October 2008 - Darwin-kernel

Re: New to kernel programming... Hope to see something from the console
by Herb Petschauer 09 Oct '08

09 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=29gix9pwNnNmzuTx7WHuNwBzl+KGnVwSwuA5nF482ps=; b=cGdQXctrsdXKf4tUtsYsqQBF1p0yzYKbIKxVxtn7Elii3OeSMZPSakvJI5Mesjtswo BzXg+QNYN+RFUtoDU1gZGHEjENZwgLH50/PsYGKjh/Kez7pzgYyAk4a/ase5DKxU8Ldm v8Tw02JCn1IAaq+Hfd7m+e4QL0SY07eJmIlvU= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=oIY4LiGxsGsjJ1nI4Ec8bp7+yrU087guCM7zAz4pGpiW+6EK8gcWiYnNY8Uay39QzR LqUNVeYm1I8RVdLGBiXoxQtvMR1qLXkbZLS/Cn10rp9RPDmWO3O8Fu3gpojgWX9KPxzK mbvBkK3YWhxaYzuC6iu4c6Z635PaF14l4Gtks= 2008/10/9 Cloud Strife <geforce8800(a)gmail.com>: > Hi everyone. > I am new to Mach kernel programming. Currently I am writing a dummy driver > from the following guidance: > http://developer.apple.com/documentation/Darwin/Conceptual/KEXTConcept/KEXT… > > After wrote the code and compiled them, I set the owner and the privilege of > the kext, and loaded it by > "kextload -t myIOKitDriver.kext". > The terminal prompted I had successfully loaded the kext. I am expecting to > see some information come out from the console. However, the expected > message: > " IOLog("Initializing\n");" does not appear. > Can anyone tell me why the IOLog don't show up? And is there any way to > correct this? > Thank you very much for any help. > Have a good day. :-) > -- > Best regards. Use kextstat to see if your kext was loaded kextstat | grep com.whatever.bundleinfo.youused Sometimes IOLog() gets lost in the works... I usually have a second window open with a "tail -f /var/log" command running to capture an logging (that or the Console.app) or system messages. I've switched to FireWire and kprintf (much nicer but it requires two machines, search the archives). Does kextunload complain that there is nothing to unload? Good luck! -H. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: New to kernel programming... Hope to see something from the console
by mm w 09 Oct '08

09 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=w1tpv3dOuqcp7EhzByrWlOJUiCuELiPFr3dlq7oAjVM=; b=Eptsopl0Wl4QYu5Z+GjdCg65CyoyFx8oiek8mA07iI+P79rhO4HktWNZ5HCkvxhGTf eOvBXXCE2K0EjxtqhHVcy6Eh6BKv+05Orlb4fsECmVclF9FEx2drc9jU+b2gh4NV9J7k n6Y2ql7MSUrj68hUnQDGWrcav8AP+U4S9ZQpU= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=O8yIVuxYiaJ90aR5QoSVtHb6uAFvaCnqq+04aSdk5ItuTbMevFcMD1Wdu3luT87+pJ I2cAeXFKYlwrlfyhjVaNLxwtETcJ6L8N3GBkQDJnISdYrZWp+qbwobjHxvVHHToIxM3C I54aHhlyebVB69SJ3bttVXDWO10gBs6SElc9s= Hi /Applications/Utilities/Console.app see also the difference between printf and uprintf I think with that you should be able to reach your way alone Cheers! On Thu, Oct 9, 2008 at 3:03 AM, Cloud Strife <geforce8800(a)gmail.com> wrote: > Hi everyone. > I am new to Mach kernel programming. Currently I am writing a dummy driver > from the following guidance: > http://developer.apple.com/documentation/Darwin/Conceptual/KEXTConcept/KEXT… > > After wrote the code and compiled them, I set the owner and the privilege of > the kext, and loaded it by > "kextload -t myIOKitDriver.kext". > The terminal prompted I had successfully loaded the kext. I am expecting to > see some information come out from the console. However, the expected > message: > " IOLog("Initializing\n");" does not appear. > Can anyone tell me why the IOLog don't show up? And is there any way to > correct this? > Thank you very much for any help. > Have a good day. :-) > -- > Best regards. > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/openspecies%40gmail.com > > This email sent to openspecies(a)gmail.com > -- -mmw _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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New to kernel programming... Hope to see something from the console
by Cloud Strife 09 Oct '08

