Messages in this thread | | | Date | Tue, 17 Apr 2018 09:40:15 -0500 (CDT) | From | Christopher Lameter <> | Subject | Re: slab: introduce the flag SLAB_MINIMIZE_WASTE |
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On Mon, 16 Apr 2018, Mikulas Patocka wrote:
> dm-bufio deals gracefully with allocation failure, because it preallocates > some buffers with vmalloc, but other subsystems may not deal with it and > they cound return ENOMEM randomly or misbehave in other ways. So, the > "SLAB_MINIMIZE_WASTE" flag is also saying that the allocation may fail and > the caller is prepared to deal with it. > > The slub subsystem does actual fallback to low-order when the allocation > fails (it allows different order for each slab in the same cache), but > slab doesn't fallback and you get NULL if higher-order allocation fails. > So, SLAB_MINIMIZE_WASTE is needed for slab because it will just randomly > fail with higher order.
Fix Slab instead of adding a flag that is only useful for one allocator?
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