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Tue, 09 Jun 2026 06:19:55 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: linux-mm@kvack.org Cc: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , David Hildenbrand , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Sayali Patil , "Ritesh Harjani (IBM)" Subject: [RFC 0/4] mm, swap: Enable THP SWAP for PowerPC Book3S64 Date: Tue, 9 Jun 2026 18:49:30 +0530 Message-ID: X-Mailer: git-send-email 2.50.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On PowerPC Book3S64, MMU is selected at runtime, so macros like PMD_SHIFT are effectively runtime variables in the Book3S64 code. THP swap code uses these macros for e.g. to size some of its array data structures based on PMD_ORDER. This patch series makes that usage dependent on the runtime variable. Sayali did some performance runs of this on Book3S64 with Radix and it gives 40-50% performance improvement. We also plan to run it with Hash, will soon update the results. Note that this patch series is based out of linux-next (next-20260608). Ritesh Harjani (IBM) (4): include/linux/swap.h: Remove unused leftovers mm, swap: make SWAPFILE_CLUSTER runtime mm, swap: make SWAP_NR_ORDERS runtime powerpc: Kconfig: Enable THP_SWAP on Book3S64 arch/powerpc/platforms/Kconfig.cputype | 1 + include/linux/swap.h | 17 +--- mm/swap.h | 5 +- mm/swap_table.h | 6 +- mm/swapfile.c | 132 ++++++++++++++++++------- 5 files changed, 106 insertions(+), 55 deletions(-) -- 2.39.5