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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-12-15 04:59:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 19:53:19 +0300
commit6514d511dbe5a77b4bdc0a7e26fd679585112e1e (patch)
treea3fcf75191b7900043172d147fc7ed8ea97f3b4a /mm/mmzone.c
parent8dd3557a52f0bc8c960307721da307370ccad6fd (diff)
downloadlinux-6514d511dbe5a77b4bdc0a7e26fd679585112e1e.tar.xz
ksm: singly-linked rmap_list
Free up a pointer in struct rmap_item, by making the mm_slot's rmap_list a singly-linked list: we always traverse that list sequentially, and we don't even lose any prefetches (but should consider adding a few later). Name it rmap_list throughout. Do we need to free up that pointer? Not immediately, and in the end, we could continue to avoid it with a union; but having done the conversion, let's keep it this way, since there's no downside, and maybe we'll want more in future (struct rmap_item is a cache-friendly 32 bytes on 32-bit and 64 bytes on 64-bit, so we shall want to avoid expanding it). Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Izik Eidus <ieidus@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmzone.c')
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