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authorDaniel Vetter <daniel.vetter@ffwll.ch>2020-12-14 19:08:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 12:13:41 -0800
commitf920e413ff9c33c297c0bde7cc5fe8cd736112e2 (patch)
tree17a59941be41d5c7193525836ca34932879bd72a
parent871402e05b24cb56bc69df47cff960d0e0d24267 (diff)
downloadlwn-f920e413ff9c33c297c0bde7cc5fe8cd736112e2.tar.gz
lwn-f920e413ff9c33c297c0bde7cc5fe8cd736112e2.zip
mm: track mmu notifiers in fs_reclaim_acquire/release
fs_reclaim_acquire/release nicely catch recursion issues when allocating GFP_KERNEL memory against shrinkers (which gpu drivers tend to use to keep the excessive caches in check). For mmu notifier recursions we do have lockdep annotations since 23b68395c7c7 ("mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end"). But these only fire if a path actually results in some pte invalidation - for most small allocations that's very rarely the case. The other trouble is that pte invalidation can happen any time when __GFP_RECLAIM is set. Which means only really GFP_ATOMIC is a safe choice, GFP_NOIO isn't good enough to avoid potential mmu notifier recursion. I was pondering whether we should just do the general annotation, but there's always the risk for false positives. Plus I'm assuming that the core fs and io code is a lot better reviewed and tested than random mmu notifier code in drivers. Hence why I decide to only annotate for that specific case. Furthermore even if we'd create a lockdep map for direct reclaim, we'd still need to explicit pull in the mmu notifier map - there's a lot more places that do pte invalidation than just direct reclaim, these two contexts arent the same. Note that the mmu notifiers needing their own independent lockdep map is also the reason we can't hold them from fs_reclaim_acquire to fs_reclaim_release - it would nest with the acquistion in the pte invalidation code, causing a lockdep splat. And we can't remove the annotations from pte invalidation and all the other places since they're called from many other places than page reclaim. Hence we can only do the equivalent of might_lock, but on the raw lockdep map. With this we can also remove the lockdep priming added in 66204f1d2d1b ("mm/mmu_notifiers: prime lockdep") since the new annotations are strictly more powerful. Link: https://lkml.kernel.org/r/20201125162532.1299794-2-daniel.vetter@ffwll.ch Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Qian Cai <cai@lca.pw> Cc: Thomas Hellström (Intel) <thomas_os@shipmail.org> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Christian König <christian.koenig@amd.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Michel Lespinasse <walken@google.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Waiman Long <longman@redhat.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mmu_notifier.c7
-rw-r--r--mm/page_alloc.c31
2 files changed, 20 insertions, 18 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 5654dd19addc..61ee40ed804e 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -612,13 +612,6 @@ int __mmu_notifier_register(struct mmu_notifier *subscription,
mmap_assert_write_locked(mm);
BUG_ON(atomic_read(&mm->mm_users) <= 0);
- if (IS_ENABLED(CONFIG_LOCKDEP)) {
- fs_reclaim_acquire(GFP_KERNEL);
- lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
- lock_map_release(&__mmu_notifier_invalidate_range_start_map);
- fs_reclaim_release(GFP_KERNEL);
- }
-
if (!mm->notifier_subscriptions) {
/*
* kmalloc cannot be called under mm_take_all_locks(), but we
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 743fb2bccecc..2e240d3cda05 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -57,6 +57,7 @@
#include <trace/events/oom.h>
#include <linux/prefetch.h>
#include <linux/mm_inline.h>
+#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
#include <linux/hugetlb.h>
#include <linux/sched/rt.h>
@@ -4264,10 +4265,8 @@ should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_fla
static struct lockdep_map __fs_reclaim_map =
STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map);
-static bool __need_fs_reclaim(gfp_t gfp_mask)
+static bool __need_reclaim(gfp_t gfp_mask)
{
- gfp_mask = current_gfp_context(gfp_mask);
-
/* no reclaim without waiting on it */
if (!(gfp_mask & __GFP_DIRECT_RECLAIM))
return false;
@@ -4276,10 +4275,6 @@ static bool __need_fs_reclaim(gfp_t gfp_mask)
if (current->flags & PF_MEMALLOC)
return false;
- /* We're only interested __GFP_FS allocations for now */
- if (!(gfp_mask & __GFP_FS))
- return false;
-
if (gfp_mask & __GFP_NOLOCKDEP)
return false;
@@ -4298,15 +4293,29 @@ void __fs_reclaim_release(void)
void fs_reclaim_acquire(gfp_t gfp_mask)
{
- if (__need_fs_reclaim(gfp_mask))
- __fs_reclaim_acquire();
+ gfp_mask = current_gfp_context(gfp_mask);
+
+ if (__need_reclaim(gfp_mask)) {
+ if (gfp_mask & __GFP_FS)
+ __fs_reclaim_acquire();
+
+#ifdef CONFIG_MMU_NOTIFIER
+ lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
+ lock_map_release(&__mmu_notifier_invalidate_range_start_map);
+#endif
+
+ }
}
EXPORT_SYMBOL_GPL(fs_reclaim_acquire);
void fs_reclaim_release(gfp_t gfp_mask)
{
- if (__need_fs_reclaim(gfp_mask))
- __fs_reclaim_release();
+ gfp_mask = current_gfp_context(gfp_mask);
+
+ if (__need_reclaim(gfp_mask)) {
+ if (gfp_mask & __GFP_FS)
+ __fs_reclaim_release();
+ }
}
EXPORT_SYMBOL_GPL(fs_reclaim_release);
#endif