From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f171.google.com (mail-qk0-f171.google.com [209.85.220.171]) by kanga.kvack.org (Postfix) with ESMTP id 68C076B0258 for ; Sat, 5 Dec 2015 06:09:07 -0500 (EST) Received: by qkeg192 with SMTP id g192so8589537qke.1 for ; Sat, 05 Dec 2015 03:09:07 -0800 (PST) Received: from mx5-phx2.redhat.com (mx5-phx2.redhat.com. [209.132.183.37]) by mx.google.com with ESMTPS id 97si9846888qkt.81.2015.12.05.03.09.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 05 Dec 2015 03:09:06 -0800 (PST) Date: Sat, 5 Dec 2015 06:09:05 -0500 (EST) From: Rodrigo Freire Message-ID: <1518369124.22714085.1449313745139.JavaMail.zimbra@redhat.com> In-Reply-To: <1281769343.11551980.1447959500824.JavaMail.zimbra@redhat.com> Subject: [PATCH RESEND] Documentation: Describe the shared memory usage/accounting MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel Cc: linux-mm@kvack.org The Shared Memory accounting support is present in Kernel since commit 4b02108ac1b3 ("mm: oom analysis: add shmem vmstat") and in userland free(1) since 2014. This patch updates the Documentation to reflect this change. Signed-off-by: Rodrigo Freire --- --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -842,6 +842,7 @@ Writeback: 0 kB AnonPages: 861800 kB Mapped: 280372 kB +Shmem: 644 kB Slab: 284364 kB SReclaimable: 159856 kB SUnreclaim: 124508 kB @@ -898,6 +899,7 @@ AnonPages: Non-file backed pages mapped into userspace page tables AnonHugePages: Non-file backed huge pages mapped into userspace page tables Mapped: files which have been mmaped, such as libraries + Shmem: Total memory used by shared memory (shmem) and tmpfs Slab: in-kernel data structures cache SReclaimable: Part of Slab, that might be reclaimed, such as caches SUnreclaim: Part of Slab, that cannot be reclaimed on memory pressure --- a/Documentation/filesystems/tmpfs.txt +++ b/Documentation/filesystems/tmpfs.txt @@ -17,10 +17,10 @@ cannot swap and you do not have the possibility to resize them. Since tmpfs lives completely in the page cache and on swap, all tmpfs -pages currently in memory will show up as cached. It will not show up -as shared or something like that. Further on you can check the actual -RAM+swap use of a tmpfs instance with df(1) and du(1). - +pages will be shown in /proc/meminfo as "Shmem" and "Shared" in +free(1). Notice that shared memory pages (see ipcs(1)) will be also +counted as shared memory. The most reliable way to get the count is +using df(1) and du(1). tmpfs has the following uses: --- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org