Date: Wed, 2 Aug 2023 11:23:48 +0200 From: tuexen@fh-muenster.de To: Dmitry Chagin <dchagin@freebsd.org> Cc: Doug Moore <dougm@freebsd.org>, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org, src-committers@freebsd.org Subject: Re: git: 1a7fcf6d51eb - main - vm_phys_enqueue_contig: handle npages==0 Message-ID: <B6B2B80C-3633-4041-AD13-ABCED4F3A3C4@fh-muenster.de> In-Reply-To: <CAC0jpUCEyN0STBvuqv2kcvV8NY04RXGdszEf2MS6pJKC3bf8Kw@mail.gmail.com> References: <202308020314.3723ETgj027830@gitrepo.freebsd.org> <CAC0jpUCEyN0STBvuqv2kcvV8NY04RXGdszEf2MS6pJKC3bf8Kw@mail.gmail.com>
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--Apple-Mail=_EE90BED6-27D5-418F-BB28-2CEC87741BBE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 2. Aug 2023, at 10:15, Dmitry Chagin <dchagin@freebsd.org> wrote: >=20 >=20 > Hi, >=20 > With this change, I got a panic: > vm_phys_enq_range: page 0xfffffe0000000000 and pages 0 are misaligned My arm64 system also panics: panic: vm_phys_enq_range: page 0xffffa000796a7000 and npages 4294443008 = are misaligned Best regards Michael >=20 > =D0=A1=D1=80, 2 =D0=B0=D0=B2=D0=B3. 2023 =D0=B3. =D0=B2 06:22, Doug = Moore <dougm@freebsd.org>: > The branch main has been updated by dougm: >=20 > URL: = https://cgit.FreeBSD.org/src/commit/?id=3D1a7fcf6d51eb67ee3e05fdbb806f7e68= f9f53c9c >=20 > commit 1a7fcf6d51eb67ee3e05fdbb806f7e68f9f53c9c > Author: Doug Moore <dougm@FreeBSD.org> > AuthorDate: 2023-08-02 03:12:00 +0000 > Commit: Doug Moore <dougm@FreeBSD.org> > CommitDate: 2023-08-02 03:12:00 +0000 >=20 > vm_phys_enqueue_contig: handle npages=3D=3D0 >=20 > By letting vm_phys_enqueue_contig handle the case when npages =3D=3D= 0, > the callers can stop checking it, and the compiler can stop > zero-checking with every call to ffs(). Letting = vm_phys_enqueue_contig > call vm_phys_enqueue_contig for part of its work also saves a few > bytes. >=20 > The amd64 object code shrinks by 80 bytes. >=20 > Reviewed by: kib > Differential Revision: https://reviews.freebsd.org/D41154 > --- > sys/vm/vm_phys.c | 74 = +++++++++++++++++++++++++++----------------------------- > 1 file changed, 35 insertions(+), 39 deletions(-) >=20 > diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c > index 28f12231e01c..b2084bdef4e1 100644 > --- a/sys/vm/vm_phys.c > +++ b/sys/vm/vm_phys.c > @@ -72,6 +72,8 @@ __FBSDID("$FreeBSD$"); >=20 > _Static_assert(sizeof(long) * NBBY >=3D VM_PHYSSEG_MAX, > "Too many physsegs."); > +_Static_assert(sizeof(long long) >=3D sizeof(vm_paddr_t), > + "vm_paddr_t too big for ffsll, flsll."); >=20 > #ifdef NUMA > struct mem_affinity __read_mostly *mem_affinity; > @@ -690,18 +692,16 @@ vm_phys_split_pages(vm_page_t m, int oind, = struct vm_freelist *fl, int order, > * > * The physical page m's buddy must not be free. > */ > -static void > +static vm_page_t > vm_phys_enq_range(vm_page_t m, u_int npages, struct vm_freelist *fl, = int tail) > { > - u_int n; > int order; >=20 > - KASSERT(npages > 0, ("vm_phys_enq_range: npages is 0")); > KASSERT(((VM_PAGE_TO_PHYS(m) + npages * PAGE_SIZE) & > ((PAGE_SIZE << (fls(npages) - 1)) - 1)) =3D=3D 0, > ("vm_phys_enq_range: page %p and npages %u are = misaligned", > m, npages)); > - do { > + while (npages > 0) { > KASSERT(m->order =3D=3D VM_NFREEORDER, > ("vm_phys_enq_range: page %p has unexpected order = %d", > m, m->order)); > @@ -709,10 +709,10 @@ vm_phys_enq_range(vm_page_t m, u_int npages, = struct vm_freelist *fl, int tail) > KASSERT(order < VM_NFREEORDER, > ("vm_phys_enq_range: order %d is out of range", = order)); > vm_freelist_add(fl, m, order, tail); > - n =3D 1 << order; > - m +=3D n; > - npages -=3D n; > - } while (npages > 0); > + m +=3D 1 << order; > + npages -=3D 1 << order; > + } > + return (m); > } >=20 > /* > @@ -744,7 +744,7 @@ vm_phys_alloc_npages(int domain, int pool, int = npages, vm_page_t ma[]) > { > struct vm_freelist *alt, *fl; > vm_page_t m; > - int avail, end, flind, freelist, i, need, oind, pind; > + int avail, end, flind, freelist, i, oind, pind; >=20 > KASSERT(domain >=3D 0 && domain < vm_ndomains, > ("vm_phys_alloc_npages: domain %d is out of range", = domain)); > @@ -762,20 +762,18 @@ vm_phys_alloc_npages(int domain, int pool, int = npages, vm_page_t ma[]) > for (oind =3D 0; oind < VM_NFREEORDER; oind++) { > while ((m =3D TAILQ_FIRST(&fl[oind].pl)) !