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a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=kLWA3gBXtu5QbDPQ:21 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=GoEa3M9JfhUA:10 a=9pbvY709o8pVKMR9FcoA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODE5MDEzNiBTYWx0ZWRfX508TZ27RDZmt h+uSS1wjKHAyvf1moO66/ndX1+U7GvMf3V4UYX2e4PcTmbjFRWxdrn7g2pXqlxiGWeRthCIlE+S 3beUSrweYbBMU8/YE6C43rxgQoabjkNSudg6z2dMhuKY/+xFmyVJPy0U1GwSNcyeJSvQlORrlxG G5DxoqYAeL4WjTLWHp6Hx9J6Mu67Z2tXeJp8DoiPLcKRmb9Qco28Pwj4ekJ62W0jEsV7D/gBNNq fA7iaB84FN1hphS3ZUb4nonWNN1TzIPFv91tEvTInAROzi/+QB470PzpAA70CmKAZg1fvXOa8m6 iLvlV0xdY3D0bTNWgDMvr+aXpYz14by5IRGXCXSIGeS+Jc5y5bx7HtyLHTII7KM3JyQbHeNd909 iZm8Jo51r/enOyDfasgwpYdGl9CbF7lS7ZtN52SKNOb0ShtjmIweQje6n/tNoBQ7cbPSUsXi X-Proofpoint-ORIG-GUID: Is3YVcH6UIPl8vvlw-pPUi4_ynLyuGhl On 19/08/2025 14:39, Christoph Hellwig wrote: > On Tue, Aug 19, 2025 at 12:42:01PM +0100, John Garry wrote: >> nothing has been happening on this thread for a while. I figure that it is >> because we have no good or obvious options. >> >> I think that it's better deal with the NVMe driver handling of AWUPF first, >> as this applies to block fops as well. >> >> As for the suggestion to have an opt-in to use AWUPF, you wrote above that >> users may not know when to enable this opt-in or not. >> >> It seems to me that we can give the option, but clearly label that it is >> potentially dangerous. Hopefully the $RANDOMUSER with the $CHEAPO SSD will >> be wise and steer clear. >> >> If we always ignore AWUPF, I fear that lots of sound NVMe implementations >> will be excluded from HW atomics. > > I think ignoring AWUPF is a good idea, but I've also hard some folks > not liking that. Disabling reading AWUPF would be the best way to know that for sure :) > > The reason why I prefer a mount option is because we add that to fstab > and the kernel command line easily. For block layer or driver options > we'd either need a sysfs file which is always annoying to apply at boot > time, Could system-udev auto enable for us via sysfs file or ioctl? > or a module option which has the downside of applying to all > devices. About the mount option, I suppose that it won't do much harm - it's just a bit of extra work to configure. I just fear that admins will miss enabling it or not enable it out of doubt and users won't see the benefit of HW atomics.