[v7,2/8] mm: zswap: Modify zswap_compress() to accept a page instead of a folio.

Commit Message

Kanchana P Sridhar Sept. 24, 2024, 1:17 a.m. UTC

For zswap_store() to be able to store an mTHP by compressing
it one page at a time, zswap_compress() needs to accept a page
as input. This will allow us to iterate through each page in
the mTHP in zswap_store(), compress it and store it in the zpool.

Signed-off-by: Kanchana P Sridhar <[e-mail]>
---
 mm/zswap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Nhat Pham Sept. 24, 2024, 4:50 p.m. UTC | #1

On Mon, Sep 23, 2024 at 6:17 PM Kanchana P Sridhar
<[e-mail]> wrote:
>
> For zswap_store() to be able to store an mTHP by compressing
> it one page at a time, zswap_compress() needs to accept a page
> as input. This will allow us to iterate through each page in
> the mTHP in zswap_store(), compress it and store it in the zpool.
>
> Signed-off-by: Kanchana P Sridhar <[e-mail]>

Reviewed-by: Nhat Pham <[e-mail]>

Patch

diff --git a/mm/zswap.c b/mm/zswap.c
index 449914ea9919..59b7733a62d3 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -876,7 +876,7 @@  static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
 	return 0;
 }
 
-static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
+static bool zswap_compress(struct page *page, struct zswap_entry *entry)
 {
 	struct crypto_acomp_ctx *acomp_ctx;
 	struct scatterlist input, output;
@@ -894,7 +894,7 @@  static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
 
 	dst = acomp_ctx->buffer;
 	sg_init_table(&input, 1);
-	sg_set_folio(&input, folio, PAGE_SIZE, 0);
+	sg_set_page(&input, page, PAGE_SIZE, 0);
 
 	/*
 	 * We need PAGE_SIZE * 2 here since there maybe over-compression case,
@@ -1458,7 +1458,7 @@  bool zswap_store(struct folio *folio)
 		mem_cgroup_put(memcg);
 	}
 
-	if (!zswap_compress(folio, entry))
+	if (!zswap_compress(&folio->page, entry))
 		goto put_pool;
 
 	entry->swpentry = swp;