From: Naoya Horiguchi Date: Thu, 17 Mar 2016 21:17:44 +0000 (-0700) Subject: /proc/kpageflags: return KPF_SLAB for slab tail pages X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0a71649cb724ab97df26baa7731ac31d2364bfe5;p=openwrt%2Fstaging%2Fblogic.git /proc/kpageflags: return KPF_SLAB for slab tail pages Currently /proc/kpageflags returns just KPF_COMPOUND_TAIL for slab tail pages, which is inconvenient when grasping how slab pages are distributed (userspace always needs to check which kind of tail pages by itself). This patch sets KPF_SLAB for such pages. With this patch: $ grep Slab /proc/meminfo ; tools/vm/page-types -b slab Slab: 64880 kB flags page-count MB symbolic-flags long-symbolic-flags 0x0000000000000080 16220 63 _______S__________________________________ slab total 16220 63 16220 pages equals to 64880 kB, so returned result is consistent with the global counter. Signed-off-by: Naoya Horiguchi Reviewed-by: Vladimir Davydov Cc: Konstantin Khlebnikov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/proc/page.c b/fs/proc/page.c index 0be626d85331..712f1b9992cc 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -160,6 +160,8 @@ u64 stable_page_flags(struct page *page) u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked); u |= kpf_copy_bit(k, KPF_SLAB, PG_slab); + if (PageTail(page) && PageSlab(compound_head(page))) + u |= 1 << KPF_SLAB; u |= kpf_copy_bit(k, KPF_ERROR, PG_error); u |= kpf_copy_bit(k, KPF_DIRTY, PG_dirty);