + snprintf(pid_str, sizeof(pid_str), "%d", getpid()); + return write_data_to_cgroup(cgroup, "cgroup.procs", pid_str); +} + +/* + * Simplely, just move the pid to root memcg as avoid + * complicated consideration. + */ +int dettach_from_cgroup(char *cgroup) +{ + char pid_str[32]; + char *root_memcg; + + if (is_cgroup_v2) + root_memcg = CGROUP_BASE; + else + root_memcg = CGROUP_BASE "memory"; + + snprintf(pid_str, sizeof(pid_str), "%d", getpid()); + return write_data_to_cgroup(root_memcg, "cgroup.procs", pid_str); +} + +size_t read_data_from_cgroup(char *cgroup, char *file, char *field) +{ + char filename[128]; + FILE *fp; + char line[80]; + size_t size = -1; + + snprintf(filename, sizeof(filename), "%s/%s", cgroup, file); + fp = fopen(filename, "r"); + if (!fp) { + perror("fopen"); + return -1; + } + + while (fgets(line, sizeof(line), fp)) { + if (!strncmp(line, field, strlen(field))) { + char *value = line + strlen(field) + 1; + + size = atol(value); + break; + } + } + + fclose(fp); + + return size; +} + +size_t read_swap_from_cgroup(char *cgroup) +{ + if (is_cgroup_v2) + return read_data_from_cgroup(cgroup, "memory.stat", "pswpout"); + else + return read_data_from_cgroup(cgroup, "memory.stat", "swap"); +} + +size_t read_huge_from_cgroup(char *cgroup) +{ + if (is_cgroup_v2) + return read_data_from_cgroup(cgroup, "memory.stat", "file_thp") + + read_data_from_cgroup(cgroup, "memory.stat", "anon_thp") + + read_data_from_cgroup(cgroup, "memory.stat", "shmem_thp"); + else + return read_data_from_cgroup(cgroup, "memory.stat", "rss_huge"); +} -- 2.20.1