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spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: =E5=9C=A8 2025/4/22 16:30, Ingo Molnar =E5=86=99=E9=81=93: >=20 > * Borislav Petkov wrote: >=20 >> On Fri, Apr 18, 2025 at 08:31:23PM +0930, Qu Wenruo wrote: >>> Hi, >>> >>> Recently I'm testing a situation where highmem is involved, thus I'm >>> building the latest 32bit x86 with HIGHMEM and PAE, and run it inside = a qemu >>> VM. >> >> Does that fix it: >> >> https://git.kernel.org/tip/1e07b9fad022e0e02215150ca1e20912e78e8ec1 >> >> ? >=20 > That commit caused other problems - the best fix we have right now is: >=20 > https://git.kernel.org/tip/83b2d345e1786fdab96fc2b52942eebde125e7cd Thanks, I'll take a try again. But considering how rare 32bit + highmem systems are nowadays, I still=20 have one questions/concern: - How to make sure we really got highmems? The kernel docs only mention that highmems need temporary mapping, and proper kmap/kunmap() handling. But I still didn't have a straightforward idea of how to verify, without adding manual ftrace events when a highmem page is hit. E.g. free only shows 3GB memory even if I enabled highmem + PAE. Since HIGHMEM64G is removed, I'd expect to get some values more like 4G instead? Thanks, Qu >=20 > Thanks, >=20 > Ingo