[TLDR: This mail in primarily relevant for Linux kernel regression tracking. See link in footer if these mails annoy you.] On 23.11.23 15:34, Liam R. Howlett wrote: > * Bagas Sanjaya <bagasdotme@xxxxxxxxx> [231123 00:07]: >> On Wed, Nov 22, 2023 at 08:03:19PM +0000, Chun Ng wrote: >>> >>> Recently I observed there is performance regression on system call mmap(..). I tried both vanilla kernels and Raspberry Pi kernels on a Raspberry Pi 4 box and the results are pretty consistent among them. >>> >>> Bisection showed that the regression starts from k-6.1, and the latest vanilla k-6.7 is still showing the same regression. > > This is almost certainly the maple tree. The tree is slower on writes > than the rbtree and so if the benchmark mmaps/munmaps in a tight loop > you will see this slow down. [...] > >> Anyway, I'm adding this regression to regzbot: >> #regzbot ^introduced: v6.0..v6.1 Liam, many thx for your reply. I known that you are still working on optimizing things in this area again, so I don't think this is worth tracking this as a regression: that doesn't buy us much afaics. And it might not be a regression at all anyway (not totally sure, didn't look into the details due to the former aspect; sounded a bit like the problem only can be seen in a microbenchmark; whatever). #regzbot resolve: not worth tracking Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.
