Re: [PATCH v3 2/4] mm: kick writeback flusher for IOCB_DONTCACHE with targeted dirty tracking

[Matthew Wilcox]

On Sun, Apr 26, 2026 at 07:56:08AM -0400, Jeff Layton wrote:
>   Mixed-mode noisy neighbor (dontcache writer + buffered readers):
>                        baseline    patched     change
>   writer (MB/s)         1297.6     1471.1     +13.4%
>   readers avg (MB/s)     855.0      462.4     -45.9%

hm.  This wasn't what I thought of when I thought of "noisy neighbour".
I'd have process A doing DONTCACHE writes to file A and process B doing
normal buffered writes to file B.