In the !zpool_can_sleep_mapped() case such as zsmalloc, we need to first
copy the entry->handle memory to a temporary memory, which is allocated
using kmalloc.
Obviously we can reuse the per-compressor dstmem to avoid allocating
every time, since it's percpu-compressor and protected in percpu mutex.
Reviewed-by: Nhat Pham <nphamcs@xxxxxxxxx>
Acked-by: Chris Li <chrisl@xxxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
---
mm/zswap.c | 44 ++++++++++++--------------------------------
1 file changed, 12 insertions(+), 32 deletions(-)
diff --git a/mm/zswap.c b/mm/zswap.c
index 976f278aa507..6b872744e962 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1417,19 +1417,13 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
struct crypto_acomp_ctx *acomp_ctx;
struct zpool *pool = zswap_find_zpool(entry);
bool page_was_allocated;
- u8 *src, *tmp = NULL;
+ u8 *src;
unsigned int dlen;
int ret;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
};
- if (!zpool_can_sleep_mapped(pool)) {
- tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!tmp)
- return -ENOMEM;
- }
-
/* try to allocate swap cache page */
mpol = get_task_policy(current);
page = __read_swap_cache_async(swpentry, GFP_KERNEL, mpol,
@@ -1465,15 +1459,15 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
/* decompress */
acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
dlen = PAGE_SIZE;
+ mutex_lock(acomp_ctx->mutex);
src = zpool_map_handle(pool, entry->handle, ZPOOL_MM_RO);
if (!zpool_can_sleep_mapped(pool)) {
- memcpy(tmp, src, entry->length);
- src = tmp;
+ memcpy(acomp_ctx->dstmem, src, entry->length);
+ src = acomp_ctx->dstmem;
zpool_unmap_handle(pool, entry->handle);
}
- mutex_lock(acomp_ctx->mutex);
sg_init_one(&input, src, entry->length);
sg_init_table(&output, 1);
sg_set_page(&output, page, PAGE_SIZE, 0);
@@ -1482,9 +1476,7 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
dlen = acomp_ctx->req->dlen;
mutex_unlock(acomp_ctx->mutex);
- if (!zpool_can_sleep_mapped(pool))
- kfree(tmp);
- else
+ if (zpool_can_sleep_mapped(pool))
zpool_unmap_handle(pool, entry->handle);
BUG_ON(ret);
@@ -1508,9 +1500,6 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
return ret;
fail:
- if (!zpool_can_sleep_mapped(pool))
- kfree(tmp);
-
/*
* If we get here because the page is already in swapcache, a
* load may be happening concurrently. It is safe and okay to
@@ -1771,7 +1760,7 @@ bool zswap_load(struct folio *folio)
struct zswap_entry *entry;
struct scatterlist input, output;
struct crypto_acomp_ctx *acomp_ctx;
- u8 *src, *dst, *tmp;
+ u8 *src, *dst;
struct zpool *zpool;
unsigned int dlen;
bool ret;
@@ -1796,26 +1785,19 @@ bool zswap_load(struct folio *folio)
}
zpool = zswap_find_zpool(entry);
- if (!zpool_can_sleep_mapped(zpool)) {
- tmp = kmalloc(entry->length, GFP_KERNEL);
- if (!tmp) {
- ret = false;
- goto freeentry;
- }
- }
/* decompress */
dlen = PAGE_SIZE;
- src = zpool_map_handle(zpool, entry->handle, ZPOOL_MM_RO);
+ acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
+ mutex_lock(acomp_ctx->mutex);
+ src = zpool_map_handle(zpool, entry->handle, ZPOOL_MM_RO);
if (!zpool_can_sleep_mapped(zpool)) {
- memcpy(tmp, src, entry->length);
- src = tmp;
+ memcpy(acomp_ctx->dstmem, src, entry->length);
+ src = acomp_ctx->dstmem;
zpool_unmap_handle(zpool, entry->handle);
}
- acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
- mutex_lock(acomp_ctx->mutex);
sg_init_one(&input, src, entry->length);
sg_init_table(&output, 1);
sg_set_page(&output, page, PAGE_SIZE, 0);
@@ -1826,15 +1808,13 @@ bool zswap_load(struct folio *folio)
if (zpool_can_sleep_mapped(zpool))
zpool_unmap_handle(zpool, entry->handle);
- else
- kfree(tmp);
ret = true;
stats:
count_vm_event(ZSWPIN);
if (entry->objcg)
count_objcg_event(entry->objcg, ZSWPIN);
-freeentry:
+
spin_lock(&tree->lock);
if (ret && zswap_exclusive_loads_enabled) {
zswap_invalidate_entry(tree, entry);
--
b4 0.10.1
