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From: Ralph Campbell <rcampbell@nvidia.com>
To: <linux-rdma@vger.kernel.org>, <linux-mm@kvack.org>,
	<nouveau@lists.freedesktop.org>, <kvm-ppc@vger.kernel.org>,
	<linux-kselftest@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Jerome Glisse <jglisse@redhat.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Christoph Hellwig <hch@lst.de>,
	Jason Gunthorpe <jgg@mellanox.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	Shuah Khan <shuah@kernel.org>, "Ben Skeggs" <bskeggs@redhat.com>,
	Bharata B Rao <bharata@linux.ibm.com>,
	"Ralph Campbell" <rcampbell@nvidia.com>
Subject: [PATCH v4 6/6] mm/migrate: remove range invalidation in migrate_vma_pages()
Date: Thu, 23 Jul 2020 15:30:04 -0700	[thread overview]
Message-ID: <20200723223004.9586-7-rcampbell@nvidia.com> (raw)
In-Reply-To: <20200723223004.9586-1-rcampbell@nvidia.com>

When migrating the special zero page, migrate_vma_pages() calls
mmu_notifier_invalidate_range_start() before replacing the zero page
PFN in the CPU page tables. This is unnecessary since the range was
invalidated in migrate_vma_setup() and the page table entry is checked
to be sure it hasn't changed between migrate_vma_setup() and
migrate_vma_pages(). Therefore, remove the redundant invalidation.
DKIM-Signature: v\x01 a\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0

WARNING: multiple messages have this Message-ID (diff)
From: Ralph Campbell <rcampbell@nvidia.com>
To: <linux-rdma@vger.kernel.org>, <linux-mm@kvack.org>,
	<nouveau@lists.freedesktop.org>, <kvm-ppc@vger.kernel.org>,
	<linux-kselftest@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Jerome Glisse <jglisse@redhat.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Christoph Hellwig <hch@lst.de>,
	Jason Gunthorpe <jgg@mellanox.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	Shuah Khan <shuah@kernel.org>, "Ben Skeggs" <bskeggs@redhat.com>,
	Bharata B Rao <bharata@linux.ibm.com>,
	"Ralph Campbell" <rcampbell@nvidia.com>
Subject: [PATCH v4 6/6] mm/migrate: remove range invalidation in migrate_vma_pages()
Date: Thu, 23 Jul 2020 15:30:04 -0700	[thread overview]
Message-ID: <20200723223004.9586-7-rcampbell@nvidia.com> (raw)
In-Reply-To: <20200723223004.9586-1-rcampbell@nvidia.com>

When migrating the special zero page, migrate_vma_pages() calls
mmu_notifier_invalidate_range_start() before replacing the zero page
PFN in the CPU page tables. This is unnecessary since the range was
invalidated in migrate_vma_setup() and the page table entry is checked
to be sure it hasn't changed between migrate_vma_setup() and
migrate_vma_pages(). Therefore, remove the redundant invalidation.
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1;
	t\x1595543388; bh=Y8qnSzc0udfc4m+P6cziRmRJk5XEGcgDU5ImloLrCuE=;
	h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer:
	 In-Reply-To:References:MIME-Version:X-NVConfidentiality:
	 Content-Transfer-Encoding:Content-Type;
	b=rIyLVqKU1Kxf67Qz9TIZ2f1lAaP7YxvFgCZR8v0Vw1fwq7aUbMbgfzcF0bd6+XzG6
	 ZHtBRMp/Zu/ZLGRxP6lBqZo4wHMHbuW3fXOvPCrYTD5YsCCLv+Ao4RmreWyec2wBTk
	 uBo3ZylCHJ0ckD85BcjQQxpXyY99cBsvIomZw9wzg6QGm7Ksbq6d+UKSkb0L04d6v8
	 fiRvvLNq3kCbPzrifaBTj3klQcVcKXz34km0XUoRQlSaftlq4BJWopBPX8U7gQtstO
	 OvA7Al9t87sCpKjSnqjE7N1jThU0KzjPrCxJiEHq/0Vf4sqeUA42bOkc+bk/CV1ZSF
	 n9jm36j4kRTUg=
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
---
 mm/migrate.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 96e1f41a991e..36076ba2f51a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2877,9 +2877,7 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 {
 	const unsigned long npages = migrate->npages;
 	const unsigned long start = migrate->start;
-	struct mmu_notifier_range range;
 	unsigned long addr, i;
-	bool notified = false;
 
 	for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
 		struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
@@ -2895,16 +2893,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (!page) {
 			if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
 				continue;
-			if (!notified) {
-				notified = true;
-
-				mmu_notifier_range_init(&range,
-							MMU_NOTIFY_CLEAR, 0,
-							NULL,
-							migrate->vma->vm_mm,
-							addr, migrate->end);
-				mmu_notifier_invalidate_range_start(&range);
-			}
 			migrate_vma_insert_page(migrate, addr, newpage,
 						&migrate->src[i],
 						&migrate->dst[i]);
@@ -2937,14 +2925,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (r != MIGRATEPAGE_SUCCESS)
 			migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
 	}
-
-	/*
-	 * No need to double call mmu_notifier->invalidate_range() callback as
-	 * the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
-	 * did already call it.
-	 */
-	if (notified)
-		mmu_notifier_invalidate_range_only_end(&range);
 }
 EXPORT_SYMBOL(migrate_vma_pages);
 
