linux-kernel - [RFC 25/43] mm: shmem: specify the mm to use when inserting pages

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Date:   Wed,  6 May 2020 17:41:51 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: [RFC 25/43] mm: shmem: specify the mm to use when inserting pages

Explicitly specify the mm to pass to shmem_insert_page() when
the pkram_stream is initialized rather than use the mm of the
current thread.  This will allow for multiple kernel threads to
target the same mm when inserting pages in parallel.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 include/linux/pkram.h | 1 +
 mm/pkram.c            | 1 +
 mm/shmem_pkram.c      | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/pkram.h b/include/linux/pkram.h
index b47b3aef16e3..cbb79d2803c0 100644
--- a/include/linux/pkram.h
+++ b/include/linux/pkram.h
@@ -18,6 +18,7 @@ struct pkram_stream {
 
 	unsigned long next_index;
 	struct address_space *mapping;
+	struct mm_struct *mm;
 
 	/* byte data */
 	struct page *data_page;
diff --git a/mm/pkram.c b/mm/pkram.c
index 4d4d836fea53..a5e539052af6 100644
--- a/mm/pkram.c
+++ b/mm/pkram.c
@@ -565,6 +565,7 @@ static void pkram_stream_init(struct pkram_stream *ps,
 	memset(ps, 0, sizeof(*ps));
 	ps->gfp_mask = gfp_mask;
 	ps->node = node;
+	ps->mm = current->mm;
 }
 
 static void pkram_stream_init_obj(struct pkram_stream *ps, struct pkram_obj *obj)
diff --git a/mm/shmem_pkram.c b/mm/shmem_pkram.c
index 3fa9cfbe0003..c97d64393822 100644
--- a/mm/shmem_pkram.c
+++ b/mm/shmem_pkram.c
@@ -236,7 +236,7 @@ static int load_file_content(struct pkram_stream *ps)
 		if (!page)
 			break;
 
-		err = shmem_insert_page(current->mm, ps->mapping->host, index, page);
+		err = shmem_insert_page(ps->mm, ps->mapping->host, index, page);
 		put_page(page);
 	} while (!err);
 
-- 
2.13.3