=3D = NULL) { > vm_freelist_rem(fl, m, oind); > - avail =3D 1 << oind; > - need =3D imin(npages - i, avail); > - for (end =3D i + need; i < end;) > + avail =3D i + (1 << oind); > + end =3D imin(npages, avail); > + while (i < end) > ma[i++] =3D m++; > - if (need < avail) { > + if (i =3D=3D npages) { > /* > - * Return excess pages to fl. = Its > - * order [0, oind) queues are = empty. > + * Return excess pages to fl. = Its order > + * [0, oind) queues are empty. > */ > - vm_phys_enq_range(m, avail - = need, fl, > - 1); > - return (npages); > - } else if (i =3D=3D npages) > + vm_phys_enq_range(m, avail - = i, fl, 1); > return (npages); > + } > } > } > for (oind =3D VM_NFREEORDER - 1; oind >=3D 0; oind--) = { > @@ -785,21 +783,20 @@ vm_phys_alloc_npages(int domain, int pool, int = npages, vm_page_t ma[]) > NULL) { > vm_freelist_rem(alt, m, oind); > vm_phys_set_pool(pool, m, = oind); > - avail =3D 1 << oind; > - need =3D imin(npages - i, = avail); > - for (end =3D i + need; i < = end;) > + avail =3D i + (1 << oind); > + end =3D imin(npages, avail); > + while (i < end) > ma[i++] =3D m++; > - if (need < avail) { > + if (i =3D=3D npages) { > /* > * Return excess pages = to fl. > * Its order [0, oind) = queues > * are empty. > */ > - vm_phys_enq_range(m, = avail - > - need, fl, 1); > - return (npages); > - } else if (i =3D=3D npages) > + vm_phys_enq_range(m, = avail - i, > + fl, 1); > return (npages); > + } > } > } > } > @@ -1146,7 +1143,7 @@ max_order(vm_page_t m) > * because the size of a physical address exceeds the size of > * a long. > */ > - return (min(ffsl(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1, > + return (min(ffsll(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1, > VM_NFREEORDER - 1)); > } >=20 > @@ -1162,6 +1159,7 @@ vm_phys_enqueue_contig(vm_page_t m, u_long = npages) > struct vm_freelist *fl; > struct vm_phys_seg *seg; > vm_page_t m_end; > + vm_paddr_t diff, lo; > int order; >=20 > /* > @@ -1173,15 +1171,15 @@ vm_phys_enqueue_contig(vm_page_t m, u_long = npages) > fl =3D (*seg->free_queues)[m->pool]; > m_end =3D m + npages; > /* Free blocks of increasing size. */ > - while ((order =3D max_order(m)) < VM_NFREEORDER - 1 && > - m + (1 << order) <=3D m_end) { > - KASSERT(seg =3D=3D &vm_phys_segs[m->segind], > - ("%s: page range [%p,%p) spans multiple segments", > - __func__, m_end - npages, m)); > - vm_freelist_add(fl, m, order, 1); > - m +=3D 1 << order; > + lo =3D VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT; > + if (m < m_end && > + (diff =3D lo ^ (lo + npages - 1)) !=3D 0) { > + order =3D min(flsll(diff) - 1, VM_NFREEORDER - 1); > + m =3D vm_phys_enq_range(m, roundup2(-lo, 1 << order), = fl, 1); > } > + > /* Free blocks of maximum size. */ > + order =3D VM_NFREEORDER - 1; > while (m + (1 << order) <=3D m_end) { > KASSERT(seg =3D=3D &vm_phys_segs[m->segind], > ("%s: page range [%p,%p) spans multiple segments", > @@ -1560,10 +1558,8 @@ vm_phys_alloc_contig(int domain, u_long npages, = vm_paddr_t low, vm_paddr_t high, > vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m, = oind); > } > /* Return excess pages to the free lists. */ > - if (&m_run[npages] < m) { > - fl =3D (*queues)[VM_FREEPOOL_DEFAULT]; > - vm_phys_enq_range(&m_run[npages], m - &m_run[npages], = fl, 0); > - } > + fl =3D (*queues)[VM_FREEPOOL_DEFAULT]; > + vm_phys_enq_range(&m_run[npages], m - &m_run[npages], fl, 0); > return (m_run); > } >=20 --Apple-Mail=_EE90BED6-27D5-418F-BB28-2CEC87741BBE Content-Disposition: attachment; filename=smime.p7s Content-Type: 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