First of all, we need to rename acomp_ctx->dstmem field to buffer,
since we are now using for purposes other than compression.
Then we change per-cpu mutex and buffer to per-acomp_ctx, since
them belong to the acomp_ctx and are necessary parts when used
in the compress/decompress contexts.
So we can remove the old per-cpu mutex and dstmem.
Acked-by: Chris Li <chrisl@xxxxxxxxxx> (Google)
Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
---
include/linux/cpuhotplug.h | 1 -
mm/zswap.c | 98 +++++++++++++---------------------------------
2 files changed, 28 insertions(+), 71 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index efc0c0b07efb..c3e06e21766a 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -124,7 +124,6 @@ enum cpuhp_state {
CPUHP_ARM_BL_PREPARE,
CPUHP_TRACE_RB_PREPARE,
CPUHP_MM_ZS_PREPARE,
- CPUHP_MM_ZSWP_MEM_PREPARE,
CPUHP_MM_ZSWP_POOL_PREPARE,
CPUHP_KVM_PPC_BOOK3S_PREPARE,
CPUHP_ZCOMP_PREPARE,
diff --git a/mm/zswap.c b/mm/zswap.c
index 40ee9f109f98..8014509736ad 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -166,8 +166,8 @@ struct crypto_acomp_ctx {
struct crypto_acomp *acomp;
struct acomp_req *req;
struct crypto_wait wait;
- u8 *dstmem;
- struct mutex *mutex;
+ u8 *buffer;
+ struct mutex mutex;
};
/*
@@ -694,63 +694,26 @@ static void zswap_alloc_shrinker(struct zswap_pool *pool)
/*********************************
* per-cpu code
**********************************/
-static DEFINE_PER_CPU(u8 *, zswap_dstmem);
-/*
- * If users dynamically change the zpool type and compressor at runtime, i.e.
- * zswap is running, zswap can have more than one zpool on one cpu, but they
- * are sharing dtsmem. So we need this mutex to be per-cpu.
- */
-static DEFINE_PER_CPU(struct mutex *, zswap_mutex);
-
-static int zswap_dstmem_prepare(unsigned int cpu)
-{
- struct mutex *mutex;
- u8 *dst;
-
- dst = kmalloc_node(PAGE_SIZE, GFP_KERNEL, cpu_to_node(cpu));
- if (!dst)
- return -ENOMEM;
-
- mutex = kmalloc_node(sizeof(*mutex), GFP_KERNEL, cpu_to_node(cpu));
- if (!mutex) {
- kfree(dst);
- return -ENOMEM;
- }
-
- mutex_init(mutex);
- per_cpu(zswap_dstmem, cpu) = dst;
- per_cpu(zswap_mutex, cpu) = mutex;
- return 0;
-}
-
-static int zswap_dstmem_dead(unsigned int cpu)
-{
- struct mutex *mutex;
- u8 *dst;
-
- mutex = per_cpu(zswap_mutex, cpu);
- kfree(mutex);
- per_cpu(zswap_mutex, cpu) = NULL;
-
- dst = per_cpu(zswap_dstmem, cpu);
- kfree(dst);
- per_cpu(zswap_dstmem, cpu) = NULL;
-
- return 0;
-}
-
static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
{
struct zswap_pool *pool = hlist_entry(node, struct zswap_pool, node);
struct crypto_acomp_ctx *acomp_ctx = per_cpu_ptr(pool->acomp_ctx, cpu);
struct crypto_acomp *acomp;
struct acomp_req *req;
+ int ret;
+
+ mutex_init(&acomp_ctx->mutex);
+
+ acomp_ctx->buffer = kmalloc_node(PAGE_SIZE, GFP_KERNEL, cpu_to_node(cpu));
+ if (!acomp_ctx->buffer)
+ return -ENOMEM;
acomp = crypto_alloc_acomp_node(pool->tfm_name, 0, 0, cpu_to_node(cpu));
if (IS_ERR(acomp)) {
pr_err("could not alloc crypto acomp %s : %ld\n",
pool->tfm_name, PTR_ERR(acomp));
- return PTR_ERR(acomp);
+ ret = PTR_ERR(acomp);
+ goto acomp_fail;
}
acomp_ctx->acomp = acomp;
@@ -758,8 +721,8 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
