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FROMLIST: mm: fs: Invalidate BH LRU during page migration

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Pages containing buffer_heads that are in one of the per-CPU
buffer_head LRU caches will be pinned and thus cannot be migrated.
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.

Bug: 180018981
Link: https://lore.kernel.org/linux-mm/20210310161429.399432-3-minchan@kernel.org/
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I7ac085c2ec14a81c3c4d7b65a7eeedb0cfba4ea6
This commit is contained in:
Minchan Kim
2021-03-11 15:28:55 -08:00
parent 3039d8580c
commit 169ddec367
3 changed files with 18 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
fs/buffer.c
View File

@@ -1265,6 +1265,14 @@ static void bh_lru_install(struct buffer_head *bh)
int i;
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 (lru_cache_disabled())
return;
bh_lru_lock();
b = this_cpu_ptr(&bh_lrus);
@@ -1410,7 +1418,7 @@ 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 = &get_cpu_var(bh_lrus);
int i;
@@ -1422,7 +1430,7 @@ static void invalidate_bh_lru(void *arg)
put_cpu_var(bh_lrus);
}
static bool has_bh_in_lru(int cpu, void *dummy)
bool has_bh_in_lru(int cpu, void *dummy)
{
struct bh_lru *b = per_cpu_ptr(&bh_lrus, cpu);
int i;

4
include/linux/buffer_head.h
View File

@@ -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 *arg);
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);
@@ -406,6 +408,8 @@ static inline int inode_has_buffers(struct inode *inode) { return 0; }
static inline void invalidate_inode_buffers(struct inode *inode) {}
static inline int remove_inode_buffers(struct inode *inode) { return 1; }
static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
static inline void invalidate_bh_lru(void *arg) {}
static inline bool has_bh_in_lru(int cpu, void *dummy) { return 0; }
#define buffer_heads_over_limit 0
#endif /* CONFIG_BLOCK */

5
mm/swap.c
View File

@@ -36,6 +36,7 @@
#include <linux/hugetlb.h>
#include <linux/page_idle.h>
#include <linux/local_lock.h>
#include <linux/buffer_head.h>
#include "internal.h"
@@ -665,6 +666,7 @@ void lru_add_drain_cpu(int cpu)
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
activate_page_drain(cpu);
invalidate_bh_lru(NULL);
}
/**
@@ -852,7 +854,8 @@ static void __lru_add_drain_all(bool force_all_cpus)
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);