Re: [PATCH RFC v2 00/15] mm/mglru: frequency guided promotion (MGLRU-FG) and flag cleanup

[Kairui Song]

On Wed, Sep 16, 2026 at 3:43 PM zhaozhengzhuo
<zhaozhengzhuo@xxxxxxxxxxxxx> wrote:
>
> Hi Kairui,
>
> Following up on my earlier v1 test report [1], I tested the complete v2
> series on a small WSL2 box. Applied on the stated base-commit
> 9958290885035431e2494159f555e332c3c14906 (mm-new): all 15 patches
> applied with git am, zero conflicts, and the resulting diffstat matches
> the cover letter exactly (20 files, +812/-499).
>
> Environment
> ===========
> WSL2 VM on a 32G Windows host, 12 CPUs, deepin 23 userspace, swap on an
> NVMe-backed virtual disk. VM memory was 15G/4G swap for the kernel
> build, fio and sqlite-grep runs, and 20G/8G for the DB and browser
> workloads. The distro WSL kernel ships without CONFIG_LRU_GEN, so both
> kernels were built from the distro config plus CONFIG_LRU_GEN=y +
> CONFIG_LRU_GEN_ENABLED=y; the two kernel configs differ only in
> LOCALVERSION. MGLRU was toggled at runtime via
> /sys/kernel/mm/lru_gen/enabled for the CLRU/MGLRU split, as in your own
> harness. Workloads were scaled proportionally to this smaller box as
> noted below.
>
> In summary: no After-vs-Before regression anywhere in my matrix, clear
> wins on fio miss rate, Chromium&Node and sqlite hot-path stability,
> both MGLRU modes consistently ahead of CLRU, and classical LRU
> untouched (MGLRU-off runs agree across the two kernels within <1% on
> every metric). Both kernels survived ~8h of heavy memory pressure with
> zero panics/BUGs/warnings. One caveat: your +13.4% MongoDB gain did not
> reproduce at my scaled 12-thread setup (+0.7%), but no regression
> either. Android was not tested (no real device here).

...

>
> Tested-by: zhaozhengzhuo <zhaozhengzhuo@xxxxxxxxxxxxx>

Thanks!

Glad to see this is working well for desktop and smaller devices, most
of the cases here are for large servers this time, with fast storage
and maybe WSL has double caching of files (not an expert on that) the
effect of LRU is limited. The result still looks good, which is good
news.

I tested Android and deployed it on my desktop look alright on my side too.

> Thanks,
> zhaozhengzhuo
>
> [1] https://lore.kernel.org/linux-mm/92DCEFFD13221261+20260828102344.1537874-1-zhaozhengzhuo@xxxxxxxxxxxxx/
> [2] https://github.com/brianfrankcooper/YCSB/blob/master/workloads/workloadb
> [3] https://lore.kernel.org/all/20221220214923.1229538-1-yuzhao@xxxxxxxxxx/
> [4] https://dl.acm.org/doi/10.1145/3731569.3764820 (artifact: https://github.com/cache-ext/cache_ext)
> [5] https://github.com/ryncsn/emm-test-project/tree/master/sqlite-grep