Date: Wed, 2 Aug 2023 11:15:37 +0300 From: Dmitry Chagin <dchagin@freebsd.org> To: Doug Moore <dougm@freebsd.org> Cc: 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: <CAC0jpUCEyN0STBvuqv2kcvV8NY04RXGdszEf2MS6pJKC3bf8Kw@mail.gmail.com> In-Reply-To: <202308020314.3723ETgj027830@gitrepo.freebsd.org> References: <202308020314.3723ETgj027830@gitrepo.freebsd.org>
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--000000000000675be50601ec45f2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, With this change, I got a panic: vm_phys_enq_range: page 0xfffffe0000000000 and pages 0 are misaligned =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: > > URL: > https://cgit.FreeBSD.org/src/commit/?id=3D1a7fcf6d51eb67ee3e05fdbb806f7e6= 8f9f53c9c > > 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 > > vm_phys_enqueue_contig: handle npages=3D=3D0 > > 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_conti= g > call vm_phys_enqueue_contig for part of its work also saves a few > bytes. > > The amd64 object code shrinks by 80 bytes. > > Reviewed by: kib > Differential Revision: https://reviews.freebsd.org/D41154 > --- > sys/vm/vm_phys.c | 74 > +++++++++++++++++++++++++++----------------------------- > 1 file changed, 35 insertions(+), 39 deletions(-) > > 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("$FreeBSD$"); > > _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."); > > #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; > > - 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); > } > > /* > @@ -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; > > 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 NUL= L) { > 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. It= s > - * order [0, oind) queues are > empty. > + * Return excess pages to fl. It= s > 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, avai= l > - > - need, fl, 1); > - return (npages); > - } else if (i =3D=3D npages) > + vm_phys_enq_range(m, avai= l > - 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)); > } > > @@ -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; > > /* > @@ -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); > } > > --000000000000675be50601ec45f2 Content-Type: text/html; charset="UTF-8" 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