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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1u9bNI-0000000EYYX-3jgk; Tue, 29 Apr 2025 03:11:12 +0000 Date: Tue, 29 Apr 2025 04:11:12 +0100 From: Matthew Wilcox To: Yafang Shao Cc: akpm@linux-foundation.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH 0/4] mm, bpf: BPF based THP adjustment Message-ID: References: <20250429024139.34365-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250429024139.34365-1-laoar.shao@gmail.com> X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 5FE5B10000D X-Rspam-User: X-Stat-Signature: ifc6y91szcft365dgmp7yrrt1afbcqqd X-HE-Tag: 1745896275-243745 X-HE-Meta: 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 BVqhnSRA DYWBQPWy34vtUBHF3u8ge+IPNJNY9KSX49UTg1X02fRl4wBmcBNYpQSogHQCmDji1TqAXm+we1mvqJK1SFT22+IaOml63pBjij8o+E+yGpDdvjWaihyaH3y5yH3n0uoDiO2q8YEbZyw0s/pDR8KXZpV9JVkkyjAiVPqZQoGaZPlYVGNBAXk+26QXD9swQu//Lc+YTJLvq55MPnOVv7I/VHigirG6tr5otu5hU+s18pIG15qpgHDWl3ZdEzmNHnl+IYBJRB4rsqHUZb3I5xvA67eypheod0ao8ZNeGA2H9uc3Uj7XFG+IBDCcdlYUgxnsOEAVk 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 Tue, Apr 29, 2025 at 10:41:35AM +0800, Yafang Shao wrote: > In our container environment, we aim to enable THP selectively—allowing > specific services to use it while restricting others. This approach is > driven by the following considerations: > > 1. Memory Fragmentation > THP can lead to increased memory fragmentation, so we want to limit its > use across services. What? That's precisely wrong. _not_ using THPs increases fragmentation.