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Fri, 02 Oct 2020 09:54:09 -0700 (PDT) Subject: Re: [PATCH v5 11/15] misc: bcm-vk: add BCM_VK_QSTATS To: Florian Fainelli , Arnd Bergmann , Greg Kroah-Hartman , Olof Johansson Cc: Kees Cook , linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Desmond Yan References: <20201001012810.4172-1-scott.branden@broadcom.com> <20201001012810.4172-12-scott.branden@broadcom.com> <5d76c89d-f53a-be22-dcd7-7854a3e1e034@broadcom.com> <0fb4556e-91bf-d364-c7bb-c876136b3991@gmail.com> From: Scott Branden Message-ID: <15206a8d-81f5-f63a-6d0b-178112bf6380@broadcom.com> Date: Fri, 2 Oct 2020 09:54:02 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <0fb4556e-91bf-d364-c7bb-c876136b3991@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000004dd37605b0b2fb83" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000004dd37605b0b2fb83 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-CA On 2020-10-01 3:13 p.m., Florian Fainelli wrote: > > > On 10/1/2020 3:12 PM, Scott Branden wrote: >> >> >> On 2020-09-30 7:33 p.m., Florian Fainelli wrote: >>> >>> >>> On 9/30/2020 6:28 PM, Scott Branden wrote: >>>> Add BCM_VK_QSTATS Kconfig option to allow for enabling debug VK >>>> queue statistics. >>>> >>>> These statistics keep track of max, abs_max, and average for the >>>> messages queues. >>>> >>>> Co-developed-by: Desmond Yan >>>> Signed-off-by: Desmond Yan >>>> Signed-off-by: Scott Branden >>>> --- >>> >>> [snip] >>> >>>> +#if defined(CONFIG_BCM_VK_QSTATS) >>>> +    /* clear qstats */ >>>> +    for (i = 0; i < VK_MSGQ_MAX_NR; i++) { >>>> +        memset(&vk->to_v_msg_chan.qstats[i].qcnts, 0, >>>> +               sizeof(vk->to_v_msg_chan.qstats[i].qcnts)); >>>> +        memset(&vk->to_h_msg_chan.qstats[i].qcnts, 0, >>>> +               sizeof(vk->to_h_msg_chan.qstats[i].qcnts)); >>>> +    } >>>> +#endif >>>>        /* clear 4096 bits of bitmap */ >>>>        bitmap_clear(vk->bmap, 0, VK_MSG_ID_BITMAP_SIZE); >>> >>> It was not clear from looking at this patch how are the statistics exposed and how does one actually get them? >> The QSTATS, since it is only for debug purpose, it will dump out periodically based on processed_num. >> Nothing fancy as we only compile it in in extreme case for recreating a scenario. > > But what kind of interface is that? Cannot you at least expose those through sysfs if nothing else? A sysfs interface would not be as useful as we want the dmesg timestamp information. QSTATS are purely for development/debug issues and enabled via a CONFIG option that won't be turned on by normal users.  Will change to dev_dbg. --0000000000004dd37605b0b2fb83 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 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