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This can prevent CMA allocations from succeeding, which are often used on platforms with co-processors (such as a DSP) that can only use physically contiguous memory. It can also prevent memory hot-unplugging from succeeding, which involves migrating at least MIN_MEMORY_BLOCK_SIZE bytes of memory, which ranges from 8 MiB to 1 GiB based on the architecture in use. Correspondingly, invalidate the BH LRU caches before a migration starts and stop any buffer_head from being cached in the LRU caches, until migration has finished. Signed-off-by: Chris Goldsworthy Signed-off-by: Minchan Kim --- fs/buffer.c | 13 +++++++++++-- include/linux/buffer_head.h | 2 ++ mm/swap.c | 5 ++++- 3 files changed, 17 insertions(+), 3 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 96c7604f69b3..de62e75d0ed0 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include @@ -1301,6 +1302,14 @@ static void bh_lru_install(struct buffer_head *bh) int i; =20 check_irqs_on(); + /* + * buffer_head in bh_lru could increase refcount of the page + * until it will be invalidated. It causes page migraion failure. + * Skip putting upcoming bh into bh_lru until migration is done. + */ + if (migrate_pending()) + return; + bh_lru_lock(); =20 b =3D this_cpu_ptr(&bh_lrus); @@ -1446,7 +1455,7 @@ EXPORT_SYMBOL(__bread_gfp); * This doesn't race because it runs in each cpu either in irq * or with preempt disabled. */ -static void invalidate_bh_lru(void *arg) +void invalidate_bh_lru(void *arg) { struct bh_lru *b =3D &get_cpu_var(bh_lrus); int i; @@ -1458,7 +1467,7 @@ static void invalidate_bh_lru(void *arg) put_cpu_var(bh_lrus); } =20 -static bool has_bh_in_lru(int cpu, void *dummy) +bool has_bh_in_lru(int cpu, void *dummy) { struct bh_lru *b =3D per_cpu_ptr(&bh_lrus, cpu); int i; diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 6b47f94378c5..3d98bdabaac9 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -194,6 +194,8 @@ void __breadahead_gfp(struct block_device *, sector_t= block, unsigned int size, struct buffer_head *__bread_gfp(struct block_device *, sector_t block, unsigned size, gfp_t gfp); void invalidate_bh_lrus(void); +void invalidate_bh_lru(void *); +bool has_bh_in_lru(int cpu, void *dummy); struct buffer_head *alloc_buffer_head(gfp_t gfp_flags); void free_buffer_head(struct buffer_head * bh); void unlock_buffer(struct buffer_head *bh); diff --git a/mm/swap.c b/mm/swap.c index e42c4b4bf2b3..14faf558347b 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -37,6 +37,7 @@ #include #include #include +#include =20 #include "internal.h" =20 @@ -641,6 +642,7 @@ void lru_add_drain_cpu(int cpu) pagevec_lru_move_fn(pvec, lru_lazyfree_fn); =20 activate_page_drain(cpu); + invalidate_bh_lru(NULL); } =20 /** @@ -827,7 +829,8 @@ void lru_add_drain_all(void) pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) || - need_activate_page_drain(cpu)) { + need_activate_page_drain(cpu) || + has_bh_in_lru(cpu, NULL)) { INIT_WORK(work, lru_add_drain_per_cpu); queue_work_on(cpu, mm_percpu_wq, work); __cpumask_set_cpu(cpu, &has_work); --=20 2.30.0.478.g8a0d178c01-goog