Date: Thu, 08 Jan 2026 09:09:29 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 292265] shm_create_largepage() does not appear to allocate large pages Message-ID: <bug-292265-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292265 Bug ID: 292265 Summary: shm_create_largepage() does not appear to allocate large pages Product: Base System Version: 15.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: cryintothebluesky@gmail.com Attachment #266931 text/plain mime type: Created attachment 266931 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=266931&action=edit Test program to reproduce the issue I have a test program which allocates 4 GiB shared memory segment and attempts to use shm_create_largepage() with 2 MiB pages. The expectation is that 2048 large pages would be allocated, however procstat reports many more pages, suggesting that smaller 4 KiB pages are used instead. procstat vm $(pgrep test_large_pages) ... PID START END PRT RES PRES REF SHD FLAG TP PATH 38528 0x822e00000 0x922e00000 rw- 1048576 1048576 2 0 ----- ph posixshm@anon Number of pages allocated is way more than the expected 2048 I'm not sure if this is a bug in shm_create_largepage() or incorrect procstat page counters. -- You are receiving this mail because: You are the assignee for the bug.home | help
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