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Hsp1blUOC6j+nAvxLlQtmYtkv+4wgNxXnG4B1HjIoJTU0CLemxB5tEspDgZqptzCmHecjWYWSXKG+hI9oYSiZ3IHTewQnCx0nG4RefxiByv4ERFwgkIah/R0u2tAo/qJoWCPjlgnsZvDSgr8RvifQokUzxhVBQLzGn3pHilBP/IIx5O9OozI2r1Vi5M4ohv2t0KEbBnKtz4cwqj8= 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 4/14/2025 12:35 PM, Ingo Molnar wrote: > > * Ankur Arora wrote: [...] >> Performance for preempt=none|voluntary remains unchanged. > > CONFIG_PREEMPT_VOLUNTARY=y is the default on a number of major > distributions, such as Ubuntu, and a lot of enterprise distro kernels - > and this patch does nothing for them, for no good reason. > > So could you please provide a sensible size granularity cutoff of 16MB > or so on non-preemptive kernels, instead of this weird build-time > all-or-nothing binary cutoff based on preemption modes? > Agree with Ingo here. We are too harsh on none and voluntary with this limit. At least 512KB size? I will try to see if I can get numbers for different sizes that does not interfere much with other workloads' perf. (in none/voluntary mode). - Raghu