From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE36B13C682 for ; Thu, 7 Nov 2024 11:02:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730977357; cv=none; b=r3CuZN6P3zPMMWmCnwA+lrcf1QzKSOGU7Y1ZHLE1UQ/wqkzUezwKZNlKphVThrmJk2+3d68dGKGDZAPkV69yi4QBSdigz850JB66JKr9i/zivh9U1UwPp5SoDfqEN5LemMNnkpKzf4+DexoJ6F5xxo0JH1klgwjIJapVww8KBO4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730977357; c=relaxed/simple; bh=NQ+bwr1JB4p3kwCzYVnZV2mYuii1jbMOo79wlSQxK5g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PoytXZmnsR6PHbNdOJ/A6yd1nJdTE/ll//2xQkXCvdrplZxleZndbIA4Z+uNKxoMJ+g5Cdb7MdufH6LYZQI71/HagZ6IBbsK7rjSt8qwn3o5EGrFCRPCabR3YnLpq12PmrXhCgQGpZ6WK02SPNM+v9yjJLTSz5/9b4da29j8B/A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=aMO+2Qwy; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aMO+2Qwy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730977354; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=V0VSqFzf1J9PU1pJLz6JPLAs1jAHK7dRkghElujlsZ8=; b=aMO+2QwyqX1aKdvo6jCIqxYhyKJGeLuq/MlyAI4zC9yqM1mo5ELdHhERZIYfSn/qtkENJc 75R0/gqPW1Bilj+LcyUmScsPUBDLTd7dvbfYj1txgre5sIZ24av1t4t3FYu57JO7QQ8tBd uFRR4TI+FHN6rpU4DstRbdGA4x2DpfQ= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-624-3mZzLQx5Op2Hni-UDMWQGQ-1; Thu, 07 Nov 2024 06:02:31 -0500 X-MC-Unique: 3mZzLQx5Op2Hni-UDMWQGQ-1 X-Mimecast-MFC-AGG-ID: 3mZzLQx5Op2Hni-UDMWQGQ Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D4F3D1956095; Thu, 7 Nov 2024 11:02:29 +0000 (UTC) Received: from localhost (unknown [10.72.116.54]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 5D0AE196BC05; Thu, 7 Nov 2024 11:02:27 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org, Pavel Begunkov Cc: linux-block@vger.kernel.org, Uday Shankar , Akilesh Kailash , Ming Lei Subject: [PATCH V10 07/12] io_uring: shrink io_mapped_buf Date: Thu, 7 Nov 2024 19:01:40 +0800 Message-ID: <20241107110149.890530-8-ming.lei@redhat.com> In-Reply-To: <20241107110149.890530-1-ming.lei@redhat.com> References: <20241107110149.890530-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 `struct io_mapped_buf` will be extended to cover kernel buffer which may be in fast IO path, and `struct io_mapped_buf` needs to be per-IO. So shrink sizeof(struct io_mapped_buf) by the following ways: - folio_shift is < 64, so 6bits are enough to hold it, the remained bits can be used for the coming kernel buffer - define `acct_pages` as 'unsigned int', which is big enough for accounting pages in the buffer Signed-off-by: Ming Lei --- io_uring/rsrc.c | 2 ++ io_uring/rsrc.h | 6 +++--- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index f57c4d295f09..99ff2797e6ec 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -685,6 +685,8 @@ static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages, return false; data->folio_shift = folio_shift(folio); + WARN_ON_ONCE(data->folio_shift >= 64); + /* * Check if pages are contiguous inside a folio, and all folios have * the same page count except for the head and tail. diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index c8a4db4721ca..bf0824b4beb6 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -32,9 +32,9 @@ struct io_mapped_buf { u64 addr; unsigned int len; unsigned int nr_bvecs; - unsigned int folio_shift; refcount_t refs; - unsigned long acct_pages; + unsigned int acct_pages; + unsigned int folio_shift:6; struct bio_vec bvec[] __counted_by(nr_bvecs); }; @@ -43,7 +43,7 @@ struct io_imu_folio_data { unsigned int nr_pages_head; /* For non-head/tail folios, has to be fully included */ unsigned int nr_pages_mid; - unsigned int folio_shift; + unsigned char folio_shift; }; struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type); -- 2.47.0