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FfxevYq/LfCpHpMiProFIFLqVLWzwp4dprnD/spaIW9TzOIGx5ofgKSr5tJoM7tbr3FNhg5Ubn8kllgbzVR4agT630EBphltFuQ1rlALJv6TDQvKXJCB7fFZ/c4u69gLOsXrfgGlO6jIgVGNCHw1RZu7XzMg+aCJ7gaZhc7zry6xIKIvzo96ENlsmJ+Xdsm0ZjRGcah5BVjmh0I4F4wFhpgFrNw/5WX5Ii6IfZQmbB6V74N+0XkSp9/hEie1WU1eZDzJAi7s0t3FS/Hz6oC92DaZw/UMnQOrUt/Eq7PdJqvmispJhF/ABeFXYk7Bza+PDCPcYm3FkaeoT8VBZDUqE+V70Epru00bVR+FmjE52BpnA4+ErjKYn5TKsBTJK/nKoeH6+ALJZIPGQdLM= 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 2023/12/21 12:49, Matthew Wilcox wrote: > On Thu, Dec 21, 2023 at 08:58:42AM +0800, Yin Fengwei wrote: >> Yes. MAP_STACK is also mentioned in manpage of mmap. I did test to >> filter out of the MAP_STACK mapping based on this patch. The regression >> in stress-ng.pthread was gone. I suppose this is kind of safe because >> the madvise call is only applied to glibc allocated stack. >> >> >> But what I am not sure was whether it's worthy to do such kind of change >> as the regression only is seen obviously in micro-benchmark. No evidence >> showed the other regressionsin this report is related with madvise. At >> least from the perf statstics. Need to check more on stream/ramspeed. > > FWIW, we had a customer report a significant performance problem when > inadvertently using 2MB pages for stacks. They were able to avoid it by > using 2044KiB sized stacks ... Looks like related with this regression. So we may need to consider avoiding THP for stack. Regards Yin, Fengwei