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[192.94.31.2]) by smtp.gmail.com with ESMTPSA id c4-20020a7bc844000000b00397243d3dbcsm19420074wml.31.2022.06.07.02.14.35 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jun 2022 02:14:35 -0700 (PDT) Message-ID: <546afbb1-5282-8723-ed04-db6f7f85aa58@gmail.com> Date: Tue, 7 Jun 2022 11:14:28 +0200 List-Id: Threading List-Archive: https://lists.freebsd.org/archives/freebsd-threads List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-threads@freebsd.org X-BeenThere: freebsd-threads@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: LDT/GDT and TCB use by threads To: freebsd-threads@freebsd.org References: <75f350fa-4fb5-f1e7-2a45-bb825a6620d3@gmail.com> From: "Floyd, Paul" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4LHPnT33Hfz4bQK X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=mElEFonh; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of paulf2718@gmail.com designates 2a00:1450:4864:20::431 as permitted sender) smtp.mailfrom=paulf2718@gmail.com X-Spamd-Result: default: False [-4.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-0.998]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-threads@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::431:from]; MLMMJ_DEST(0.00)[freebsd-threads]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N Hi I have now fixed this issue, mainly by tracing the working Valgrind x86 Linux version. Previously, on FreeBSD the first thread created would allocate a GDT and this would be reused by all other threads until the creation of the 8192nd thread when there would no longer be a free slot and it would fail. Now each thread gets its own GDT which is initialized as a copy of the parent thread's GDT. This GDT gets freed after thr_exit. No more slot exhaustion due to large numbers of short-lived threads being created. A+ Paul