Date: Sun, 7 Apr 2024 17:29:20 GMT From: Doug Moore <dougm@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 1526667bc6e2 - main - vm_reserv: Add vm_reserv_is_populated Message-ID: <202404071729.437HTKXB077459@gitrepo.freebsd.org>
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The branch main has been updated by dougm: URL: https://cgit.FreeBSD.org/src/commit/?id=1526667bc6e2c1042010de25e7a0226c0f1b44be commit 1526667bc6e2c1042010de25e7a0226c0f1b44be Author: Doug Moore <dougm@FreeBSD.org> AuthorDate: 2024-04-07 17:19:41 +0000 Commit: Doug Moore <dougm@FreeBSD.org> CommitDate: 2024-04-07 17:28:52 +0000 vm_reserv: Add vm_reserv_is_populated Add a function to check whether an aligned block of vm pages are allocated, for use with impending changes to arm64 superpage managment. Reviewed by: alc Differential Revision: http://reviews.freebsd.org/D44575 --- sys/vm/vm_reserv.c | 21 +++++++++++++++++++++ sys/vm/vm_reserv.h | 1 + 2 files changed, 22 insertions(+) diff --git a/sys/vm/vm_reserv.c b/sys/vm/vm_reserv.c index 7b4a39a34906..b3b1dc62f14e 100644 --- a/sys/vm/vm_reserv.c +++ b/sys/vm/vm_reserv.c @@ -1058,6 +1058,27 @@ vm_reserv_is_page_free(vm_page_t m) return (!bit_test(rv->popmap, m - rv->pages)); } +/* + * Returns true if the given page is part of a block of npages, starting at a + * multiple of npages, that are all allocated. Otherwise, returns false. + */ +bool +vm_reserv_is_populated(vm_page_t m, int npages) +{ + vm_reserv_t rv; + int index; + + KASSERT(npages <= VM_LEVEL_0_NPAGES, + ("%s: npages %d exceeds VM_LEVEL_0_NPAGES", __func__, npages)); + KASSERT(powerof2(npages), + ("%s: npages %d is not a power of 2", __func__, npages)); + rv = vm_reserv_from_page(m); + if (rv->object == NULL) + return (false); + index = rounddown2(m - rv->pages, npages); + return (bit_ntest(rv->popmap, index, index + npages - 1, 1)); +} + /* * If the given page belongs to a reservation, returns the level of that * reservation. Otherwise, returns -1. diff --git a/sys/vm/vm_reserv.h b/sys/vm/vm_reserv.h index 44e8a939d165..98780efc9d37 100644 --- a/sys/vm/vm_reserv.h +++ b/sys/vm/vm_reserv.h @@ -55,6 +55,7 @@ void vm_reserv_break_all(vm_object_t object); boolean_t vm_reserv_free_page(vm_page_t m); void vm_reserv_init(void); bool vm_reserv_is_page_free(vm_page_t m); +bool vm_reserv_is_populated(vm_page_t m, int npages); int vm_reserv_level(vm_page_t m); int vm_reserv_level_iffullpop(vm_page_t m); vm_page_t vm_reserv_reclaim_contig(int domain, u_long npages,
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