09 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type; bh=TCm5zY/IVbRsnduHL/NeP1KrybTGQOMB6alI77EJKhg=; b=SV43E5vWxwR3FQywCnWCPTF7wGHAS3jJXgG5dIfxK/rA9GUkYXQ54kUi8WyJJiWPAY 5H0n340qFxMEW7IeYxYp0DHVE9ybFGxtgRm48R1MYtFu7CQdqkpOynjiD5J81CS4ttiu hYphDMjS+K7rjarCZob+Mk1Rj7cekyZ0wtHcU= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=SYCFvJ5DhZ3Z+g/xWeoVuYb8+mlDCWOAoh0Lwl+smH+Td3UzcbckwOhG8nA0/TpWxg +9ANqNRJJp3ctq00NA1aEm6uB9AkquDTDguOYdtdsFmDWoXy3WkMx7VOoItRt/2PNVbf jCyNJj0urFgVSC5ob3ZAvhEtvLASI1T02yn2w= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: xnu-1228.7.58 build failure
by William Siegrist 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com http://darwinbuild.macosforge.org/trac/newticket -Bill On Oct 8, 2008, at 8:59 AM, Michael Reeves wrote: Yes. If there's an easier way I'll try it. On Oct 8, 2008, at 10:57 AM, William Siegrist wrote: Are you using DarwinBuild to do this? -Bill On Oct 8, 2008, at 7:50 AM, Michael Reeves wrote: The output file from these is never created. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com The latest rev of DarwinBuild replaces dsymutil with true inside the chroot in order to break a dependency on libauto which is not open source. You can manually copy dsymutil back into the chroot, but you'll also need to copy /usr/lib/libauto.dylib. I did not believe a dsymutil failure would break any builds, as others here have also stated, but you could file a ticket with DarwinBuild for this: For some reseason these to commands are generating no output not even an error: /usr/bin/dsymutil --arch=ppc /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys -o /private/var/ tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.sys.dSYM > / dev/null /usr/bin/dsymutil --arch=i386 /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys -o /private/var/ tmp/xnu/xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > / dev/null On Oct 8, 2008, at 9:43 AM, Michael Reeves wrote: smime.p7s

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Re: xnu-1228.7.58 build failure
by Michael Reeves 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-Id:From:To:In-Reply-To:Content-Type:Content-Transfer-Encoding:Mime-Version:Subject:Date:References:X-Mailer; b=6g6OciT0qJqFCFhlUzJayGef/b1dGyVDRDDfC+eMF7B1aOjQOW0KNLwBtc8Sp5TUDzXvnvaaUtTxAKdrB1QCXPeg2l77Kbf+RzemT0P3TbYgb1Qy6U2L4LC2Z1TebxOdVoE3S/HdFPSNPTX9arUgXFy+9my04THIGjqG4dMjMLM= ; Yes. If there's an easier way I'll try it. On Oct 8, 2008, at 10:57 AM, William Siegrist wrote: Are you using DarwinBuild to do this? -Bill On Oct 8, 2008, at 7:50 AM, Michael Reeves wrote: The output file from these is never created. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… For some reseason these to commands are generating no output not even an error: /usr/bin/dsymutil --arch=ppc /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys -o /private/var/ tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.sys.dSYM > /dev/ null /usr/bin/dsymutil --arch=i386 /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys -o /private/var/ tmp/xnu/xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > / dev/null On Oct 8, 2008, at 9:43 AM, Michael Reeves wrote: This email sent to site_archiver(a)lists.apple.com

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Re: xnu-1228.7.58 build failure
by William Siegrist 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Are you using DarwinBuild to do this? -Bill On Oct 8, 2008, at 7:50 AM, Michael Reeves wrote: The output file from these is never created. On Oct 8, 2008, at 9:43 AM, Michael Reeves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com For some reseason these to commands are generating no output not even an error: /usr/bin/dsymutil --arch=ppc /private/var/tmp/xnu/xnu-1228.7.58.obj/ RELEASE_I386/./mach_kernel.sys -o /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > /dev/null /usr/bin/dsymutil --arch=i386 /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys -o /private/var/tmp/ xnu/xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > /dev/null It terminates with the fallowing error: /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.sys.dSYM/./Contents/ Resources/DWARF//mach_kernel.sys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.sym/mach_kernel] Error 1 make[2]: *** Waiting for unfinished jobs.... WARNING: ctfmerge: Can't read input file /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/*/RELEASE/*.*o.ctf: No such file or directory ERROR: ctfmerge: Some input files were inaccessible Removing /private/var/tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/./ mach_kernel.ctfsys /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.ctfsys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.root/mach_kernel] Error 1 make[1]: *** [build_install] Error 2 make: *** [install] Error 2 The ctfconvert error is the only other error in the build log. Looking in resulting build directory reveals that the make seems to using an in correct path for mach_kernel.sys which is at /private/ var/tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/ . The file mach_kernel.sys.dSYM exits only in private/var/tmp/xnu/ xnu-1228.7.58.sym and does not contain mach_kernel.sys but instead has mach_kernel at the same relitive location within the package. I will investigate further. I wanted to make sure the ctfconvert error was symptomatic of something else. smime.p7s

