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[2003:d8:2f49:bc00:12fa:1681:c754:1630]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c4533e6sm28362386f8f.35.2025.08.07.11.31.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Aug 2025 11:31:20 -0700 (PDT) Message-ID: Date: Thu, 7 Aug 2025 20:31:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [mm] f822a9a81a: stress-ng.bigheap.realloc_calls_per_sec 37.3% regression To: Jann Horn Cc: Lorenzo Stoakes , kernel test robot , Dev Jain , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Andrew Morton , Barry Song , Pedro Falcato , Anshuman Khandual , Bang Li , Baolin Wang , bibo mao , Hugh Dickins , Ingo Molnar , Lance Yang , Liam Howlett , Matthew Wilcox , Peter Xu , Qi Zheng , Ryan Roberts , Vlastimil Babka , Yang Shi , Zi Yan , linux-mm@kvack.org References: <202508071609.4e743d7c-lkp@intel.com> <9e3a59b2-11c0-43ca-aff3-414091f04aa4@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 6AD888000B X-Rspam-User: X-Rspamd-Server: rspam09 X-Stat-Signature: imr87ukrq7eqgfzhxzasj6i4rkc7pxh1 X-HE-Tag: 1754591484-861254 X-HE-Meta: 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 YrREvXmS 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 07.08.25 20:07, Jann Horn wrote: > On Thu, Aug 7, 2025 at 8:02 PM David Hildenbrand wrote: >> Sure, we could use pte_batch_hint(), but I'm curious if x86 would also >> benefit with larger folios (e.g., 64K, 128K) with this patch. > > Where would you expect such a benefit to come from? This function is > more or less a memcpy(), except it has to read PTEs with xchg(), write > them atomically, and set softdirty flags. For x86, what the associated > folios look like and whether the PTEs are contiguous shouldn't matter. > Good point, I was assuming TLB flushing as well, but that doesn't really apply here because we are already batching that. -- Cheers, David / dhildenb