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Subject[PATCH] lockdep: fix fs_reclaim annotation
Date
From: Omar Sandoval <osandov@fb.com>

While revisiting my Btrfs swapfile series [1], I introduced a situation
in which reclaim would lock i_rwsem, and even though the swapon() path
clearly made GFP_KERNEL allocations while holding i_rwsem, I got no
complaints from lockdep. It turns out that the rework of the fs_reclaim
annotation was broken: if the current task has PF_MEMALLOC set, we don't
acquire the dummy fs_reclaim lock, but when reclaiming we always check
this _after_ we've just set the PF_MEMALLOC flag. In most cases, we can
fix this by moving the fs_reclaim_{acquire,release}() outside of the
memalloc_noreclaim_{save,restore}(), althought kswapd is slightly
different. After applying this, I got the expected lockdep splats.

1: https://lwn.net/Articles/625412/
Fixes: d92a8cfcb37e ("locking/lockdep: Rework FS_RECLAIM annotation")
Signed-off-by: Omar Sandoval <osandov@fb.com>
---
include/linux/sched/mm.h | 4 ++++
mm/page_alloc.c | 20 +++++++++++++++-----
mm/vmscan.c | 20 +++++++++++++-------
3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 2c570cd934af..93294695688a 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -163,9 +163,13 @@ static inline gfp_t current_gfp_context(gfp_t flags)
}

#ifdef CONFIG_LOCKDEP
+extern void __fs_reclaim_acquire(void);
+extern void __fs_reclaim_release(void);
extern void fs_reclaim_acquire(gfp_t gfp_mask);
extern void fs_reclaim_release(gfp_t gfp_mask);
#else
+static inline void __fs_reclaim_acquire(void) { }
+static inline void __fs_reclaim_release(void) { }
static inline void fs_reclaim_acquire(gfp_t gfp_mask) { }
static inline void fs_reclaim_release(gfp_t gfp_mask) { }
#endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 905db9d7962f..ddcbcf8dae05 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3708,7 +3708,7 @@ should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_fla
#endif /* CONFIG_COMPACTION */

#ifdef CONFIG_LOCKDEP
-struct lockdep_map __fs_reclaim_map =
+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)
@@ -3733,17 +3733,27 @@ static bool __need_fs_reclaim(gfp_t gfp_mask)
return true;
}

+void __fs_reclaim_acquire(void)
+{
+ lock_map_acquire(&__fs_reclaim_map);
+}
+
+void __fs_reclaim_release(void)
+{
+ lock_map_release(&__fs_reclaim_map);
+}
+
void fs_reclaim_acquire(gfp_t gfp_mask)
{
if (__need_fs_reclaim(gfp_mask))
- lock_map_acquire(&__fs_reclaim_map);
+ __fs_reclaim_acquire();
}
EXPORT_SYMBOL_GPL(fs_reclaim_acquire);

void fs_reclaim_release(gfp_t gfp_mask)
{
if (__need_fs_reclaim(gfp_mask))
- lock_map_release(&__fs_reclaim_map);
+ __fs_reclaim_release();
}
EXPORT_SYMBOL_GPL(fs_reclaim_release);
#endif
@@ -3761,8 +3771,8 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,

/* We now go into synchronous reclaim */
cpuset_memory_pressure_bump();
- noreclaim_flag = memalloc_noreclaim_save();
fs_reclaim_acquire(gfp_mask);
+ noreclaim_flag = memalloc_noreclaim_save();
reclaim_state.reclaimed_slab = 0;
current->reclaim_state = &reclaim_state;

@@ -3770,8 +3780,8 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,
ac->nodemask);

current->reclaim_state = NULL;
- fs_reclaim_release(gfp_mask);
memalloc_noreclaim_restore(noreclaim_flag);
+ fs_reclaim_release(gfp_mask);

cond_resched();

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8b920ce3ae02..68ed72b52c59 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3299,11 +3299,15 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
.may_unmap = 1,
.may_swap = 1,
};
+
+ __fs_reclaim_acquire();
+
count_vm_event(PAGEOUTRUN);

do {
unsigned long nr_reclaimed = sc.nr_reclaimed;
bool raise_priority = true;
+ bool ret;

sc.reclaim_idx = classzone_idx;

@@ -3376,7 +3380,10 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
wake_up_all(&pgdat->pfmemalloc_wait);

/* Check if kswapd should be suspending */
- if (try_to_freeze() || kthread_should_stop())
+ __fs_reclaim_release();
+ ret = try_to_freeze();
+ __fs_reclaim_acquire();
+ if (ret || kthread_should_stop())
break;

/*
@@ -3393,6 +3400,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)

out:
snapshot_refaults(NULL, pgdat);
+ __fs_reclaim_release();
/*
* Return the order kswapd stopped reclaiming at as
* prepare_kswapd_sleep() takes it into account. If another caller
@@ -3581,9 +3589,7 @@ static int kswapd(void *p)
*/
trace_mm_vmscan_kswapd_wake(pgdat->node_id, classzone_idx,
alloc_order);
- fs_reclaim_acquire(GFP_KERNEL);
reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx);
- fs_reclaim_release(GFP_KERNEL);
if (reclaim_order < alloc_order)
goto kswapd_try_sleep;
}
@@ -3665,16 +3671,16 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
unsigned long nr_reclaimed;
unsigned int noreclaim_flag;

- noreclaim_flag = memalloc_noreclaim_save();
fs_reclaim_acquire(sc.gfp_mask);
+ noreclaim_flag = memalloc_noreclaim_save();
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;

nr_reclaimed = do_try_to_free_pages(zonelist, &sc);

p->reclaim_state = NULL;
- fs_reclaim_release(sc.gfp_mask);
memalloc_noreclaim_restore(noreclaim_flag);
+ fs_reclaim_release(sc.gfp_mask);

return nr_reclaimed;
}
@@ -3851,6 +3857,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
};

cond_resched();
+ fs_reclaim_acquire(sc.gfp_mask);
/*
* We need to be able to allocate from the reserves for RECLAIM_UNMAP
* and we also need to be able to write out pages for RECLAIM_WRITE
@@ -3858,7 +3865,6 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
*/
noreclaim_flag = memalloc_noreclaim_save();
p->flags |= PF_SWAPWRITE;
- fs_reclaim_acquire(sc.gfp_mask);
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;

@@ -3873,9 +3879,9 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
}

p->reclaim_state = NULL;
- fs_reclaim_release(gfp_mask);
current->flags &= ~PF_SWAPWRITE;
memalloc_noreclaim_restore(noreclaim_flag);
+ fs_reclaim_release(sc.gfp_mask);
return sc.nr_reclaimed >= nr_pages;
}

--
2.17.0
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