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Re: xnu-1228.7.58 build failure
by Michael Reeves 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-Id:From:To:In-Reply-To:Content-Type:Content-Transfer-Encoding:Mime-Version:Subject:Date:References:X-Mailer; b=SgrgTRyxn0AYWysVG3cpfZ13g9eRQVIPmfJ8IB1Y5gOWYCMJGLmDeezWhSHjJf0tEG11N3ZzK+jaxuhbCw+FLhyKQPDC8/QRwi1PvP2DqpM+KNSh1+yYXlqngJcr010q2y4fFIZbOmG/dpiHZywDx4aLl9Oj+QxaUI+akKIplhc= ; The output file from these is never created. On Oct 8, 2008, at 9:43 AM, Michael Reeves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… For some reseason these to commands are generating no output not even an error: /usr/bin/dsymutil --arch=ppc /private/var/tmp/xnu/xnu-1228.7.58.obj/ RELEASE_I386/./mach_kernel.sys -o /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > /dev/null /usr/bin/dsymutil --arch=i386 /private/var/tmp/xnu/xnu-1228.7.58.obj/ RELEASE_I386/./mach_kernel.sys -o /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_I386/./mach_kernel.sys.dSYM > /dev/null It terminates with the fallowing error: /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.sys.dSYM/./Contents/ Resources/DWARF//mach_kernel.sys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.sym/mach_kernel] Error 1 make[2]: *** Waiting for unfinished jobs.... WARNING: ctfmerge: Can't read input file /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/*/RELEASE/*.*o.ctf: No such file or directory ERROR: ctfmerge: Some input files were inaccessible Removing /private/var/tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/./ mach_kernel.ctfsys /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.ctfsys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.root/mach_kernel] Error 1 make[1]: *** [build_install] Error 2 make: *** [install] Error 2 The ctfconvert error is the only other error in the build log. Looking in resulting build directory reveals that the make seems to using an in correct path for mach_kernel.sys which is at /private/ var/tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/ . The file mach_kernel.sys.dSYM exits only in private/var/tmp/xnu/ xnu-1228.7.58.sym and does not contain mach_kernel.sys but instead has mach_kernel at the same relitive location within the package. I will investigate further. I wanted to make sure the ctfconvert error was symptomatic of something else. On Oct 8, 2008, at 1:12 AM, nawcom wrote: This email sent to site_archiver(a)lists.apple.com

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Re: xnu-1228.7.58 build failure
by Michael Reeves 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-Id:From:To:In-Reply-To:Content-Type:Content-Transfer-Encoding:Mime-Version:Subject:Date:References:X-Mailer; b=A3fEHbQaWv+f1VSRnO6pU3OtMMyPOx+4bypOljhMheDo3OJCOZpAoGOEcyuE4uVw5gw65b1OOtap9Gfa5IG7FHPSc2wemnFHGkYH4juYFAcFJMXYWMnsZWIjbnv0kB/Jlqfa/wsaOb0rWeQRnXBm9s58AfjCm0hO8Czrp0w62H4= ; On Oct 8, 2008, at 1:12 AM, nawcom wrote: Shantonu Sent from my MacBook _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… It terminates with the fallowing error: /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.sys.dSYM/./Contents/ Resources/DWARF//mach_kernel.sys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.sym/mach_kernel] Error 1 make[2]: *** Waiting for unfinished jobs.... WARNING: ctfmerge: Can't read input file /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/*/RELEASE/*.*o.ctf: No such file or directory ERROR: ctfmerge: Some input files were inaccessible Removing /private/var/tmp/xnu/xnu-1228.7.58.obj/RELEASE_PPC/./ mach_kernel.ctfsys /usr/bin/lipo: can't open replacement file: /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/./mach_kernel.ctfsys (No such file or directory) make[2]: *** [/private/var/tmp/xnu/xnu-1228.7.58.root/mach_kernel] Error 1 make[1]: *** [build_install] Error 2 make: *** [install] Error 2 The ctfconvert error is the only other error in the build log. Looking in resulting build directory reveals that the make seems to using an in correct path for mach_kernel.sys which is at /private/var/tmp/xnu/ xnu-1228.7.58.obj/RELEASE_PPC/ . The file mach_kernel.sys.dSYM exits only in private/var/tmp/xnu/xnu-1228.7.58.sym and does not contain mach_kernel.sys but instead has mach_kernel at the same relitive location within the package. I will investigate further. I wanted to make sure the ctfconvert error was symptomatic of something else. is that error killing the entire build process? ctfconvert is only needed for dtrace support in the kernel afaik. mv /usr/local/bin/ ctfconvert /usr/local/bin/ctfconvert.bak or however you want to hide it if it's causing issues. it should report that cftconvert is missing and will report it and continue over it whenever the makefile tries to use it. that will help you find out what the real issue is, if it isn't directly related to it. -Ben Shantonu Sen wrote: ctfconvert is never fatal to the overall build. Your issue is somewhere else. Please find the compiler invocation error in your build log On Oct 4, 2008, at 8:10 PM, Michael Reeves wrote: This email sent to site_archiver(a)lists.apple.com

