| From: |
| Suren Baghdasaryan <surenb-AT-google.com> |
| To: |
| akpm-AT-linux-foundation.org |
| Subject: |
| [PATCH 0/3] execute PROCMAP_QUERY ioctl under per-vma lock |
| Date: |
| Thu, 31 Jul 2025 15:00:21 -0700 |
| Message-ID: |
| <20250731220024.702621-1-surenb@google.com> |
| Cc: |
| Liam.Howlett-AT-oracle.com, lorenzo.stoakes-AT-oracle.com, david-AT-redhat.com, vbabka-AT-suse.cz, peterx-AT-redhat.com, jannh-AT-google.com, hannes-AT-cmpxchg.org, mhocko-AT-kernel.org, paulmck-AT-kernel.org, shuah-AT-kernel.org, adobriyan-AT-gmail.com, brauner-AT-kernel.org, josef-AT-toxicpanda.com, yebin10-AT-huawei.com, linux-AT-weissschuh.net, willy-AT-infradead.org, osalvador-AT-suse.de, andrii-AT-kernel.org, ryan.roberts-AT-arm.com, christophe.leroy-AT-csgroup.eu, tjmercier-AT-google.com, kaleshsingh-AT-google.com, aha310510-AT-gmail.com, linux-kernel-AT-vger.kernel.org, linux-fsdevel-AT-vger.kernel.org, linux-mm-AT-kvack.org, linux-kselftest-AT-vger.kernel.org, surenb-AT-google.com |
| Archive-link: |
| Article |
With /proc/pid/maps now being read under per-vma lock protection we can
reuse parts of that code to execute PROCMAP_QUERY ioctl also without
taking mmap_lock. The change is designed to reduce mmap_lock contention
and prevent PROCMAP_QUERY ioctl calls from blocking address space updates.
This patchset was split out of the original patchset [1] that introduced
per-vma lock usage for /proc/pid/maps reading. It contains PROCMAP_QUERY
tests, code refactoring patch to simplify the main change and the actual
transition to per-vma lock.
[1] https://lore.kernel.org/all/20250704060727.724817-1-suren...
Suren Baghdasaryan (3):
selftests/proc: test PROCMAP_QUERY ioctl while vma is concurrently
modified
fs/proc/task_mmu: factor out proc_maps_private fields used by
PROCMAP_QUERY
fs/proc/task_mmu: execute PROCMAP_QUERY ioctl under per-vma locks
fs/proc/internal.h | 15 +-
fs/proc/task_mmu.c | 149 ++++++++++++------
tools/testing/selftests/proc/proc-maps-race.c | 65 ++++++++
3 files changed, 174 insertions(+), 55 deletions(-)
base-commit: 01da54f10fddf3b01c5a3b80f6b16bbad390c302
--
2.50.1.565.gc32cd1483b-goog
