Date: Mon, 4 Dec 2023 22:27:00 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: e3cbc572f154 - main - kern/subr_trap.c: repair the HPTS performance hack in userret() Message-ID: <ZW42FH2wpsJInlUI@kib.kiev.ua> In-Reply-To: <202312041859.3B4IxVcB043749@gitrepo.freebsd.org> References: <202312041859.3B4IxVcB043749@gitrepo.freebsd.org>
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On Mon, Dec 04, 2023 at 06:59:31PM +0000, Gleb Smirnoff wrote: > The branch main has been updated by glebius: > > URL: https://cgit.FreeBSD.org/src/commit/?id=e3cbc572f1541fdc18be9971d23e210d5018e662 > > commit e3cbc572f1541fdc18be9971d23e210d5018e662 > Author: Gleb Smirnoff <glebius@FreeBSD.org> > AuthorDate: 2023-12-04 18:19:46 +0000 > Commit: Gleb Smirnoff <glebius@FreeBSD.org> > CommitDate: 2023-12-04 18:19:46 +0000 > > kern/subr_trap.c: repair the HPTS performance hack in userret() > > It wasn't functional as subr_trap.c doesn't include opt_inet.h. Put a > better comment provided by gallatin@ in place of the old one. The idea > is to use userret() as a cheap place to call a soft clock. This approach > saves CPU on busy machines and saves power on idle machines. > An alternative would be to constantly schedule callouts. Running with > neither callouts nor the soft clock ruins HPTS precision. Can this be converted to AST, and scheduled as needed, instead of current ugliness?
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