if (!req) {
pr_err("could not alloc crypto acomp_request %s\n",
pool->tfm_name);
- crypto_free_acomp(acomp_ctx->acomp);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto req_fail;
}
acomp_ctx->req = req;
@@ -772,10 +735,13 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done, &acomp_ctx->wait);
- acomp_ctx->mutex = per_cpu(zswap_mutex, cpu);
- acomp_ctx->dstmem = per_cpu(zswap_dstmem, cpu);
-
return 0;
+
+req_fail:
+ crypto_free_acomp(acomp_ctx->acomp);
+acomp_fail:
+ kfree(acomp_ctx->buffer);
+ return ret;
}
static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
@@ -788,6 +754,7 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
acomp_request_free(acomp_ctx->req);
if (!IS_ERR_OR_NULL(acomp_ctx->acomp))
crypto_free_acomp(acomp_ctx->acomp);
+ kfree(acomp_ctx->buffer);
}
return 0;
@@ -1400,12 +1367,12 @@ static void __zswap_load(struct zswap_entry *entry, struct page *page)
u8 *src;
acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
- mutex_lock(acomp_ctx->mutex);
+ mutex_lock(&acomp_ctx->mutex);
src = zpool_map_handle(zpool, entry->handle, ZPOOL_MM_RO);
if (!zpool_can_sleep_mapped(zpool)) {
- memcpy(acomp_ctx->dstmem, src, entry->length);
- src = acomp_ctx->dstmem;
+ memcpy(acomp_ctx->buffer, src, entry->length);
+ src = acomp_ctx->buffer;
zpool_unmap_handle(zpool, entry->handle);
}
@@ -1415,7 +1382,7 @@ static void __zswap_load(struct zswap_entry *entry, struct page *page)
acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, PAGE_SIZE);
BUG_ON(crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait));
BUG_ON(acomp_ctx->req->dlen != PAGE_SIZE);
- mutex_unlock(acomp_ctx->mutex);
+ mutex_unlock(&acomp_ctx->mutex);
if (zpool_can_sleep_mapped(zpool))
zpool_unmap_handle(zpool, entry->handle);
@@ -1636,9 +1603,9 @@ bool zswap_store(struct folio *folio)
/* compress */
acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
- mutex_lock(acomp_ctx->mutex);
+ mutex_lock(&acomp_ctx->mutex);
- dst = acomp_ctx->dstmem;
+ dst = acomp_ctx->buffer;
sg_init_table(&input, 1);
sg_set_page(&input, page, PAGE_SIZE, 0);
@@ -1681,7 +1648,7 @@ bool zswap_store(struct folio *folio)
buf = zpool_map_handle(zpool, handle, ZPOOL_MM_WO);
memcpy(buf, dst, dlen);
zpool_unmap_handle(zpool, handle);
- mutex_unlock(acomp_ctx->mutex);
+ mutex_unlock(&acomp_ctx->mutex);
/* populate entry */
entry->swpentry = swp_entry(type, offset);
@@ -1724,7 +1691,7 @@ bool zswap_store(struct folio *folio)
return true;
put_dstmem:
- mutex_unlock(acomp_ctx->mutex);
+ mutex_unlock(&acomp_ctx->mutex);
put_pool:
zswap_pool_put(entry->pool);
freepage:
@@ -1899,13 +1866,6 @@ static int zswap_setup(void)
goto cache_fail;
}
- ret = cpuhp_setup_state(CPUHP_MM_ZSWP_MEM_PREPARE, "mm/zswap:prepare",
- zswap_dstmem_prepare, zswap_dstmem_dead);
- if (ret) {
- pr_err("dstmem alloc failed\n");
- goto dstmem_fail;
- }
-
ret = cpuhp_setup_state_multi(CPUHP_MM_ZSWP_POOL_PREPARE,
"mm/zswap_pool:prepare",
zswap_cpu_comp_prepare,
@@ -1937,8 +1897,6 @@ static int zswap_setup(void)
if (pool)
zswap_pool_destroy(pool);
hp_fail:
- cpuhp_remove_state(CPUHP_MM_ZSWP_MEM_PREPARE);
-dstmem_fail:
kmem_cache_destroy(zswap_entry_cache);
cache_fail:
/* if built-in, we aren't unloaded on failure; don't allow use */
--
b4 0.10.1
