Date: Mon, 5 Jun 2023 08:36:03 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: c26549327f42 - stable/13 - subr_unit.c: explain first/last special ranges Message-ID: <202306050836.3558a3Uk024391@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=c26549327f425bc1b0272037d524af18392c0c88 commit c26549327f425bc1b0272037d524af18392c0c88 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2023-05-14 23:11:17 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2023-06-05 08:35:01 +0000 subr_unit.c: explain first/last special ranges (cherry picked from commit d44f477038d3ede5fe62fa19c9301b43455cd8f1) --- 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 6c1368c64e00..a78b6ddf4840 100644 --- a/sys/kern/subr_unit.c +++ b/sys/kern/subr_unit.c @@ -191,6 +191,12 @@ 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;
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