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>
Subject: [PATCH v2 11/14] gup: add FOLL_HINT_BULK, FAULT_FLAG_UNCACHED
Date: Wed, 20 Oct 2021 10:03:02 -0700 [thread overview]
Message-ID: <20211020170305.376118-12-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20211020170305.376118-1-ankur.a.arora@oracle.com>
Add FOLL_HINT_BULK, which users of get_user_pages(), and
pin_user_pages() can use to signal that this call is one of
many allowing get_user_pages() to optimize accordingly.
Also add FAULT_FLAG_UNCACHED, which translates to the
same idea for the fault path.
As the second flag suggests, the intent for both is to hint the
use of an uncached path if one is available.
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
include/linux/mm.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3e8ddec2aba2..cf1c711fe5ba 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -446,6 +446,7 @@ extern pgprot_t protection_map[16];
* @FAULT_FLAG_REMOTE: The fault is not for current task/mm.
* @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch.
* @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals.
+ * @FAULT_FLAG_UNCACHED: Fault handling to choose the uncached path.
*
* About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify
* whether we would allow page faults to retry by specifying these two
@@ -477,6 +478,7 @@ enum fault_flag {
FAULT_FLAG_REMOTE = 1 << 7,
FAULT_FLAG_INSTRUCTION = 1 << 8,
FAULT_FLAG_INTERRUPTIBLE = 1 << 9,
+ FAULT_FLAG_UNCACHED = 1 << 10,
};
/*
@@ -2864,6 +2866,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
#define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */
#define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */
#define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */
+#define FOLL_HINT_BULK 0x100000 /* part of a larger extent being gup'd */
/*
* FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each
--
2.29.2
next prev parent reply other threads:[~2021-10-20 17:06 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 ` Ankur Arora [this message]
2021-10-20 17:03 ` [PATCH v2 12/14] gup: use uncached path when clearing large regions Ankur Arora
2021-10-20 18:52 ` [PATCH v2 13/14] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages() Ankur Arora
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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