Re: [RFC 01/26] mm, slub: allocate private object map for sysfs listings

[Mel Gorman]

On Tue, May 25, 2021 at 01:39:21AM +0200, Vlastimil Babka wrote:
> Slub has a static spinlock protected bitmap for marking which objects are on
> freelist when it wants to list them, for situations where dynamically
> allocating such map can lead to recursion or locking issues, and on-stack
> bitmap would be too large.
> 
> The handlers of sysfs files alloc_calls and free_calls also currently use this
> shared bitmap, but their syscall context makes it straightforward to allocate a
> private map before entering locked sections, so switch these processing paths
> to use a private bitmap.
> 
> Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>

Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>

-- 
Mel Gorman
SUSE Labs