[PATCH v1 0/5] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory

From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, David Hildenbrand <david@redhat.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Chris Zankel <chris@zankel.net>,
	Dave Hansen <dave.hansen@intel.com>, Helge Deller <deller@gmx.de>,
	Hugh Dickins <hughd@google.com>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Jann Horn <jannh@google.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Linux API <linux-api@vger.kernel.org>,
	"Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Matt Turner <mattst88@gmail.com>,
	Max Filippov <jcmvbkbc@gmail.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Michal Hocko <mhocko@suse.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Minchan Kim <minchan@kernel.org>,
	Oscar Salvador <osalvador@suse.de>, Peter Xu <peterx@redhat.com>,
	Ram Pai <linuxram@us.ibm.com>,
	Richard Henderson <rth@twiddle.net>,
	Rik van Riel <riel@surriel.com>,
	Rolf Eike Beer <eike-kernel@sf-tec.de>,
	Shuah Khan <shuah@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH v1 0/5] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory
Date: Wed, 17 Mar 2021 12:06:39 +0100	[thread overview]
Message-ID: <20210317110644.25343-1-david@redhat.com> (raw)

Excessive details on MADV_POPULATE_(READ|WRITE) can be found in patch #2.

Now accompanied by minor adjustments and selftests/vm tests.

RFCv2 -> v1
- "mm: fix variable name in declaration of populate_vma_page_range()"
-- Added
- "mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault ..."
-- Fix detection of memory holes when we have to re-lookup the VMA
-- Return -EHWPOISON to user space when we hit HW poisoned pages
-- Make variable names in definition and declaration consistent
- "MAINTAINERS: add tools/testing/selftests/vm/ to MEMORY MANAGEMENT"
-- Added
- "selftests/vm: add protection_keys_32 / protection_keys_64 to gitignore"
-- Added
- "selftests/vm: add test for MADV_POPULATE_(READ|WRITE)"
-- Added

RFC -> RFCv2:
- Fix re-locking (-> set "locked = 1;")
- Don't mimic MAP_POPULATE semantics:
--> Explicit READ/WRITE request instead of selecting it automatically,
    which makes it more generic and better suited for some use cases (e.g., we
    usually want to prefault shmem writable)
--> Require proper access permissions
- Introduce and use faultin_vma_page_range()
--> Properly handle HWPOISON pages (FOLL_HWPOISON)
--> Require proper access permissions (!FOLL_FORCE)
- Let faultin_vma_page_range() check for compatible mappings/permissions
- Extend patch description and add some performance numbers

David Hildenbrand (5):
  mm: make variable names for populate_vma_page_range() consistent
  mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc
    memory
  MAINTAINERS: add tools/testing/selftests/vm/ to MEMORY MANAGEMENT
  selftests/vm: add protection_keys_32 / protection_keys_64 to gitignore
  selftests/vm: add test for MADV_POPULATE_(READ|WRITE)

 MAINTAINERS                                |   1 +
 arch/alpha/include/uapi/asm/mman.h         |   3 +
 arch/mips/include/uapi/asm/mman.h          |   3 +
 arch/parisc/include/uapi/asm/mman.h        |   3 +
 arch/xtensa/include/uapi/asm/mman.h        |   3 +
 include/uapi/asm-generic/mman-common.h     |   3 +
 mm/gup.c                                   |  54 ++++
 mm/internal.h                              |   5 +-
 mm/madvise.c                               |  69 +++++
 tools/testing/selftests/vm/.gitignore      |   3 +
 tools/testing/selftests/vm/Makefile        |   1 +
 tools/testing/selftests/vm/madv_populate.c | 342 +++++++++++++++++++++
 tools/testing/selftests/vm/run_vmtests.sh  |  16 +
 13 files changed, 505 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/vm/madv_populate.c

-- 
2.29.2