From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26102C64E8A for ; Mon, 30 Nov 2020 09:18:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B35AE20809 for ; Mon, 30 Nov 2020 09:18:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="CPDJeRq8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726032AbgK3JSd (ORCPT ); Mon, 30 Nov 2020 04:18:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725972AbgK3JSb (ORCPT ); Mon, 30 Nov 2020 04:18:31 -0500 Received: from mail-qk1-x729.google.com (mail-qk1-x729.google.com [IPv6:2607:f8b0:4864:20::729]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A118C0613D2 for ; Mon, 30 Nov 2020 01:17:51 -0800 (PST) Received: by mail-qk1-x729.google.com with SMTP id n132so10195642qke.1 for ; Mon, 30 Nov 2020 01:17:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:references:in-reply-to:mime-version:thread-index:date :message-id:subject:to:cc; bh=btYv57KOOxuN81aqKrzzb+qrjGN7bmHVQoqAJFKmd9Y=; b=CPDJeRq8sFxaz3Bj9yTmQRt1uK+ToYMIM/JNE32/Y/dSu7+3OmiQbk39v4pfWpzzWC DVIeUgpSs9SwIrpaQVzCfBI8EFckzEMDdvFjFRM4irz5LHoRtfLFc6V/2poX6J6prQ2n m7mJc2Cg7Wx5cxLFbZ31KgT/I8MP991GVa0LA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:references:in-reply-to:mime-version :thread-index:date:message-id:subject:to:cc; bh=btYv57KOOxuN81aqKrzzb+qrjGN7bmHVQoqAJFKmd9Y=; b=SHQ1TH8PXyxc0EUlBdmi17OmE8PEcpUUP9ThktRsbJNHc9guj1itbXUxM2BCIGxxEu Kv2LY8f+eeJRuil6Px3UvFowOjMQt+ZwXLigEt0P7kOom7yD3WHesaDm5NQNr998kZ14 RalDguDCIw11lbCbRlO9STaLaPFelehcZjDZnVCifDUluMRXITlxIO2kn9pAqdI5I5yx rPkubK5AcKpwwUV+4rFlkd7KFQl9vY6yJZLQJxHA4IVcAExhWl3nxMPtPrOw4zJslWGa 274ez7n0/7YNqhhQJdVFe3dt4kA6/7iol1etaPPIZwEXEhvr5VaY6BYzbxSSpuIR4Qbu qoqg== X-Gm-Message-State: AOAM5331MeNHQYH2H5GWvxlQO3TwEM5Lb9M0211JIN7yjs/cA6k78ZEK vlPYOGG9Mns5wpHIRd+wdL4I4KUj7PWzzWY5cRpsxHlU14DtlQ== X-Google-Smtp-Source: ABdhPJwxUNR6AqyfX1Tm8SZqD5nc4PrrhqvrSzxFpkzGWZGZ7Mwmnrs6Xr0T8o88O+0VTCLcXGFlfUgAMcFGLoXksdY= X-Received: by 2002:a05:620a:1265:: with SMTP id b5mr21298118qkl.27.1606727869369; Mon, 30 Nov 2020 01:17:49 -0800 (PST) From: Kashyap Desai References: <20201015133702.62879-1-kashyap.desai@broadcom.com> <494a87e9-2994-0965-e5d5-56f2a3b13f0b@suse.de> <2dae79b3-2083-75e0-73fc-ab52c5546bc8@huawei.com> In-Reply-To: <2dae79b3-2083-75e0-73fc-ab52c5546bc8@huawei.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQGJzrs5sdJlHzBIQISuMRxkJPRbMwFhrIVoAbP+U7mqYaWsAA== Date: Mon, 30 Nov 2020 14:47:47 +0530 Message-ID: Subject: RE: [PATCH v1 2/3] megaraid_sas: iouring iopoll support To: John Garry , Hannes Reinecke , linux-scsi@vger.kernel.org Cc: Sumit Saxena , Chandrakanth Patil , linux-block@vger.kernel.org Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000ec7c8705b54f7b04" Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org --000000000000ec7c8705b54f7b04 Content-Type: text/plain; charset="UTF-8" > -----Original Message----- > From: John Garry [mailto:john.garry@huawei.com] > Sent: Friday, November 20, 2020 2:03 PM > To: Hannes Reinecke ; Kashyap Desai > ; linux-scsi@vger.kernel.org > Cc: sumit.saxena@broadcom.com; chandrakanth.patil@broadcom.com; > linux-block@vger.kernel.org > Subject: Re: [PATCH v1 2/3] megaraid_sas: iouring iopoll support > > On 20/11/2020 07:14, Hannes Reinecke wrote: > >> > >> struct rdpq_alloc_detail rdpq_tracker[RDPQ_MAX_CHUNK_COUNT]; > >> > > The usage of atomic_add_unless() is a bit unusual; one might consider > > using atomic_test_and_set(). Also it seems to be a bit of a waste > > using an atomic counter here, seeing that the only values ever used > > are 0 and 1. But this is largely cosmetic, so: > > atomic_add_unless() is generally implemented with a cmpxchg(), which can > be inefficient also. John - Noted. I was able to get expected performance on multiple host using atomic_add_() API. We can improve based on any real time issue. Is it fine ? @Hannes - I will add Reviewed-by Tag in V2 series. > > John --000000000000ec7c8705b54f7b04 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQRQYJKoZIhvcNAQcCoIIQNjCCEDICAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2aMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA tpZok2X9LAHsYqMNVL+Ly6RDkaKar7GD8rVtb9nw6tzPFnvXGeOEA4X5xh9wjx9sScVpGR5wkTg1 fgJIXTlrGESmaqXIdPRd9YQ+Yx9xRIIIPu3Jp/bpbiZBKYDJSbr/2Xago7sb9nnfSyjTSnucUcIP ZVChn6hKneVGBI2DT9yyyD3PmCEJmEzA8Y96qT83JmVH2GaPSSbCw0C+Zj1s/zqtKUbwE5zh8uuZ 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