From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933656AbeDXOEB (ORCPT ); Tue, 24 Apr 2018 10:04:01 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:37819 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933353AbeDXOD4 (ORCPT ); Tue, 24 Apr 2018 10:03:56 -0400 Subject: Re: [PATCH] ALSA: hda: Request driver probe from an async task To: Takashi Iwai Cc: Jaroslav Kysela , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org References: <92d47260-8d68-15f9-02b5-9846f9957106@molgen.mpg.de> From: Paul Menzel Message-ID: <56165337-caed-e8d3-1908-c7894911a645@molgen.mpg.de> Date: Tue, 24 Apr 2018 16:03:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms020704030306010107090501" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms020704030306010107090501 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Takashi, On 04/24/18 14:15, Takashi Iwai wrote: > On Tue, 24 Apr 2018 13:59:58 +0200, > Paul Menzel wrote: >> On 04/23/18 14:33, Takashi Iwai wrote: >>> On Mon, 23 Apr 2018 14:30:36 +0200, Paul Menzel wrote: >> >>>> On 04/23/18 14:21, Takashi Iwai wrote: >>>>> On Mon, 23 Apr 2018 14:05:52 +0200, Paul Menzel wrote: >>>>>> >>>>>> From: Paul Menzel >>>>>> Date: Sat, 24 Mar 2018 09:28:43 +0100 >>>>>> >>>>>> On an ASRock E350M1, with Linux 4.17-rc1 according to `initcall_de= bug` >>>>>> calling `azx_driver_init` takes sometimes more than a few millisec= onds, >>>>>> and up to 200 ms. >>>>>> >>>>>> ``` >>>>>> [ 2.892598] calling azx_driver_init+0x0/0xfe4 [snd_hda_intel] = @ 218 >>>>>> [ 2.943002] initcall azx_driver_init+0x0/0xfe4 [snd_hda_intel] >>>>>> returned 0 after 49195 usecs >>>>>> ``` >>>>>> >>>>>> Trying to execute the Linux kernel in less than 500 ms, this is qu= ite a >>>>>> hold-up, and therefore request the probe from an async task. >>>>>> >>>>>> With this change, the test shows, that the function returns earlie= r. >>>>>> >>>>>> ``` >>>>>> [ 3.254800] calling azx_driver_init+0x0/0xfe4 [snd_hda_intel] = @ 227 >>>>>> [ 3.254887] initcall azx_driver_init+0x0/0xfe4 [snd_hda_intel] >>>>>> returned 0 after 66 usecs >>>>>> ``` >>>>>> >>>>>> The same behavior is visible on a Dell OptiPlex 7010. The longer t= imes >>>>>> seem to happen, when the module *e1000e* is probed during the same= time. >>>>>> >>>>>> Signed-off-by: Paul Menzel >>>>> >>>>> What actually took so long? Could you analyze further instead of >>>>> blindly putting the flag? >>>> >>>> Well, I am not sure. Could you please give me hints, how to debug th= is >>>> further? Is there some debug flag? >>> >>> Usually perf would help, but even a simple printk() should suffice to= >>> see what's going on there :) >> >> Please find the messages for a 23 ms run below, and the debug patch >> attached. >> >>> [ 2.996238] calling azx_driver_init+0x0/0xfe4 [snd_hda_intel] @ 2= 14 >>> [ 3.009838] calling rtl8169_pci_driver_init+0x0/0x1000 [r8169] @ = 217 >>> [ 3.009904] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded >>> [ 3.010721] random: get_random_bytes called from ipv6_regen_rndid+= 0x2c/0x100 with crng_init=3D1 >>> [ 3.011283] r8169 0000:03:00.0 eth0: RTL8168e/8111e at 0x(ptrval),= bc:5f:f4:c8:d3:98, XID 0c200000 IRQ 26 >>> [ 3.011289] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 = bytes, tx checksumming: ko] >>> [ 3.013876] initcall rtl8169_pci_driver_init+0x0/0x1000 [r8169] re= turned 0 after 3917 usecs >>> [ 3.031754] calling pcspkr_platform_driver_init+0x0/0x1000 [pcspk= r] @ 221 >>> [ 3.031904] input: PC Speaker as /devices/platform/pcspkr/input/in= put4 >>> [ 3.032288] initcall pcspkr_platform_driver_init+0x0/0x1000 [pcspk= r] returned 0 after 508 usecs >>> [ 3.034795] calling psmouse_init+0x0/0x7c [psmouse] @ 220 >>> [ 3.034903] initcall psmouse_init+0x0/0x7c [psmouse] returned 0 af= ter 87 usecs >>> [ 