From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: [PATCH v3 09/18] io_uring/memmap: add IO_REGION_F_SINGLE_REF
Date: Fri, 29 Nov 2024 13:34:30 +0000 [thread overview]
Message-ID: <a7abfa7535e9728d5fcade29a1ea1605ec2c04ce.1732886067.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Kernel allocated compound pages will have just one reference for the
entire page array, add a flag telling io_free_region about that.
Signed-off-by: Pavel Begunkov <[email protected]>
---
io_uring/memmap.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 5d261e07c2e3..a37ccb167258 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -207,15 +207,23 @@ enum {
IO_REGION_F_VMAP = 1,
/* memory is provided by user and pinned by the kernel */
IO_REGION_F_USER_PROVIDED = 2,
+ /* only the first page in the array is ref'ed */
+ IO_REGION_F_SINGLE_REF = 4,
};
void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
{
if (mr->pages) {
+ long nr_refs = mr->nr_pages;
+
+ if (mr->flags & IO_REGION_F_SINGLE_REF)
+ nr_refs = 1;
+
if (mr->flags & IO_REGION_F_USER_PROVIDED)
- unpin_user_pages(mr->pages, mr->nr_pages);
+ unpin_user_pages(mr->pages, nr_refs);
else
- release_pages(mr->pages, mr->nr_pages);
+ release_pages(mr->pages, nr_refs);
+
kvfree(mr->pages);
}
if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr)
--
2.47.1
next prev parent reply other threads:[~2024-11-29 13:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-29 13:34 [PATCH v3 00/18] kernel allocated regions and convert memmap to regions Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 01/18] io_uring: rename ->resize_lock Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 02/18] io_uring/rsrc: export io_check_coalesce_buffer Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 03/18] io_uring/memmap: flag vmap'ed regions Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 04/18] io_uring/memmap: flag regions with user pages Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 05/18] io_uring/memmap: account memory before pinning Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 06/18] io_uring/memmap: reuse io_free_region for failure path Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 07/18] io_uring/memmap: optimise single folio regions Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 08/18] io_uring/memmap: helper for pinning region pages Pavel Begunkov
2024-11-29 13:34 ` Pavel Begunkov [this message]
2024-11-29 13:34 ` [PATCH v3 10/18] io_uring/memmap: implement kernel allocated regions Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 11/18] io_uring/memmap: implement mmap for regions Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 12/18] io_uring: pass ctx to io_register_free_rings Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 13/18] io_uring: use region api for SQ Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 14/18] io_uring: use region api for CQ Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 15/18] io_uring/kbuf: use mmap_lock to sync with mmap Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 16/18] io_uring/kbuf: remove pbuf ring refcounting Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 17/18] io_uring/kbuf: use region api for pbuf rings Pavel Begunkov
2024-11-29 13:34 ` [PATCH v3 18/18] io_uring/memmap: unify io_uring mmap'ing code Pavel Begunkov
2024-11-29 16:04 ` [PATCH v3 00/18] kernel allocated regions and convert memmap to regions Jens Axboe
2024-11-29 16:06 ` Jens Axboe
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