• Konstantin Khlebnikov's avatar
    mm: kill vma flag VM_RESERVED and mm->reserved_vm counter · 314e51b9
    Konstantin Khlebnikov authored
    A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA,
    currently it lost original meaning but still has some effects:
    
     | effect                 | alternative flags
    -+------------------------+---------------------------------------------
    1| account as reserved_vm | VM_IO
    2| skip in core dump      | VM_IO, VM_DONTDUMP
    3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
    4| do not mlock           | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
    
    This patch removes reserved_vm counter from mm_struct.  Seems like nobody
    cares about it, it does not exported into userspace directly, it only
    reduces total_vm showed in proc.
    
    Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP.
    
    remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP.
    remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP.
    
    [akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup]
    Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@openvz.org>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Carsten Otte <cotte@de.ibm.com>
    Cc: Chris Metcalf <cmetcalf@tilera.com>
    Cc: Cyrill Gorcunov <gorcunov@openvz.org>
    Cc: Eric Paris <eparis@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: James Morris <james.l.morris@oracle.com>
    Cc: Jason Baron <jbaron@redhat.com>
    Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
    Cc: Matt Helsley <matthltc@us.ibm.com>
    Cc: Nick Piggin <npiggin@kernel.dk>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Robert Richter <robert.richter@amd.com>
    Cc: Suresh Siddha <suresh.b.siddha@intel.com>
    Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
    Cc: Venkatesh Pallipadi <venki@google.com>
    Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    314e51b9
gntalloc.c 15.3 KB