From: Ankur Arora <ankur.a.arora@oracle.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Cc: mingo@kernel.org, bp@alien8.de, luto@kernel.org,
akpm@linux-foundation.org, mike.kravetz@oracle.com,
jon.grimm@amd.com, kvm@vger.kernel.org, konrad.wilk@oracle.com,
boris.ostrovsky@oracle.com,
Ankur Arora <ankur.a.arora@oracle.com>,
alex.williamson@redhat.com
Subject: [PATCH v2 13/14] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages()
Date: Wed, 20 Oct 2021 11:52:07 -0700 [thread overview]
Message-ID: <20211020185207.18509-1-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20211020170305.376118-1-ankur.a.arora@oracle.com>
Specify FOLL_HINT_BULK to pin_user_pages() so it is aware that
this pin is part of a larger region being pinned, so it can
optimize based on that expectation.
Cc: alex.williamson@redhat.com
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
drivers/vfio/vfio_iommu_type1.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0e9217687f5c..0d45b0c6464d 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -557,6 +557,9 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
if (prot & IOMMU_WRITE)
flags |= FOLL_WRITE;
+ /* Tell gup that this iterations is part of larger set of pins. */
+ flags |= FOLL_HINT_BULK;
+
mmap_read_lock(mm);
ret = pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM,
pages, NULL, NULL);
--
2.29.2
next prev parent reply other threads:[~2021-10-20 18:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-20 17:02 [PATCH v2 00/14] Use uncached stores while clearing huge pages Ankur Arora
2021-10-20 17:02 ` [PATCH v2 01/14] x86/asm: add memset_movnti() Ankur Arora
2021-10-20 17:02 ` [PATCH v2 02/14] perf bench: " Ankur Arora
2021-10-20 17:02 ` [PATCH v2 03/14] x86/asm: add uncached page clearing Ankur Arora
2021-10-20 17:02 ` [PATCH v2 04/14] x86/asm: add clzero based " Ankur Arora
2021-10-20 17:02 ` [PATCH v2 05/14] x86/cpuid: add X86_FEATURE_MOVNT_SLOW Ankur Arora
2021-10-20 17:02 ` [PATCH v2 06/14] sparse: add address_space __incoherent Ankur Arora
2021-10-20 17:02 ` [PATCH v2 07/14] x86/clear_page: add clear_page_uncached() Ankur Arora
2021-12-08 8:58 ` Yu Xu
2021-12-10 4:37 ` Ankur Arora
2021-12-10 4:48 ` Yu Xu
2021-12-10 14:26 ` Ankur Arora
2021-10-20 17:02 ` [PATCH v2 08/14] mm/clear_page: add clear_page_uncached_threshold() Ankur Arora
2021-10-20 17:03 ` [PATCH v2 09/14] x86/clear_page: add arch_clear_page_uncached_threshold() Ankur Arora
2021-10-20 17:03 ` [PATCH v2 10/14] clear_huge_page: use uncached path Ankur Arora
2021-10-20 17:03 ` [PATCH v2 11/14] gup: add FOLL_HINT_BULK, FAULT_FLAG_UNCACHED Ankur Arora
2021-10-20 17:03 ` [PATCH v2 12/14] gup: use uncached path when clearing large regions Ankur Arora
2021-10-20 18:52 ` Ankur Arora [this message]
2021-10-20 18:52 ` [PATCH v2 14/14] x86/cpu/intel: set X86_FEATURE_MOVNT_SLOW for Skylake Ankur Arora
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