[Bug 277476] graphics/drm-515-kmod: amdgpu periodic hangs due to phys contig allocations

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277476

--- Comment #33 from [email protected] ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=d738ed04dbff78243617ac341486b86486e9c8be

commit d738ed04dbff78243617ac341486b86486e9c8be
Author:     Olivier Certner <[email protected]>
AuthorDate: 2025-07-07 12:27:48 +0000
Commit:     Olivier Certner <[email protected]>
CommitDate: 2025-07-28 13:28:49 +0000

    LinuxKPI: alloc_pages(): Don't reclaim on __GFP_NORETRY

    Pass VM_ALLOC_NORECLAIM to vm_page_alloc_noobj_contig() so that it
    avoids reclaiming (currently, calling vm_reserv_reclaim_contig()).

    According to Linux's documentation, __GFP_NORETRY should not cause any
    "disruptive reclaim".  alloc_pages() is called a lot from the amdgpu DRM
    driver via ttm_pool_alloc(), which tries to allocate pages of the
    highest order first and fallback to lower order pages (as allocating
    contiguous physical pages is in fact not a requirement).  This process
    relies on failing fast, as requested by __GFP_NORETRY.  See also related
    commit 718d1928f874 ("LinuxKPI: make linux_alloc_pages() honor
    __GFP_NORETRY").

    Reviewed by:    jeffpc_josefsipek.net, bz
    MFC after:      10 days
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D51246

    (cherry picked from commit 4ca9190251bbd00c928a3cba54712c3ec25e9e26)

    Forgotten on commit to main/-CURRENT:
    PR:             277476

 sys/compat/linuxkpi/common/src/linux_page.c | 5 +++++
 1 file changed, 5 insertions(+)

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