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Re: xnu-1228.7.58 build failure
by nawcom 08 Oct '08

08 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.17 (Macintosh/20080914) Shantonu Sent from my MacBook On Oct 4, 2008, at 8:10 PM, Michael Reeves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/nawcom%40nawcom.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… is that error killing the entire build process? ctfconvert is only needed for dtrace support in the kernel afaik. mv /usr/local/bin/ctfconvert /usr/local/bin/ctfconvert.bak or however you want to hide it if it's causing issues. it should report that cftconvert is missing and will report it and continue over it whenever the makefile tries to use it. that will help you find out what the real issue is, if it isn't directly related to it. -Ben Shantonu Sen wrote: ctfconvert is never fatal to the overall build. Your issue is somewhere else. Please find the compiler invocation error in your build log Has anyone gotten xnu-1228.7.58 to build with darwin tools? I keep getting ERROR: ctfconvert: failed to initialize DWARF: DW_DLE_ELF_STRPTR_ERROR 30 a call to elf_strptr() failed trying to get a section name I am building from 10.5.5. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ssen%40apple.com This email sent to ssen(a)apple.com This email sent to nawcom(a)nawcom.com This email sent to site_archiver(a)lists.apple.com

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Re: MLock errors on Intel 8-core systems
by Terry Lambert 06 Oct '08

06 Oct '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com So this raises a few questions: No idea. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On Oct 4, 2008, at 4:30 PM, Tony Scaminaci wrote: I'm the author of memtestosx and I recently started receiving reports of mlock failures in single-user mode. Specifically, I've had 3 users report that mlock fails to lock more than 4GB of memory in a single process. I see in the mlock man pages that this indeed appears to be the limit and that a few new error codes were added since the last time I did any work with mlock. However, the strange thing is that this error is only appearing on 8-core Intel machines. I've received no reports of problems from any other users. Here's the error returned by memtest which is mlock error code EAGAIN: Mac OS X 10.5.4 (9E25) running in single user mode Memory Page Size: 4096 System has 8 Intel core(s) with SSE Requested memory: 9756MB (10230386688 bytes) Available memory: 9756MB (10230386688 bytes) NOTE: Memory request is too large, reducing to acceptable value... Allocated memory: 9483MB (9943935808 bytes) at local address 0x0000000101000000 Attempting memory lock... ERROR: System or per-process limit exceeded - reducing and trying again... Users are reporting that reducing the requested test allocation to 4GB rather than all installed ram allows mlock to succeed on the 8- core systems. 1. Why is this error only occuring on 8-core systems? 2. Why is there a lock limit of 4GB now when there hasn't been in the past? I've had many users with 16GB of installed ram who never saw this error on other platforms. Or maybe the limit has always been there and is only manifesting itself on the 8-core machines? Because each mapping range is limited to 4G. We could have made it work by causing multiple mapping ranges to be iterated, but we didn't. In general, we view mlock as a necessary-for-UNIX-conformance evil. If you want to lock a larger region than 4G, you'll need to call it multiple times. 3. Is locking memory for mass testing even necessary in single-user mode? Would I be better off skipping the mlock process for single- user runs? I don't think you will be able to identify the faulty chips from an mlocked region, since the addresses are virtual and you will have a hard time figuring out the correspondance. That said, if the regions are locked, the physical/virtual mapping will not move around on you or get paged, and ou are more likely to get a reproducible result. This email sent to site_archiver(a)lists.apple.com

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