From: jglisse@redhat.com
To: linux-mm@kvack.org
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
"Jérôme Glisse" <jglisse@redhat.com>,
"Christian König" <christian.koenig@amd.com>,
"Jan Kara" <jack@suse.cz>,
"Felix Kuehling" <Felix.Kuehling@amd.com>,
"Jason Gunthorpe" <jgg@mellanox.com>,
"Matthew Wilcox" <mawilcox@microsoft.com>,
"Ross Zwisler" <zwisler@kernel.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Michal Hocko" <mhocko@kernel.org>,
"Ralph Campbell" <rcampbell@nvidia.com>,
"John Hubbard" <jhubbard@nvidia.com>,
kvm@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org,
"Arnd Bergmann" <arnd@arndb.de>
Subject: [PATCH v4 7/9] gpu/drm/amdgpu: optimize out the case when a range is updated to read only
Date: Wed, 23 Jan 2019 17:23:13 -0500 [thread overview]
Message-ID: <20190123222315.1122-8-jglisse@redhat.com> (raw)
In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com>
From: Jérôme Glisse <jglisse@redhat.com>
When range of virtual address is updated read only and corresponding
user ptr object are already read only it is pointless to do anything.
Optimize this case out.
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: kvm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-rdma@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index 3e6823fdd939..7880eda064cd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -294,6 +294,7 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
{
struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
struct interval_tree_node *it;
+ bool update_to_read_only;
unsigned long end;
/* notification is exclusive, but interval is inclusive */
@@ -302,6 +303,8 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
if (amdgpu_mn_read_lock(amn, range->blockable))
return -EAGAIN;
+ update_to_read_only = mmu_notifier_range_update_to_read_only(range);
+
it = interval_tree_iter_first(&amn->objects, range->start, end);
while (it) {
struct amdgpu_mn_node *node;
@@ -317,6 +320,16 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
list_for_each_entry(bo, &node->bos, mn_list) {
struct kgd_mem *mem = bo->kfd_bo;
+ bool read_only;
+
+ /*
+ * If it is already read only and we are updating to
+ * read only then we do not need to change anything.
+ * So save time and skip this one.
+ */
+ read_only = amdgpu_ttm_tt_is_readonly(bo->tbo.ttm);
+ if (update_to_read_only && read_only)
+ continue;
if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm,
range->start,
--
2.17.2
next prev parent reply other threads:[~2019-01-23 22:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-23 22:23 [PATCH v4 0/9] mmu notifier provide context informations jglisse
2019-01-23 22:23 ` [PATCH v4 1/9] mm/mmu_notifier: contextual information for event enums jglisse
2019-01-23 22:23 ` [PATCH v4 2/9] mm/mmu_notifier: contextual information for event triggering invalidation jglisse
2019-01-23 22:23 ` [PATCH v4 3/9] mm/mmu_notifier: use correct mmu_notifier events for each invalidation jglisse
2019-01-23 22:23 ` [PATCH v4 4/9] mm/mmu_notifier: pass down vma and reasons why mmu notifier is happening jglisse
2019-01-23 22:23 ` [PATCH v4 5/9] mm/mmu_notifier: mmu_notifier_range_update_to_read_only() helper jglisse
2019-01-23 22:23 ` [PATCH v4 6/9] gpu/drm/radeon: optimize out the case when a range is updated to read only jglisse
2019-01-23 22:23 ` jglisse [this message]
2019-01-23 22:23 ` [PATCH v4 8/9] gpu/drm/i915: " jglisse
2019-01-24 12:09 ` Joonas Lahtinen
2019-01-24 15:30 ` Jerome Glisse
[not found] ` <154877159986.4387.16328989441685542244@jlahtine-desk.ger.corp.intel.com>
2019-01-29 16:21 ` Jerome Glisse
2019-01-23 22:23 ` [PATCH v4 9/9] RDMA/umem_odp: " jglisse
2019-01-23 22:32 ` Jason Gunthorpe
2019-01-23 22:46 ` Jerome Glisse
2019-01-23 22:54 ` [PATCH v4 0/9] mmu notifier provide context informations Dan Williams
2019-01-23 23:04 ` Jerome Glisse
2019-01-24 0:00 ` Dan Williams
2019-01-31 16:10 ` Jerome Glisse
2019-01-31 19:55 ` Andrew Morton
2019-01-31 20:33 ` Jerome Glisse
2019-02-01 12:24 ` Christian König
2019-02-01 21:02 ` Jan Kara
2019-02-11 18:54 ` Jerome Glisse
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