-- 
2.20.1



WARNING: multiple messages have this Message-ID (diff)
From: Ralph Campbell <rcampbell-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
To: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kselftest-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Ralph Campbell
	<rcampbell-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Bharata B Rao <bharata-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org>,
	Jason Gunthorpe <jgg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Shuah Khan <shuah-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: [PATCH v4 6/6] mm/migrate: remove range invalidation in migrate_vma_pages()
Date: Thu, 23 Jul 2020 15:30:04 -0700	[thread overview]
Message-ID: <20200723223004.9586-7-rcampbell@nvidia.com> (raw)
In-Reply-To: <20200723223004.9586-1-rcampbell-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

When migrating the special zero page, migrate_vma_pages() calls
mmu_notifier_invalidate_range_start() before replacing the zero page
PFN in the CPU page tables. This is unnecessary since the range was
invalidated in migrate_vma_setup() and the page table entry is checked
to be sure it hasn't changed between migrate_vma_setup() and
migrate_vma_pages(). Therefore, remove the redundant invalidation.
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1;
	t\x1595543388; bh=Y8qnSzc0udfc4m+P6cziRmRJk5XEGcgDU5ImloLrCuE=;
	h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer:
	 In-Reply-To:References:MIME-Version:X-NVConfidentiality:
	 Content-Transfer-Encoding:Content-Type;
	b=rIyLVqKU1Kxf67Qz9TIZ2f1lAaP7YxvFgCZR8v0Vw1fwq7aUbMbgfzcF0bd6+XzG6
	 ZHtBRMp/Zu/ZLGRxP6lBqZo4wHMHbuW3fXOvPCrYTD5YsCCLv+Ao4RmreWyec2wBTk
	 uBo3ZylCHJ0ckD85BcjQQxpXyY99cBsvIomZw9wzg6QGm7Ksbq6d+UKSkb0L04d6v8
	 fiRvvLNq3kCbPzrifaBTj3klQcVcKXz34km0XUoRQlSaftlq4BJWopBPX8U7gQtstO
	 OvA7Al9t87sCpKjSnqjE7N1jThU0KzjPrCxJiEHq/0Vf4sqeUA42bOkc+bk/CV1ZSF
	 n9jm36j4kRTUg=

Signed-off-by: Ralph Campbell <rcampbell-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 mm/migrate.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 96e1f41a991e..36076ba2f51a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2877,9 +2877,7 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 {
 	const unsigned long npages = migrate->npages;
 	const unsigned long start = migrate->start;
-	struct mmu_notifier_range range;
 	unsigned long addr, i;
-	bool notified = false;
 
 	for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
 		struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
@@ -2895,16 +2893,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (!page) {
 			if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
 				continue;
-			if (!notified) {
-				notified = true;
-
-				mmu_notifier_range_init(&range,
-							MMU_NOTIFY_CLEAR, 0,
-							NULL,
-							migrate->vma->vm_mm,
-							addr, migrate->end);
-				mmu_notifier_invalidate_range_start(&range);
-			}
 			migrate_vma_insert_page(migrate, addr, newpage,
 						&migrate->src[i],
 						&migrate->dst[i]);
@@ -2937,14 +2925,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (r != MIGRATEPAGE_SUCCESS)
 			migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
 	}
-
-	/*
-	 * No need to double call mmu_notifier->invalidate_range() callback as
-	 * the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
-	 * did already call it.
-	 */
-	if (notified)
-		mmu_notifier_invalidate_range_only_end(&range);
 }
 EXPORT_SYMBOL(migrate_vma_pages);
 
-- 
2.20.1

WARNING: multiple messages have this Message-ID (diff)
From: Ralph Campbell <rcampbell@nvidia.com>
To: linux-rdma@vger.kernel.org, linux-mm@kvack.org,
	nouveau@lists.freedesktop.org, kvm-ppc@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jerome Glisse <jglisse@redhat.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Christoph Hellwig <hch@lst.de>,
	Jason Gunthorpe <jgg@mellanox.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Shuah Khan <shuah@kernel.org>, Ben Skeggs <bskeggs@redhat.com>,
	Bharata B Rao <bharata@linux.ibm.com>,
	Ralph Campbell <rcampbell@nvidia.com>
Subject: [PATCH v4 6/6] mm/migrate: remove range invalidation in migrate_vma_pages()
Date: Thu, 23 Jul 2020 22:30:04 +0000	[thread overview]
Message-ID: <20200723223004.9586-7-rcampbell@nvidia.com> (raw)
In-Reply-To: <20200723223004.9586-1-rcampbell@nvidia.com>