3.043051] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.043154] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.043187] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.043198] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.043229] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.043265] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.043429] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.043479] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.043749] random: get_random_bytes called from key_alloc+0x1fc/0= x5e0 with crng_init=3D1 >>> [ 3.043973] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.045483] random: get_random_u32 called from arch_rnd.part.2+0x1= 8/0x40 with crng_init=3D1 >>> [ 3.045501] random: get_random_u32 called from load_elf_binary+0x7= 6a/0x1d20 with crng_init=3D1 >>> [ 3.045507] random: get_random_u32 called from arch_align_stack+0x= 45/0x70 with crng_init=3D1 >>> [ 3.045528] random: get_random_u32 called from arch_rnd.part.2+0x1= 8/0x40 with crng_init=3D1 >>> [ 3.045558] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.045771] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.046127] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.046197] calling pcsp_init+0x0/0x1000 [snd_pcsp] @ 221 >>> [ 3.046206] Error: Driver 'pcspkr' is already registered, aborting= =2E.. >>> [ 3.046337] initcall pcsp_init+0x0/0x1000 [snd_pcsp] returned -16 = after 128 usecs >>> [ 3.046348] random: get_random_u32 called from arch_align_stack+0x= 45/0x70 with crng_init=3D1 >>> [ 3.046363] random: get_random_bytes called from load_elf_binary+0= xaf8/0x1d20 with crng_init=3D1 >>> [ 3.046383] random: get_random_u32 called from randomize_page+0x42= /0x57 with crng_init=3D1 >>> [ 3.047312] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.048151] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.048638] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.054325] random: get_random_u32 called from copy_process.part.3= 3+0x186/0x2100 with crng_init=3D1 >>> [ 3.054371] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.067344] usb usb3: New USB device found, idVendor=3D1d6b, idPro= duct=3D0001, bcdDevice=3D 4.17 >>> [ 3.067350] usb usb3: New USB device strings: Mfr=3D3, Product=3D2= , SerialNumber=3D1 >>> [ 3.067353] usb usb3: Product: OHCI PCI host controller >>> [ 3.067356] usb usb3: Manufacturer: Linux 4.17.0-rc2+ ohci_hcd >>> [ 3.067359] usb usb3: SerialNumber: 0000:00:12.0 >>> [ 3.067850] random: get_random_u32 called from cache_random_seq_cr= eate+0xa3/0x1f0 with crng_init=3D1 >>> [ 3.067864] hub 3-0:1.0: USB hub found >>> [ 3.067960] hub 3-0:1.0: 5 ports detected >>> [ 3.068141] random: get_random_u32 called from cache_alloc_refill+= 0x5bb/0x13d0 with crng_init=3D1 >>> [ 3.068618] 1 >>> [ 3.068644] 2 >>> [ 3.068953] 3 >>> [ 3.068954] 4 >>> [ 3.068955] 5 >>> [ 3.068959] 6 >>> [ 3.068960] 7 >>> [ 3.068966] 8 >>> [ 3.068967] 9 >>> [ 3.069204] 1 >>> [ 3.069217] 2 >>> [ 3.069565] 3 >>> [ 3.069566] 4 >>> [ 3.069567] 5 >>> [ 3.069568] 6 >>> [ 3.069569] 7 >>> [ 3.069581] 8 >>> [ 3.069583] 9 >>> [ 3.069774] random: get_random_u32 called from copy_process.part.3= 3+0x186/0x2100 with crng_init=3D1 >>> [ 3.069924] initcall azx_driver_init+0x0/0xfe4 [snd_hda_intel] ret= urned 0 after 23153 usecs >> >> Unfortunately, it looks like the time stamps of the Linux kernel and >> the initcall_debug time do not match. From the Linux time stamps it >> should be 73 ms. >=20 > Indeed. But even from this result, you can have a rough idea. > As you can see, the most of time was spent before "1" point, which is > the very beginning of azx_probe(). That is, the slowness is not in > HD-audio driver probe itself. Rather it's likely because of parallel > probing with other multiple devices. I agree. But that also makes it clear, that the probe can be done in=20 async task, doesn=E2=80=99t it? Kind regards, Paul --------------ms020704030306010107090501 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG Ti1WZXJlaW4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAMtg1/9moUHN0vqHl4pzq5lN6mc5WqFggEcVToyVsuXPztNXS43O+FZs FVV2B+pG/cgDRWM+cNSrVICxI5y+NyipCf8FXRgPxJiZN7Mg9mZ4F4fCnQ7MSjLnFp2uDo0p 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