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Thu, 25 Apr 2024 02:21:47 -0700 (PDT) MIME-Version: 1.0 From: Mounesh Badiger Date: Thu, 25 Apr 2024 14:51:35 +0530 Message-ID: Subject: kmalloc() question - migration/remap of kmalloc()'ed pages To: linux-mm@kvack.org Content-Type: multipart/alternative; boundary="000000000000fd64460616e85033" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 97E86180015 X-Stat-Signature: 31twrap1fsgr7shrxn4xqz8xcdxitkqn X-Rspam-User: X-HE-Tag: 1714036910-361370 X-HE-Meta: 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 QZ0Ye/ci 1sngs1dcppTKad0616b9h9BT55NbOf5my60pevlfj8vdvD3ekSdI/UOcJekeRx3QLIO3ukTjsfs2zKel50Liwx/jKkcmqs3OTmCfB X-Bogosity: Ham, tests=bogofilter, spamicity=0.075466, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --000000000000fd64460616e85033 Content-Type: text/plain; charset="UTF-8" Hi, We have a device driver that allocates physical pages using kmalloc() and these pages are mapped to the userspace process via mmap. Does the kmalloc()'ed memory mapped to userspace can migrate or get remapped due to any of kernel mm operations? we are looking to keep VA->PA mapping intact from a userspace process point of view. -- Mounesh Badiger Support for education Visit*: www.vidyaposhak.org * --000000000000fd64460616e85033 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

We have a device=C2=A0driver that allocates ph= ysical pages using kmalloc() and these pages are mapped to the userspace=C2= =A0process via mmap.=C2=A0

Does the kmalloc()'= ed memory mapped to userspace=C2=A0can migrate or get remapped due to any o= f kernel mm operations?

we are looking to keep VA-= >PA mapping intact from a userspace=C2=A0process=C2=A0point of view.=C2= =A0

--
Mounesh Badiger
S= upport for education
Visit: www.vidyaposhak.org
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