RE: Do we really need SLOB nowdays?

[David Laight]

From: Hyeonggon Yoo
> Sent: 18 February 2022 10:13
...
> I think SLUB can be memory-efficient as SLOB.
> Is SLOB (Address-Ordered next^Wfirst fit) stronger to fragmentation than SLUB?

Dunno, but I had to patch the vxworks malloc to use 'best fit'
because 'first fit' based on a fifo free list was really horrid.

I can't imagine an address ordered 'first fit' really being that much better.

There are probably a lot more allocs and frees than the kernel used to have.

Also isn't the performance of a 'first fit' going to get horrid
when there are a lot of small items on the free list.

Does SLUB split pages into 3s and 5s (on cache lime boundaries)
as well as powers of 2?

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)