• Vlastimil Babka's avatar
    mm, sl[ou]b: improve memory accounting · 6a486c0a
    Vlastimil Babka authored
    Patch series "guarantee natural alignment for kmalloc()", v2.
    
    This patch (of 2):
    
    SLOB currently doesn't account its pages at all, so in /proc/meminfo the
    Slab field shows zero.  Modifying a counter on page allocation and
    freeing should be acceptable even for the small system scenarios SLOB is
    intended for.  Since reclaimable caches are not separated in SLOB,
    account everything as unreclaimable.
    
    SLUB currently doesn't account kmalloc() and kmalloc_node() allocations
    larger than order-1 page, that are passed directly to the page
    allocator.  As they also don't appear in /proc/slabinfo, it might look
    like a memory leak.  For consistency, account them as well.  (SLAB
    doesn't actually use page allocator directly, so no change there).
    
    Ideally SLOB and SLUB would be handled in separate patches, but due to
    the shared kmalloc_order() function and different kfree()
    implementations, it's easier to patch both at once to prevent
    inconsistencies.
    
    Link: http://lkml.kernel.org/r/20190826111627.7505-2-vbabka@suse.czSigned-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Pekka Enberg <penberg@kernel.org>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Ming Lei <ming.lei@redhat.com>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Matthew Wilcox <willy@infradead.org>
    Cc: "Darrick J . Wong" <darrick.wong@oracle.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    6a486c0a
slab_common.c 43.9 KB