• Balbir Singh's avatar
    Memory controller: memory accounting · 8a9f3ccd
    Balbir Singh authored
    Add the accounting hooks.  The accounting is carried out for RSS and Page
    Cache (unmapped) pages.  There is now a common limit and accounting for both.
    The RSS accounting is accounted at page_add_*_rmap() and page_remove_rmap()
    time.  Page cache is accounted at add_to_page_cache(),
    __delete_from_page_cache().  Swap cache is also accounted for.
    
    Each page's page_cgroup is protected with the last bit of the
    page_cgroup pointer, this makes handling of race conditions involving
    simultaneous mappings of a page easier.  A reference count is kept in the
    page_cgroup to deal with cases where a page might be unmapped from the RSS
    of all tasks, but still lives in the page cache.
    
    Credits go to Vaidyanathan Srinivasan for helping with reference counting work
    of the page cgroup.  Almost all of the page cache accounting code has help
    from Vaidyanathan Srinivasan.
    
    [hugh@veritas.com: fix swapoff breakage]
    [akpm@linux-foundation.org: fix locking]
    Signed-off-by: default avatarVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
    Signed-off-by: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
    Cc: Pavel Emelianov <xemul@openvz.org>
    Cc: Paul Menage <menage@google.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Cc: Kirill Korotaev <dev@sw.ru>
    Cc: Herbert Poetzl <herbert@13thfloor.at>
    Cc: David Rientjes <rientjes@google.com>
    Cc: <Valdis.Kletnieks@vt.edu>
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    8a9f3ccd
rmap.c 26.9 KB