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[71.184.142.128]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-43fb17f69ddsm44981881cf.41.2024.05.28.12.00.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 May 2024 12:00:36 -0700 (PDT) From: Eric Chanudet To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Mike Rapoport , Andrew Morton , Baoquan He , Michael Ellerman , Nick Piggin Cc: x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Eric Chanudet Subject: [PATCH v3] mm/mm_init: use node's number of cpus in deferred_page_init_max_threads Date: Tue, 28 May 2024 14:54:58 -0400 Message-ID: <20240528185455.643227-4-echanude@redhat.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit When DEFERRED_STRUCT_PAGE_INIT=y, use a node's cpu count as maximum thread count for the deferred initialization of struct pages via padata. This should result in shorter boot times for these configurations by going through page_alloc_init_late() faster as systems tend not to be under heavy load that early in the bootstrap. Only x86_64 does that now. Make it archs agnostic when DEFERRED_STRUCT_PAGE_INIT is set. With the default defconfigs, that includes powerpc and s390. It used to be so before offering archs to override the function for tuning with commit ecd096506922 ("mm: make deferred init's max threads arch-specific"). Setting DEFERRED_STRUCT_PAGE_INIT and testing on a few arm64 platforms shows faster deferred_init_memmap completions: | | x13s | SA8775p-ride | Ampere R137-P31 | Ampere HR330 | | | Metal, 32GB | VM, 36GB | VM, 58GB | Metal, 128GB | | | 8cpus | 8cpus | 8cpus | 32cpus | |---------|-------------|--------------|-----------------|--------------| | threads | ms (%) | ms (%) | ms (%) | ms (%) | |---------|-------------|--------------|-----------------|--------------| | 1 | 108 (0%) | 72 (0%) | 224 (0%) | 324 (0%) | | cpus | 24 (-77%) | 36 (-50%) | 40 (-82%) | 56 (-82%) | Michael Ellerman on a powerpc machine (1TB, 40 cores, 4KB pages) reports faster deferred_init_memmap from 210-240ms to 90-110ms between nodes. Signed-off-by: Eric Chanudet Tested-by: Michael Ellerman (powerpc) --- - v1: https://lore.kernel.org/linux-arm-kernel/20240520231555.395979-5-echanude@redhat.com - Changes since v1: - Make the generic function return the number of cpus of the node as max threads limit instead overriding it for arm64. - Drop Baoquan He's R-b on v1 since the logic changed. - Add CCs according to patch changes (ppc and s390 set DEFERRED_STRUCT_PAGE_INIT by default). - v2: https://lore.kernel.org/linux-arm-kernel/20240522203758.626932-4-echanude@redhat.com/ - Changes since v2: - deferred_page_init_max_threads returns unsigned and use max instead of max_t. - Make deferred_page_init_max_threads static since there are no more override. - Rephrase description. - Add T-b and report from Michael Ellerman. arch/x86/mm/init_64.c | 12 ------------ include/linux/memblock.h | 2 -- mm/mm_init.c | 5 ++--- 3 files changed, 2 insertions(+), 17 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 7e177856ee4f..adec42928ec1 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1354,18 +1354,6 @@ void __init mem_init(void) preallocate_vmalloc_pages(); } -#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT -int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask) -{ - /* - * More CPUs always led to greater speedups on tested systems, up to - * all the nodes' CPUs. Use all since the system is otherwise idle - * now. - */ - return max_t(int, cpumask_weight(node_cpumask), 1); -} -#endif - int kernel_set_to_readonly; void mark_rodata_ro(void) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index e2082240586d..40c62aca36ec 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -335,8 +335,6 @@ void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone, for (; i != U64_MAX; \ __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) -int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask); - #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ /** diff --git a/mm/mm_init.c b/mm/mm_init.c index f72b852bd5b8..acfeba508796 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2122,11 +2122,10 @@ deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn, } } -/* An arch may override for more concurrency. */ -__weak int __init +static unsigned int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask) { - return 1; + return max(cpumask_weight(node_cpumask), 1U); } /* Initialise remaining memory on a node */ -- 2.44.0