From nobody Mon Nov 01 13:52:18 2021 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 1AA6E183E40D; Mon, 1 Nov 2021 13:52:19 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HjZGV3BRwz4pKs; Mon, 1 Nov 2021 13:52:18 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 339E712D08; Mon, 1 Nov 2021 13:52:18 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1A1DqIvr066871; Mon, 1 Nov 2021 13:52:18 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1A1DqIQq066870; Mon, 1 Nov 2021 13:52:18 GMT (envelope-from git) Date: Mon, 1 Nov 2021 13:52:18 GMT Message-Id: <202111011352.1A1DqIQq066870@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mark Johnston Subject: git: 7585c5db25b7 - main - uma: Fix handling of reserves in zone_import() List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 7585c5db25b700d19baebd7afd7a1b2e03c29cda Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=7585c5db25b700d19baebd7afd7a1b2e03c29cda commit 7585c5db25b700d19baebd7afd7a1b2e03c29cda Author: Mark Johnston AuthorDate: 2021-11-01 13:27:52 +0000 Commit: Mark Johnston CommitDate: 2021-11-01 13:51:43 +0000 uma: Fix handling of reserves in zone_import() Kegs with no items reserved have uk_reserve = 0. So the check keg->uk_reserve >= dom->ud_free_items will be true once all slabs are depleted. Then, rather than go and allocate a fresh slab, we return to the cache layer. The intent was to do this only when the keg actually has a reserve, so modify the check to verify this first. Another approach would be to make uk_reserve signed and set it to -1 until uma_zone_reserve() is called, but this requires a few casts elsewhere. Fixes: 1b2dcc8c54a8 ("uma: Avoid depleting keg reserves when filling a bucket") MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32516 --- sys/vm/uma_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c index de9605a28bb6..7b83d81a423d 100644 --- a/sys/vm/uma_core.c +++ b/sys/vm/uma_core.c @@ -4038,7 +4038,8 @@ zone_import(void *arg, void **bucket, int max, int domain, int flags) dom = &keg->uk_domain[slab->us_domain]; do { bucket[i++] = slab_alloc_item(keg, slab); - if (dom->ud_free_items <= keg->uk_reserve) { + if (keg->uk_reserve > 0 && + dom->ud_free_items <= keg->uk_reserve) { /* * Avoid depleting the reserve after a * successful item allocation, even if