SVNews r332572

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2018-04-16 15:07:19 - r332572 by glebius (Gleb Smirnoff)

Complete list of files affected by revision r332572:

(Note: At the moment, these links point to ViewVC on svn.freebsd.org. They are probably slow. Do not overuse.)

	Contents		MODIFY	`/stable/11`
History	Contents	Diff	MODIFY	`/stable/11/sys/vm/uma_core.c`

Commit message:

Merge r331871:

  Handle a special case when a slab can fit only one allocation,

  and zone has a large alignment. With alignment taken into

  account uk_rsize will be greater than space in a slab. However,

  since we have only one item per slab, it is always naturally

  aligned.



  Code that will panic before this change with 4k page:



        z = uma_zcreate("test", 3984, NULL, NULL, NULL, NULL, 31, 0);

        uma_zalloc(z, M_WAITOK);



  A practical scenario to hit the panic is a machine with 56 CPUs

  and 2 NUMA domains, which yields in zone size of 3984 (on head).



PR:             227116

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