The patch titled
Subject: mm/zswap: refactor out __zswap_load()
has been added to the -mm mm-unstable branch. Its filename is
mm-zswap-refactor-out-__zswap_load.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-zswap-refactor-out-__zswap_load.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Subject: mm/zswap: refactor out __zswap_load()
Date: Mon, 18 Dec 2023 11:50:33 +0000
The zswap_load() and zswap_writeback_entry() have the same part that
decompress the data from zswap_entry to page, so refactor out the common
part as __zswap_load(entry, page).
Link: https://lkml.kernel.org/r/20231213-zswap-dstmem-v3-3-4eac09b94ece@xxxxxxxxxxxxx
Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Reviewed-by: Nhat Pham <nphamcs@xxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zswap.c | 92 +++++++++++++++++----------------------------------
1 file changed, 32 insertions(+), 60 deletions(-)
--- a/mm/zswap.c~mm-zswap-refactor-out-__zswap_load
+++ a/mm/zswap.c
@@ -1392,6 +1392,35 @@ static int zswap_enabled_param_set(const
return ret;
}
+static void __zswap_load(struct zswap_entry *entry, struct page *page)
+{
+ struct zpool *zpool = zswap_find_zpool(entry);
+ struct scatterlist input, output;
+ struct crypto_acomp_ctx *acomp_ctx;
+ u8 *src;
+
+ 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(acomp_ctx->dstmem, src, entry->length);
+ src = acomp_ctx->dstmem;
+ zpool_unmap_handle(zpool, entry->handle);
+ }
+
+ sg_init_one(&input, src, entry->length);
+ sg_init_table(&output, 1);
+ sg_set_page(&output, page, PAGE_SIZE, 0);
+ 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);
+
+ if (zpool_can_sleep_mapped(zpool))
+ zpool_unmap_handle(zpool, entry->handle);
+}
+
/*********************************
* writeback code
**********************************/
@@ -1413,12 +1442,7 @@ static int zswap_writeback_entry(struct
swp_entry_t swpentry = entry->swpentry;
struct page *page;
struct mempolicy *mpol;
- struct scatterlist input, output;
- struct crypto_acomp_ctx *acomp_ctx;
- struct zpool *pool = zswap_find_zpool(entry);
bool page_was_allocated;
- u8 *src;
- unsigned int dlen;
int ret;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
@@ -1456,31 +1480,7 @@ static int zswap_writeback_entry(struct
}
spin_unlock(&tree->lock);
- /* 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(acomp_ctx->dstmem, src, entry->length);
- src = acomp_ctx->dstmem;
- zpool_unmap_handle(pool, entry->handle);
- }
-
- sg_init_one(&input, src, entry->length);
- sg_init_table(&output, 1);
- sg_set_page(&output, page, PAGE_SIZE, 0);
- acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, dlen);
- ret = crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait);
- dlen = acomp_ctx->req->dlen;
- mutex_unlock(acomp_ctx->mutex);
-
- if (zpool_can_sleep_mapped(pool))
- zpool_unmap_handle(pool, entry->handle);
-
- BUG_ON(ret);
- BUG_ON(dlen != PAGE_SIZE);
+ __zswap_load(entry, page);
/* page is up to date */
SetPageUptodate(page);
@@ -1753,11 +1753,7 @@ bool zswap_load(struct folio *folio)
struct page *page = &folio->page;
struct zswap_tree *tree = zswap_trees[type];
struct zswap_entry *entry;
- struct scatterlist input, output;
- struct crypto_acomp_ctx *acomp_ctx;
- u8 *src, *dst;
- struct zpool *zpool;
- unsigned int dlen;
+ u8 *dst;
bool ret;
VM_WARN_ON_ONCE(!folio_test_locked(folio));
@@ -1779,31 +1775,7 @@ bool zswap_load(struct folio *folio)
goto stats;
}
- zpool = zswap_find_zpool(entry);
-
- /* decompress */
- dlen = PAGE_SIZE;
- 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(acomp_ctx->dstmem, src, entry->length);
- src = acomp_ctx->dstmem;
- zpool_unmap_handle(zpool, entry->handle);
- }
-
- sg_init_one(&input, src, entry->length);
- sg_init_table(&output, 1);
- sg_set_page(&output, page, PAGE_SIZE, 0);
- acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, dlen);
- if (crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait))
- WARN_ON(1);
- mutex_unlock(acomp_ctx->mutex);
-
- if (zpool_can_sleep_mapped(zpool))
- zpool_unmap_handle(zpool, entry->handle);
-
+ __zswap_load(entry, page);
ret = true;
stats:
count_vm_event(ZSWPIN);
_
Patches currently in -mm which might be from zhouchengming@xxxxxxxxxxxxx are
mm-zswap-change-dstmem-size-to-one-page.patch
mm-zswap-reuse-dstmem-when-decompress.patch
mm-zswap-refactor-out-__zswap_load.patch
mm-zswap-cleanup-zswap_load.patch
mm-zswap-cleanup-zswap_writeback_entry.patch
mm-zswap-directly-use-percpu-mutex-and-buffer-in-load-store.patch
