From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ve0-f171.google.com (mail-ve0-f171.google.com [209.85.128.171]) by kanga.kvack.org (Postfix) with ESMTP id 38A726B0031 for ; Tue, 1 Jul 2014 09:02:07 -0400 (EDT) Received: by mail-ve0-f171.google.com with SMTP id jz11so9666323veb.30 for ; Tue, 01 Jul 2014 06:02:06 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id k1si3654711qcd.34.2014.07.01.06.02.05 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Jul 2014 06:02:06 -0700 (PDT) From: "Jerome Marchand" Subject: [PATCH 0/5] mm, shmem: Enhance per-process accounting of shared memnory Date: Tue, 1 Jul 2014 15:01:56 +0200 Message-Id: <1404219721-32241-1-git-send-email-jmarchan@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Hugh Dickins There are several shortcomings with the accounting of shared memory (sysV shm, shared anonymous mapping, mapping to a tmpfs file). The values in /proc//status and statm don't allow to distinguish between shmem memory and a shared mapping to a regular file, even though theirs implication on memory usage are quite different: at reclaim, file mapping can be dropped or write back on disk while shmem needs a place in swap. As for shmem pages that are swapped-out or in swap cache, they aren't accounted at all. This series addresses these issues by adding new fields to status and smaps file in /proc//. The accounting of resident shared memory is made in the same way as it's currently done for resident memory and general swap (a counter in mm_rss_stat), but this approach proved impractical for paged-out shared memory (it would requires a rmap walk each time a page is paged-in). /proc//smaps also lacks proper accounting of shared memory since shmem subsystem hides all implementation detail to generic mm code. This series adds the shmem_locate() function that returns the location of a particular page (resident, in swap or swap cache). Called from smaps code, it allows to show more detailled accounting of shmem mappings in smaps. Patch 1 adds a counter to keep track of resident shmem memory. Patch 2 adds a function to allow generic code to know the physical location of a shmem page. Patch 3 adds simple helper function. Patch 4 accounts swapped-out shmem in /proc//status. Patch 5 adds shmem specific fields to /proc//smaps. Thanks, Jerome Jerome Marchand (5): mm, shmem: Add shmem resident memory accounting mm, shmem: add shmem_locate function mm, shmem: add shmem_vma() helper mm, shmem: Add shmem swap memory accounting mm, shmem: show location of non-resident shmem pages in smaps Documentation/filesystems/proc.txt | 15 ++++ arch/s390/mm/pgtable.c | 2 +- fs/proc/task_mmu.c | 139 +++++++++++++++++++++++++++++++++++-- include/linux/mm.h | 20 ++++++ include/linux/mm_types.h | 7 +- kernel/events/uprobes.c | 2 +- mm/filemap_xip.c | 2 +- mm/memory.c | 37 ++++++++-- mm/rmap.c | 8 +-- mm/shmem.c | 37 ++++++++++ 10 files changed, 249 insertions(+), 20 deletions(-) -- 1.9.3 -- 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