Re: [PATCH 1/2] mm/page_alloc: add tracepoints for zone->lock acquisitions

[Vlastimil Babka (SUSE)]

On 5/8/26 7:38 PM, Vlastimil Babka (SUSE) wrote:
> On 5/8/26 7:29 PM, Andrew Morton wrote:
>> e .configOn Fri,  8 May 2026 18:22:06 +0200 hawk@xxxxxxxxxx wrote:
>>
>>> Add tracepoints to the page allocator fast paths that acquire
>>> zone->lock, allowing diagnosis of lock contention in production.
>>
>> Thanks, I'm surprised we haven't done this yet.
> 
> There was a recent attempt [1]. Not being a generic solution wasn't welcome.
> 
> [1] https://lore.kernel.org/all/cover.1772206930.git.d@xxxxxxxxxxxx/

And this is the generic solution I think?

https://lore.kernel.org/all/cover.1777999826.git.d@xxxxxxxxxxxx/

>> Unfortunately "mm: use spinlock guards for zone lock" messed this up
>> (https://lore.kernel.org/all/cover.1777462630.git.d@xxxxxxxxxxxx/).
>>
>> So please let's give it a few days for reviewers to comment then redo
>> against mm.git's mm-unstable branch?
>