From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 1/2] io_uring: don't miscount pinned memory
Date: Sat, 18 Jul 2020 11:31:20 +0300 [thread overview]
Message-ID: <2d9117b714bdf47de13374cc861c0ffd141da0c4.1595017706.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
io_sqe_buffer_unregister() uses cxt->sqo_mm for memory accounting, but
io_ring_ctx_free() drops ->sqo_mm before leaving pinned_vm
over-accounted. Postpone mm cleanup for when it's not needed anymore.
Fixes: 309758254ea62 ("io_uring: report pinned memory usage")
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 644e5727389c..e535152fefab 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7655,12 +7655,12 @@ static void io_destroy_buffers(struct io_ring_ctx *ctx)
static void io_ring_ctx_free(struct io_ring_ctx *ctx)
{
io_finish_async(ctx);
+ io_sqe_buffer_unregister(ctx);
if (ctx->sqo_mm) {
mmdrop(ctx->sqo_mm);
ctx->sqo_mm = NULL;
}
- io_sqe_buffer_unregister(ctx);
io_sqe_files_unregister(ctx);
io_eventfd_unregister(ctx);
io_destroy_buffers(ctx);
--
2.24.0
next prev parent reply other threads:[~2020-07-18 8:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-18 8:31 [PATCH 5.9 0/2] memory accounting fixes Pavel Begunkov
2020-07-18 8:31 ` Pavel Begunkov [this message]
2020-07-18 8:31 ` [PATCH 2/2] io_uring: return locked and pinned page accounting Pavel Begunkov
2020-07-18 14:37 ` [PATCH 5.9 0/2] memory accounting fixes Jens Axboe
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