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Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Jerome Glisse , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka Subject: [PATCH 13/28] mm/gup: Expose mm_populate_vma() for use when the vma is known Date: Thu, 10 Dec 2020 12:03:47 -0500 Message-Id: <20201210170402.3468568-14-Liam.Howlett@Oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201210170402.3468568-1-Liam.Howlett@Oracle.com> References: <20201210170402.3468568-1-Liam.Howlett@Oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9830 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=872 suspectscore=0 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012100106 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9830 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=887 clxscore=1015 malwarescore=0 bulkscore=0 phishscore=0 adultscore=0 spamscore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012100106 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When a vma is known, avoid calling mm_populate to search for the vma to populate. Signed-off-by: Liam R. Howlett --- include/linux/mm.h | 4 ++++ mm/gup.c | 20 ++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1bfa2ee41187d..6cc8825f26414 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2587,8 +2587,12 @@ static inline void mm_populate(unsigned long addr,= unsigned long len) /* Ignore errors */ (void) __mm_populate(addr, len, 1); } +extern void mm_populate_vma(struct vm_area_struct *vma, unsigned long st= art, + unsigned long end); #else static inline void mm_populate(unsigned long addr, unsigned long len) {} +void mm_populate_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end) {} #endif =20 /* These take the mm semaphore themselves */ diff --git a/mm/gup.c b/mm/gup.c index 102877ed77a4b..522f8fd491ead 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1431,6 +1431,26 @@ long populate_vma_page_range(struct vm_area_struct= *vma, NULL, NULL, locked); } =20 +/* + * mm_populate_vma() - Populate a single range in a single vma. + * @vma: The vma to populate. + * @start: The start address to populate + * @end: The end address to stop populating + * + * Note: Ignores errors. + */ +void mm_populate_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end) +{ + struct mm_struct *mm =3D current->mm; + int locked =3D 1; + + mmap_read_lock(mm); + populate_vma_page_range(vma, start, end, &locked); + if (locked) + mmap_read_unlock(mm); +} + /* * __mm_populate - populate and/or mlock pages within a range of address= space. * --=20 2.28.0