Date: Mon, 11 Jan 2016 11:08:52 -0800 From: Adrian Chadd <adrian@freebsd.org> To: cem@freebsd.org Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r293640 - head/sys/vm Message-ID: <CAJ-Vmo=q9w3sPW7U7M6NVMb5pRWu9Z2_uCwSYr%2B3kzQrFGv3zQ@mail.gmail.com> In-Reply-To: <CAG6CVpWTP7Y2LUs299K=Mtpp5rBmojm2aQLZ3gEhy9eBOJshzA@mail.gmail.com> References: <201601101753.u0AHrhSJ099996@repo.freebsd.org> <CAG6CVpWTP7Y2LUs299K=Mtpp5rBmojm2aQLZ3gEhy9eBOJshzA@mail.gmail.com>
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yes sorry, I forgot about the PR! -a On 11 January 2016 at 10:12, Conrad Meyer <cem@freebsd.org> wrote: > Does this fix https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204121 ? > > Thanks, > Conrad > > On Sun, Jan 10, 2016 at 9:53 AM, Adrian Chadd <adrian@freebsd.org> wrote: >> Author: adrian >> Date: Sun Jan 10 17:53:43 2016 >> New Revision: 293640 >> URL: https://svnweb.freebsd.org/changeset/base/293640 >> >> Log: >> Fix the domain iterator to not try the first-touch / fixed domain >> more than once when doing round-robin. >> >> This lead to a panic because the iterator was trying the same domain >> twice and not trying one of the other domains. >> >> Reported by: pho >> Tested by: pho >> >> Modified: >> head/sys/vm/vm_domain.c >> >> Modified: head/sys/vm/vm_domain.c >> ============================================================================== >> --- head/sys/vm/vm_domain.c Sun Jan 10 17:47:57 2016 (r293639) >> +++ head/sys/vm/vm_domain.c Sun Jan 10 17:53:43 2016 (r293640) >> @@ -62,7 +62,7 @@ __FBSDID("$FreeBSD$"); >> #include <vm/vm_domain.h> >> >> static __inline int >> -vm_domain_rr_selectdomain(void) >> +vm_domain_rr_selectdomain(int skip_domain) >> { >> #if MAXMEMDOM > 1 >> struct thread *td; >> @@ -71,6 +71,16 @@ vm_domain_rr_selectdomain(void) >> >> td->td_dom_rr_idx++; >> td->td_dom_rr_idx %= vm_ndomains; >> + >> + /* >> + * If skip_domain is provided then skip over that >> + * domain. This is intended for round robin variants >> + * which first try a fixed domain. >> + */ >> + if ((skip_domain > -1) && (td->td_dom_rr_idx == skip_domain)) { >> + td->td_dom_rr_idx++; >> + td->td_dom_rr_idx %= vm_ndomains; >> + } >> return (td->td_dom_rr_idx); >> #else >> return (0); >> @@ -339,12 +349,12 @@ vm_domain_iterator_run(struct vm_domain_ >> if (vi->n == vm_ndomains) >> *domain = vi->domain; >> else >> - *domain = vm_domain_rr_selectdomain(); >> + *domain = vm_domain_rr_selectdomain(vi->domain); >> vi->n--; >> break; >> case VM_POLICY_ROUND_ROBIN: >> default: >> - *domain = vm_domain_rr_selectdomain(); >> + *domain = vm_domain_rr_selectdomain(-1); >> vi->n--; >> break; >> } >>
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