When migrating the special zero page, migrate_vma_pages() calls
mmu_notifier_invalidate_range_start() before replacing the zero page
PFN in the CPU page tables. This is unnecessary since the range was
invalidated in migrate_vma_setup() and the page table entry is checked
to be sure it hasn't changed between migrate_vma_setup() and
migrate_vma_pages(). Therefore, remove the redundant invalidation.
DKIM-Signature: v\x01 aa-sha256; c\x0elaxed/relaxed; didia.com; s\x01;
	t\x1595543388; bh\bqnSzc0udfc4m+P6cziRmRJk5XEGcgDU5ImloLrCuE	hPGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer:
	 In-Reply-To:References:MIME-Version:X-NVConfidentiality:
	 Content-Transfer-Encoding:Content-Type;
	byLVqKU1Kxf67Qz9TIZ2f1lAaP7YxvFgCZR8v0Vw1fwq7aUbMbgfzcF0bd6+XzG6
	 ZHtBRMp/Zu/ZLGRxP6lBqZo4wHMHbuW3fXOvPCrYTD5YsCCLv+Ao4RmreWyec2wBTk
	 uBo3ZylCHJ0ckD85BcjQQxpXyY99cBsvIomZw9wzg6QGm7Ksbq6d+UKSkb0L04d6v8
	 fiRvvLNq3kCbPzrifaBTj3klQcVcKXz34km0XUoRQlSaftlq4BJWopBPX8U7gQtstO
	 OvA7Al9t87sCpKjSnqjE7N1jThU0KzjPrCxJiEHq/0Vf4sqeUA42bOkc+bk/CV1ZSF
	 n9jm36j4kRTUg
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
---
 mm/migrate.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 96e1f41a991e..36076ba2f51a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2877,9 +2877,7 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 {
 	const unsigned long npages = migrate->npages;
 	const unsigned long start = migrate->start;
-	struct mmu_notifier_range range;
 	unsigned long addr, i;
-	bool notified = false;
 
 	for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
 		struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
@@ -2895,16 +2893,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (!page) {
 			if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
 				continue;
-			if (!notified) {
-				notified = true;
-
-				mmu_notifier_range_init(&range,
-							MMU_NOTIFY_CLEAR, 0,
-							NULL,
-							migrate->vma->vm_mm,
-							addr, migrate->end);
-				mmu_notifier_invalidate_range_start(&range);
-			}
 			migrate_vma_insert_page(migrate, addr, newpage,
 						&migrate->src[i],
 						&migrate->dst[i]);
@@ -2937,14 +2925,6 @@ void migrate_vma_pages(struct migrate_vma *migrate)
 		if (r != MIGRATEPAGE_SUCCESS)
 			migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
 	}
-
-	/*
-	 * No need to double call mmu_notifier->invalidate_range() callback as
-	 * the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
-	 * did already call it.
-	 */
-	if (notified)
-		mmu_notifier_invalidate_range_only_end(&range);
 }
 EXPORT_SYMBOL(migrate_vma_pages);
 
-- 
2.20.1

  parent reply	other threads:[~2020-07-23 22:31 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23 22:29 [PATCH v4 0/6] mm/migrate: avoid device private invalidations Ralph Campbell
2020-07-23 22:29 ` Ralph Campbell
2020-07-23 22:29 ` Ralph Campbell
2020-07-23 22:29 ` [PATCH v4 1/6] nouveau: fix storing invalid ptes Ralph Campbell
2020-07-23 22:29   ` Ralph Campbell
2020-07-23 22:29   ` Ralph Campbell
2020-07-23 22:30 ` [PATCH v4 2/6] mm/migrate: add a flags parameter to migrate_vma Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30 ` [PATCH v4 3/6] mm/notifier: add migration invalidation type Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-28 19:15   ` Jason Gunthorpe
2020-07-28 19:15     ` Jason Gunthorpe
2020-07-28 19:15     ` Jason Gunthorpe
2020-07-28 20:57     ` Ralph Campbell
2020-07-28 20:57       ` Ralph Campbell
2020-07-28 20:57       ` Ralph Campbell
2020-07-23 22:30 ` [PATCH v4 4/6] nouveau/svm: use the new migration invalidation Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30 ` [PATCH v4 5/6] mm/hmm/test: " Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30 ` Ralph Campbell [this message]
2020-07-23 22:30   ` [PATCH v4 6/6] mm/migrate: remove range invalidation in migrate_vma_pages() Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-23 22:30   ` Ralph Campbell
2020-07-28 19:19   ` Jason Gunthorpe
2020-07-28 19:19     ` Jason Gunthorpe
2020-07-28 19:19     ` Jason Gunthorpe
2020-07-28 22:04     ` Ralph Campbell
2020-07-28 22:04       ` Ralph Campbell
2020-07-28 22:04       ` Ralph Campbell
2020-07-31 19:15       ` Jason Gunthorpe
2020-07-31 19:15         ` Jason Gunthorpe
2020-07-31 19:31         ` Ralph Campbell
2020-07-31 19:31           ` Ralph Campbell
2020-07-31 19:31           ` Ralph Campbell
2020-07-28 19:22 ` [PATCH v4 0/6] mm/migrate: avoid device private invalidations Jason Gunthorpe
2020-07-28 19:22   ` Jason Gunthorpe
2020-07-28 19:22   ` Jason Gunthorpe

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