Messages in this thread |  | | From | "H.J. Lu" <> | | Date | Sat, 11 Apr 2026 08:12:32 +0800 | | Subject | Re: Avoid reading /sys/kernel/mm/transparent_hugepage/? |
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On Fri, Apr 10, 2026 at 4:35 PM Alexey Dobriyan <adobriyan@gmail.com> wrote: > > On Fri, Apr 10, 2026 at 03:40:30PM +0800, H.J. Lu wrote: > > On Fri, Apr 10, 2026 at 3:28 PM Florian Weimer <fweimer@redhat.com> wrote: > > > > > > * H. J. Lu: > > > > > > > To enable THP segment load, ld.so opens and reads 2 files under > > > > /sys/kernel/mm/transparent_hugepage/. This requires mounting > > > > /sys and is expensive. Is it possible to put such info in vDSO? > > > > > > Alexey Dobriyan proposed adding AT_PAGE_SHIFT_LIST to the auxiliary > > > > Does it cover > > > > [hjl@gnu-tgl-3 linux]$ cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size > > 2097152 > > [hjl@gnu-tgl-3 linux]$ > > > > > vector a while back, but I don't know the status of that. > > Status: nothing happened. > > > How can we get > > > > [hjl@gnu-tgl-3 linux]$ cat /sys/kernel/mm/transparent_hugepage/enabled > > always [madvise] never > > [hjl@gnu-tgl-3 linux]$ > > This is not covered, see the link: > https://lore.kernel.org/lkml/ecb049aa-bcac-45c7-bbb1-4612d094935a@p183/ > > PAGE_SHIFT_MASK should be folded into system call probably.
We need a fast way to check THP status for THP segment load. A system call to return /sys/kernel/mm/transparent_hugepage/enabled and /sys/kernel/mm/transparent_hugepage/hpage_pmd_size should work.
-- H.J.
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