From: Ankur Arora <ankur.a.arora@oracle.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org,
mike.kravetz@oracle.com, mingo@kernel.org, luto@kernel.org,
tglx@linutronix.de, bp@alien8.de, peterz@infradead.org,
ak@linux.intel.com, arnd@arndb.de, jgg@nvidia.com,
jon.grimm@amd.com, boris.ostrovsky@oracle.com,
konrad.wilk@oracle.com, joao.m.martins@oracle.com,
ankur.a.arora@oracle.com
Subject: [PATCH v3 18/21] gup: add FOLL_HINT_BULK, FAULT_FLAG_NON_CACHING
Date: Mon, 6 Jun 2022 20:37:22 +0000 [thread overview]
Message-ID: <20220606203725.1313715-14-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20220606202109.1306034-1-ankur.a.arora@oracle.com>
Add FOLL_HINT_BULK, which callers of get_user_pages(), pin_user_pages()
can use to signal that this call is one of many, allowing
get_user_pages() to optimize accordingly.
Additionally, add FAULT_FLAG_NON_CACHING, which in the fault handling
path signals that the underlying logic can use non-caching primitives.
This is a possible optimization for FOLL_HINT_BULK calls.
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
include/linux/mm.h | 1 +
include/linux/mm_types.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a9b0c1889348..dbd8b7344dfc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2941,6 +2941,7 @@ 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
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index b34ff2cdbc4f..287b3018c14d 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -824,6 +824,7 @@ typedef struct {
* mapped R/O.
* @FAULT_FLAG_ORIG_PTE_VALID: whether the fault has vmf->orig_pte cached.
* We should only access orig_pte if this flag set.
+ * @FAULT_FLAG_NON_CACHING: Avoid polluting the cache if possible.
*
* About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify
* whether we would allow page faults to retry by specifying these two
@@ -861,6 +862,7 @@ enum fault_flag {
FAULT_FLAG_INTERRUPTIBLE = 1 << 9,
FAULT_FLAG_UNSHARE = 1 << 10,
FAULT_FLAG_ORIG_PTE_VALID = 1 << 11,
+ FAULT_FLAG_NON_CACHING = 1 << 12,
};
typedef unsigned int __bitwise zap_flags_t;
--
2.31.1
next prev parent reply other threads:[~2022-06-06 20:46 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-06 20:20 [PATCH v3 00/21] huge page clearing optimizations Ankur Arora
2022-06-06 20:20 ` [PATCH v3 01/21] mm, huge-page: reorder arguments to process_huge_page() Ankur Arora
2022-06-06 20:20 ` [PATCH v3 02/21] mm, huge-page: refactor process_subpage() Ankur Arora
2022-06-06 20:20 ` [PATCH v3 03/21] clear_page: add generic clear_user_pages() Ankur Arora
2022-06-06 20:20 ` [PATCH v3 04/21] mm, clear_huge_page: support clear_user_pages() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 05/21] mm/huge_page: generalize process_huge_page() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 06/21] x86/clear_page: add clear_pages() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 07/21] x86/asm: add memset_movnti() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 08/21] perf bench: " Ankur Arora
2022-06-06 20:37 ` [PATCH v3 09/21] x86/asm: add clear_pages_movnt() Ankur Arora
2022-06-10 22:11 ` Noah Goldstein
2022-06-10 22:15 ` Noah Goldstein
2022-06-12 11:18 ` Ankur Arora
2022-06-06 20:37 ` [PATCH v3 10/21] x86/asm: add clear_pages_clzero() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 11/21] x86/cpuid: add X86_FEATURE_MOVNT_SLOW Ankur Arora
2022-06-06 20:37 ` [PATCH v3 12/21] sparse: add address_space __incoherent Ankur Arora
2022-06-06 20:37 ` [PATCH v3 13/21] clear_page: add generic clear_user_pages_incoherent() Ankur Arora
2022-06-08 0:01 ` Luc Van Oostenryck
2022-06-12 11:19 ` Ankur Arora
2022-06-06 20:37 ` [PATCH v3 14/21] x86/clear_page: add clear_pages_incoherent() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 15/21] mm/clear_page: add clear_page_non_caching_threshold() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 16/21] x86/clear_page: add arch_clear_page_non_caching_threshold() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 17/21] clear_huge_page: use non-cached clearing Ankur Arora
2022-06-06 20:37 ` Ankur Arora [this message]
2022-06-06 20:37 ` [PATCH v3 19/21] gup: hint non-caching if clearing large regions Ankur Arora
2022-06-06 20:37 ` [PATCH v3 20/21] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages() Ankur Arora
2022-06-06 20:37 ` [PATCH v3 21/21] x86/cpu/intel: set X86_FEATURE_MOVNT_SLOW for Skylake Ankur Arora
2022-06-06 21:53 ` [PATCH v3 00/21] huge page clearing optimizations Linus Torvalds
2022-06-07 15:08 ` Ankur Arora
2022-06-07 17:56 ` Linus Torvalds
2022-06-08 19:24 ` Ankur Arora
2022-06-08 19:39 ` Linus Torvalds
2022-06-08 20:21 ` Ankur Arora
2022-06-08 19:49 ` Matthew Wilcox
2022-06-08 19:51 ` Matthew Wilcox
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