Re: [PATCH] mm: shmem: fix too little space for tmpfs only fallback 4KB

[Andrew Morton]

On Mon,  8 Sep 2025 20:31:28 +0800 Vernon Yang <vernon2gm@xxxxxxxxx> wrote:

> From: Vernon Yang <yanglincheng@xxxxxxxxxx>
> 
> When the system memory is sufficient, allocating memory is always
> successful, but when tmpfs size is low (e.g. 1MB), it falls back
> directly from 2MB to 4KB, and other small granularity (8KB ~ 1024KB)
> will not be tried.
> 
> Therefore add check whether the remaining space of tmpfs is sufficient
> for allocation. If there is too little space left, try smaller large
> folio.

Thanks.

What are the effects of this change?  I'm assuming it's an
*improvement*, rather than a fix for some misbehavior?