Date: Mon, 29 May 2023 22:11:20 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: d44f477038d3 - main - subr_unit.c: explain first/last special ranges Message-ID: <202305292211.34TMBKGJ043831@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=d44f477038d3ede5fe62fa19c9301b43455cd8f1 commit d44f477038d3ede5fe62fa19c9301b43455cd8f1 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2023-05-14 23:11:17 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2023-05-29 22:10:35 +0000 subr_unit.c: explain first/last special ranges Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D40089 --- sys/kern/subr_unit.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sys/kern/subr_unit.c b/sys/kern/subr_unit.c index a1878ea4b144..b0977c3c01b9 100644 --- a/sys/kern/subr_unit.c +++ b/sys/kern/subr_unit.c @@ -178,6 +178,12 @@ mtx_assert(struct mtx *mp, int flag) * For bitmaps the len field represents the number of allocated items. * * The bitmap is the same size as struct unr to optimize memory management. + * + * Two special ranges are not covered by unrs: + * - at the start of the allocator space, all elements in [low, low + first) + * are allocated; + * - at the end of the allocator space, all elements in [high - last, high] + * are free. */ struct unr { TAILQ_ENTRY(unr) list;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202305292211.34TMBKGJ043831>