On Wed, Aug 17, 2022 at 06:52:21PM +0000, Gleb Smirnoff wrote: > The branch main has been updated by glebius: > > URL: > https://cgit.FreeBSD.org/src/commit/?id=81a34d374ed6e5a7b14f24583bc8e3abfdc66306 > > commit 81a34d374ed6e5a7b14f24583bc8e3abfdc66306 > Author: Gleb Smirnoff <gleb...@freebsd.org> > AuthorDate: 2022-08-17 18:50:31 +0000 > Commit: Gleb Smirnoff <gleb...@freebsd.org> > CommitDate: 2022-08-17 18:50:31 +0000 > > protosw: retire pr_drain and use EVENTHANDLER(9) directly > > The method was called for two different conditions: 1) the VM layer is > low on pages or 2) one of UMA zones of mbuf allocator exhausted. > This change 2) into a new event handler, but all affected network > subsystems modified to subscribe to both, so this change shall not > bring functional changes under different low memory situations. > > There were three subsystems still using pr_drain: TCP, SCTP and frag6. > The latter had its protosw entry for the only reason to register its > pr_drain method. > > Reviewed by: tuexen, melifaro > Differential revision: https://reviews.freebsd.org/D36164 ...
> diff --git a/sys/vm/vm_pageout.h b/sys/vm/vm_pageout.h > index 82ba3c81ef1b..63d31dc1d135 100644 > --- a/sys/vm/vm_pageout.h > +++ b/sys/vm/vm_pageout.h > @@ -87,6 +87,7 @@ extern int vm_pageout_page_count; > */ > #define VM_LOW_KMEM 0x01 > #define VM_LOW_PAGES 0x02 > +#define VM_LOW_MBUFS 0x04 This is very weird, to put it mildly.
