From ce65cefa5debefc0e81d0a533bda467f0aa67350 Mon Sep 17 00:00:00 2001 From: Vladimir Davydov Date: Fri, 8 Aug 2014 14:21:58 -0700 Subject: [PATCH] fork: reset mm->pinned_vm mm->pinned_vm counts pages of mm's address space that were permanently pinned in memory by increasing their reference counter. The counter was introduced by commit bc3e53f682d9 ("mm: distinguish between mlocked and pinned pages"), while before it locked_vm had been used for such pages. Obviously, we should reset the counter on fork if !CLONE_VM, just like we do with locked_vm, but currently we don't. Let's fix it. This patch will fix the contents of /proc/pid/status:VmPin. ib_umem_get[infiniband] and perf_mmap still check pinned_vm against RLIMIT_MEMLOCK. It's left from the times when pinned pages were accounted under locked_vm, but today it looks wrong. It isn't clear how we should deal with it. We still have some drivers accounting pinned pages under mm->locked_vm - this is what commit bc3e53f682d9 was fighting against. It's infiniband/usnic and vfio. Signed-off-by: Vladimir Davydov Cc: Oleg Nesterov Cc: David Rientjes Cc: Christoph Lameter Cc: Roland Dreier Cc: Sean Hefty Cc: Hal Rosenstock Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-format-patch failed