The quilt patch titled
Subject: mm/zswap: reuse dstmem when decompress
has been removed from the -mm tree. Its filename was
mm-zswap-reuse-dstmem-when-decompress.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Subject: mm/zswap: reuse dstmem when decompress
Date: Thu, 28 Dec 2023 09:45:42 +0000
Patch series "mm/zswap: dstmem reuse optimizations and cleanups", v5.
The problem this series tries to optimize is that zswap_load() and
zswap_writeback_entry() have to malloc a temporary memory to support
!zpool_can_sleep_mapped(). We can avoid it by reusing the percpu
crypto_acomp_ctx->dstmem, which is also used by zswap_store() and
protected by the same percpu crypto_acomp_ctx->mutex.
This patch (of 5):
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.
Link: https://lkml.kernel.org/r/20231213-zswap-dstmem-v5-0-9382162bbf05@xxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20231213-zswap-dstmem-v5-1-9382162bbf05@xxxxxxxxxxxxx
Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Reviewed-by: Nhat Pham <nphamcs@xxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Acked-by: Chris Li <chrisl@xxxxxxxxxx> (Google)
Cc: Barry Song <21cnbao@xxxxxxxxx>
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 | 44 ++++++++++++--------------------------------
1 file changed, 12 insertions(+), 32 deletions(-)
--- a/mm/zswap.c~mm-zswap-reuse-dstmem-when-decompress
+++ a/mm/zswap.c
@@ -1408,19 +1408,13 @@ static int zswap_writeback_entry(struct
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,
@@ -1456,15 +1450,15 @@ static int zswap_writeback_entry(struct
/* 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);
@@ -1473,9 +1467,7 @@ static int zswap_writeback_entry(struct
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);
@@ -1494,9 +1486,6 @@ static int zswap_writeback_entry(struct
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
@@ -1758,7 +1747,7 @@ 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;
@@ -1783,26 +1772,19 @@ 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);
@@ -1813,15 +1795,13 @@ 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);
_
Patches currently in -mm which might be from zhouchengming@xxxxxxxxxxxxx are
