Date: Mon, 5 Jun 2023 08:36:04 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: 4ae4e074ebe8 - stable/13 - unr(9): document clean_unrhdr() Message-ID: <202306050836.3558a48v024410@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=4ae4e074ebe8d1ffa749ae7444b1704acc2b25d2 commit 4ae4e074ebe8d1ffa749ae7444b1704acc2b25d2 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2023-05-14 00:43:54 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2023-06-05 08:35:01 +0000 unr(9): document clean_unrhdr() (cherry picked from commit f8c37080853c13ada935e7fe3d53286c1d9220f1) --- share/man/man9/unr.9 | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/share/man/man9/unr.9 b/share/man/man9/unr.9 index c2e9b3943829..c0cf44b9033e 100644 --- a/share/man/man9/unr.9 +++ b/share/man/man9/unr.9 @@ -29,6 +29,7 @@ .Os .Sh NAME .Nm new_unrhdr , +.Nm clean_unrhdr , .Nm clear_unrhdr , .Nm delete_unrhdr , .Nm alloc_unr , @@ -40,6 +41,10 @@ .Ft "struct unrhdr *" .Fn new_unrhdr "int low" "int high" "struct mtx *mutex" .Ft void +.Fn clean_unrhdr "struct unrhdr *uh" +.Ft void +.Fn clean_unrhdrl "struct unrhdr *uh" +.Ft void .Fn clear_unrhdr "struct unrhdr *uh" .Ft void .Fn delete_unrhdr "struct unrhdr *uh" @@ -86,6 +91,26 @@ This function frees the memory associated with the entity, it does not free any units. To free all units use .Fn clear_unrhdr . +.It Fn clean_unrhdr uh +Freeing unit numbers might result in some internal memory becoming unused. +There are +.Nm unit +allocator consumers that cannot tolerate taking +.Xr malloc 9 +locks to free the memory, while having their unit mutex locked. +For this reason, free of the unused memory after delete is postponed +until the consumer can afford calling into the +.Xr malloc 9 +subsystem. +Call +.Fn clean_unrhdr uh +to do the cleanup. +In particular, this needs to be done before freeing a unr, if +a deletion of units could have been performed. +.It Fn clean_unrhdrl +Same as +.Fn clean_unrhdr , +but assumes that the unr mutex is already owned, if any. .It Fn alloc_unr uh Return a new unit number. The lowest free number is always allocated.
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