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b=YWteguSBNDf2N2WtMJCVXbbeG6ArWQ1dKYNjCkbvP1YEFEELcNmOlYA1ZQTUShnSD 2E8WsyGkkJ51XhKasVhJStI9snDN7kIdexgnRJIbi7/tKqPfUftKK+7CHYAr+ciWOX CU6I4xU3q6nolZ4poCda9bLihmDRNxJI7KKZoY/+UhNjguI/xou7vYnqlR5BxqMOhd wxUi3MlBJt8NDHW24TXf/hc6mVUFnHT1m2+ej7Z5M1OIdGImE759XivwynmL3prw4z WORP39Y6GVr06VX/V0GgmLDpFcj+5Aa6TDTCR4Y+9XReqrUwEsR77Bxa7llaMrLn/Z r9FuqkbkgLVdg== Date: Mon, 3 Aug 2026 12:26:55 +0000 From: Harry Yoo To: "Vlastimil Babka (SUSE)" Cc: paulmck@kernel.org, Andrew Morton , Hao Li , Uladzislau Rezki , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/slab: stop exporting kvfree_rcu_barrier[_on_cache]() Message-ID: References: <20260730-unexport-barriers-v1-1-852f6641abe9@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: A28A940009 X-Stat-Signature: 1okafazb1esq1kdnezty8np4c8yjr4cp X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1785760018-791031 X-HE-Meta: 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 g2/fXX/h WKwp5zGGAXd+LQt+clxFlrEVtMCBjaBbAIBu1nnRxNXkrFIRpQSuYcyoGY/29ubgqy8mD/Ofp/z/+6DmPnASadRuRBA8XZGI6vXfCDxioJiAejEKQRLFjy4W8cxA62jX5X9iowz5Ca8nzek/zzku7xLA95/rN0WUIVxzOESuRUiX5OM5xG/QFD1W6ujIdPpJXPLb5EbsWh9Pi2jpibanE67aJB4WrknxmkPOib8IczLxyxv468Zxln6tWEyl4TSbH/y28m25Zso2Cw7YYW2owZK6Y0gIkiopcDtPNs+vrhJ7Cw94= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 03, 2026 at 09:59:44AM +0200, Vlastimil Babka (SUSE) wrote: > On 7/30/26 22:59, Paul E. McKenney wrote: > > On Thu, Jul 30, 2026 at 04:32:46PM +0200, Vlastimil Babka (SUSE) wrote: > > Which reminds me... Are you guys interested in taking the kfree_rcu() > > test code from kernel/rcu/rcuscale.c? See for example the kfree_rcu_test > > module parameter. > > Hmm, we have a slub kunit test, but I think no such torture/scaling test > infra. Maybe once we have that? What do you think, Harry? That'd be definitely useful. We have been reviving performance tests every time we wondered if it'd affect performance in a surprising way. But we've never put that in the mainline ;) Probably test_kmalloc_nolock_and_friends*() don't even belong slub_kunit. Perhaps worth starting small with lib/test_slab.c, and slowly move/add torture/scaling tests to there? -- Cheers, Harry / Hyeonggon