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Mon, 13 Apr 2026 15:39:53 -0700 (PDT) Sender: Minchan Kim From: Minchan Kim To: akpm@linux-foundation.org Cc: david@kernel.org, mhocko@suse.com, brauner@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, surenb@google.com, timmurray@google.com, Minchan Kim Subject: [RFC 0/3] mm: process_mrelease: expedited reclaim and auto-kill support Date: Mon, 13 Apr 2026 15:39:45 -0700 Message-ID: <20260413223948.556351-1-minchan@kernel.org> X-Mailer: git-send-email 2.54.0.rc0.605.g598a273b03-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch series introduces optimizations to expedite memory reclamation in process_mrelease() and provides a secure, race-free "auto-kill" mechanism for efficient container shutdown and OOM handling. Currently, process_mrelease() unmaps pages but leaves clean file folios on the LRU list, relying on standard memory reclaim to eventually free them. Furthermore, requiring userspace to send a SIGKILL prior to invoking process_mrelease() introduces scheduling race conditions where the victim task may enter the exit path prematurely, bypassing expedited reclamation hooks. This series addresses these limitations in three logical steps. Patch #1: mm: process_mrelease: expedite clean file folio reclaim via mmu_gather Integrates clean file folio eviction directly into the low-level TLB batching (mmu_gather) infrastructure. Symmetrically truncates clean file folios alongside anonymous pages during the unmap loop. Patch #2: mm: process_mrelease: skip LRU movement for exclusive file folios Skips costly LRU marking (folio_mark_accessed) for exclusive file-backed folios undergoing process_mrelease reclaim. Perf profiling reveals that LRU movement accounts for ~55% of overhead during unmap. Patch #3: mm: process_mrelease: introduce PROCESS_MRELEASE_REAP_KILL flag Adds an auto-kill flag supporting atomic teardown. Utilizes a dedicated signal code (KILL_MRELEASE) to guarantee MMF_UNSTABLE is marked in the signal delivery path, preventing scheduling races. Minchan Kim (3): mm: process_mrelease: expedite clean file folio reclaim via mmu_gather mm: process_mrelease: skip LRU movement for exclusive file folios mm: process_mrelease: introduce PROCESS_MRELEASE_REAP_KILL flag arch/s390/include/asm/tlb.h | 2 +- include/linux/swap.h | 9 ++++++--- include/uapi/asm-generic/siginfo.h | 6 ++++++ include/uapi/linux/mman.h | 4 ++++ kernel/signal.c | 4 ++++ mm/memory.c | 13 ++++++++++++- mm/mmu_gather.c | 8 +++++--- mm/oom_kill.c | 20 +++++++++++++++++++- mm/swap_state.c | 19 +++++++++++++++++-- 9 files changed, 74 insertions(+), 11 deletions(-) -- 2.54.0.rc0.605.g598a273b03-goog