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Tue, 11 Jun 2024 11:01:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1718103674; bh=vBH/6OYdVjsNNyjp2pikvMXvKQezYlNPmAqHiQSiZF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Foktfj8QEBkhkirvVOBKEf6XICDJq6ObR9pscnonkImbxnlWTGr+tmP5foto8XmEs JoieWu/Q+B5NF5ppUo3rK96S6DYaVxtt8zdpgPWcXb9MNP8J9Y6/imP934OE7VMnNc Rke55cMw9xbBNa0vw5kM/EP0l+vlE3ax5ezQ+Pg827CfLwaSeWk2qSXGPeiLibAZbe DHyZrsCQOX/GqneNFqoU46MnMxtUEjFcwKNRr09+xmXZMu3GHEcXqTA7vnJ/90mQ+e 0aQadq0REIZuepZIkD46DlaV2S/RRDewk1IE9M91fzJQa2ADAjjk2ifEm7ejw2KCA6 tH1SJ1l6Wg27w== From: Andrii Nakryiko To: linux-fsdevel@vger.kernel.org, brauner@kernel.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, gregkh@linuxfoundation.org, linux-mm@kvack.org, liam.howlett@oracle.com, surenb@google.com, rppt@kernel.org, Andrii Nakryiko Subject: [PATCH v4 4/7] docs/procfs: call out ioctl()-based PROCMAP_QUERY command existence Date: Tue, 11 Jun 2024 04:00:52 -0700 Message-ID: <20240611110058.3444968-5-andrii@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240611110058.3444968-1-andrii@kernel.org> References: <20240611110058.3444968-1-andrii@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 1AC1880002 X-Rspam-User: X-Rspamd-Server: rspam12 X-Stat-Signature: rqpbxmaj49ai9bn7ca9ugz8b7s48hoqy X-HE-Tag: 1718103674-317927 X-HE-Meta: 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 WbAakEQJ svDVXeuEqwGzjgbbFSjthiGT3F0dZSW3YgST5xVhfvUA+yAC1kej92deshhBEQbqMx5ci5n0jVcXlpvzGd7fBNG/UtcNjAIhWjhtH+LuQMmqNyXL8FUwsXmhM/xi+AsxNjwJCFT/2tsl30/7w94VvLKE2lkTetC0/U6eTT9o2UWvcziwaF4LrdIjmXkcvi3T98wizf29J9WQfWioR0VVWCtVHKydHIl1wBGq4e9PGp1CQHVyUiuVhzZl24jXK4hN+cNX8YUn3TFC5ImcPQ8JM07fM4ab7luIZA2ar 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: Call out PROCMAP_QUERY ioctl() existence in the section describing /proc/PID/maps file in documentation. We refer user to UAPI header for low-level details of this programmatic interface. Signed-off-by: Andrii Nakryiko --- Documentation/filesystems/proc.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 7c3a565ffbef..3a86d12c881f 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -443,6 +443,15 @@ is not associated with a file: or if empty, the mapping is anonymous. +Starting with 6.11 kernel, /proc/PID/maps provides an alternative +ioctl()-based API that gives ability to flexibly and efficiently query and +filter individual VMAs. This interface is binary and is meant for more +efficient and easy programmatic use. `struct procmap_query`, defined in +linux/fs.h UAPI header, serves as an input/output argument to the +`PROCMAP_QUERY` ioctl() command. See comments in linus/fs.h UAPI header for +details on query semantics, supported flags, data returned, and general API +usage information. + The /proc/PID/smaps is an extension based on maps, showing the memory consumption for each of the process's mappings. For each mapping (aka Virtual Memory Area, or VMA) there is a series of lines such as the following::