From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-f54.google.com (mail-wr1-f54.google.com [209.85.221.54]) by sourceware.org (Postfix) with ESMTPS id 78C253858C2C for ; Fri, 22 Apr 2022 13:35:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 78C253858C2C Received: by mail-wr1-f54.google.com with SMTP id u3so11116874wrg.3 for ; Fri, 22 Apr 2022 06:35:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=81KA0yjz1EeAojmvSBA97pCInuxKMkSxXDJCOvuz+pk=; b=E9yprL1DWEkEYuOb3AixmxBD17U/JlpEzTXkdKjIKmIv1o4ub68U44hnFOxEmS60mZ cReiL8Xcl+c5Ym9IGlRkqCMgIWVFKLl0xlCGcJYmExON71aeLvN92Sa82achZP4jaq1K 0semfCC1iXAxjuJurGRtK0Z3TClITnwuY0QB/Bp9/Mexocd2b+efX09tJIOHbGHYr2HK zFEDTjGI6/hlHUOenKA/EiYYs9fSVWn8PGU8kLB5EUKjB5hCyVxKWmmG0hDTL1Vo6Qeh Sz24V/DdSS10XuQ+mW559XQiz1yse6kurcNC0rjeP39IfLXJgiBWF9HhQHnaL7fOaSUn fwDg== X-Gm-Message-State: AOAM532A9GMv2FA40hByi4AiUMVFHQgw7ETzNgiFPan5YyDspM5NGjX2 W8nfdunDHJxY1HGdqK78mbZCtQVwYX2hjUifHtaXlw== X-Google-Smtp-Source: ABdhPJynDBxACcmztNxe1/XJrC9cDcLumzlRmttVk6dAJ/PmZN8tWJNmBWm+k+ue2u4VDNljg7nSF4eicahB9FbF9cg= X-Received: by 2002:adf:f6c1:0:b0:20a:c408:4aeb with SMTP id y1-20020adff6c1000000b0020ac4084aebmr3782111wrp.74.1650634532422; Fri, 22 Apr 2022 06:35:32 -0700 (PDT) MIME-Version: 1.0 References: <20220328084705.468207-1-wangyang.guo@intel.com> <97b1105f-42e8-a347-f82e-c81e548f0c2f@linaro.org> <82d5d195-aea0-f817-bfc1-5822829728c7@linaro.org> <87wnfufrh2.fsf@oldenburg.str.redhat.com> <6d934a2c-8f89-50ca-11b8-e2eaeb046add@opteya.com> <87o80ts0pa.fsf@oldenburg.str.redhat.com> In-Reply-To: <87o80ts0pa.fsf@oldenburg.str.redhat.com> From: =?UTF-8?Q?Cristian_Rodr=C3=ADguez?= Date: Fri, 22 Apr 2022 09:35:21 -0400 Message-ID: Subject: Re: [PATCH v2] nptl: Add backoff mechanism to spinlock loop To: Florian Weimer Cc: Yann Droneaud , Wangyang Guo , Adhemerval Zanella via Libc-alpha Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Apr 2022 13:35:34 -0000 On Fri, Apr 22, 2022 at 9:32 AM Florian Weimer via Libc-alpha wrote: > > As each running threads has its own stack, thread' stack address can > > be used as a seed for such PRNG. > > We would broadcast the stack address though, which is generally fround > upon. i> You can use the siphash approach suggested by Jason if there is a concern of leaking that information.