On Sat, Aug 29, 2020 at 04:29:53AM +0000, Warner Losh wrote:
> Author: imp
> Date: Sat Aug 29 04:29:53 2020
> New Revision: 364944
> URL: https://svnweb.freebsd.org/changeset/base/364944
>
> Log:
> devctl: move to using a uma zone
>
> Convert the memory management of devctl. Rewrite if to make better
> use of memory. This eliminates several mallocs (5? worse case) needed
> to send a message. It's now possible to always send a message, though
> if things are really backed up the oldest message will be dropped to
> free up space for the newest.
>
> Add a static bus_child_{location,pnpinfo}_sb to start migrating to
> sbuf instead of buffer + length. Use it in the new code. Other code
> will be converted later (bus_child_*_str is only used inside of
> subr_bus.c, though implemented in ~100 places in the tree).
>
> Reviewed by: markj@
> Differential Revision: https://reviews.freebsd.org/D26140
>
> Modified:
> head/sys/kern/subr_bus.c
>
> + } else {
> + /* dei can't be NULL -- we know we have at least one in the
> zone */
> + dei = uma_zalloc(devsoftc.zone, M_NOWAIT);
> + MPASS(dei != NULL);
This does not work. I believe you need to disable per-cpu cache for the
zone, at least. But I am not sure it is enough.
https://people.freebsd.org/~pho/stress/log/kostik1314.txt
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