January 2012 - Darwin-dev - lists.apple.com

Method to be notified of IP address changes
by Mark E. Armstrong 28 Jan '12

28 Jan '12

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Re: Process virtual memory cleanup takes quite a lot of time
by Greg Parker 24 Jan '12

24 Jan '12

On Jan 24, 2012, at 12:53 AM, Alexander Potapenko wrote: > The following program: > > ===================== > $ cat p.c > #include <sys/mman.h> > int main() { > void *t = mmap(0, 0x00000fffffffffffUL, PROT_READ| PROT_WRITE, > MAP_ANON | MAP_PRIVATE | MAP_NORESERVE, -1, 0); > } > ===================== > > runs for half a second on my 64-bit Snow Leopard machine: > ===================== > $ time ./p > > real 0m0.545s > user 0m0.000s > sys 0m0.544s > ===================== > > According to Shark, most of the time is spent in pmap_remove at exit time: Do you get better performance on Lion? If I recall correctly, SnowLeopard's kernel data structures do not efficiently handle memory mappings that are significantly larger than 4 GB. -- Greg Parker gparker(a)apple.com Runtime Wrangler _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Process virtual memory cleanup takes quite a lot of time
by Alexander Potapenko 24 Jan '12

24 Jan '12

Hi all, The following program: ===================== $ cat p.c #include <sys/mman.h> int main() { void *t = mmap(0, 0x00000fffffffffffUL, PROT_READ| PROT_WRITE, MAP_ANON | MAP_PRIVATE | MAP_NORESERVE, -1, 0); } ===================== runs for half a second on my 64-bit Snow Leopard machine: ===================== $ time ./p real 0m0.545s user 0m0.000s sys 0m0.544s ===================== According to Shark, most of the time is spent in pmap_remove at exit time: ===================== # Report 5 - session_008.mshark - Time Profile of PID #98012 SharkProfileViewer # Generated from the visible portion of the outline view + 59.9%, pmap_remove, mach_kernel | + 59.9%, vm_map_lookup_locked, mach_kernel | | + 59.9%, vm_map_remove, mach_kernel | | | + 59.9%, task_terminate_internal, mach_kernel | | | | + 59.9%, exit1, mach_kernel | | | | | + 59.9%, exit, mach_kernel | | | | | | 59.9%, unix_syscall64, mach_kernel - 12.0%, pmap64_pde, mach_kernel - 10.7%, pmap64_pdpt, mach_kernel - 5.0%, vm_map_lookup_locked, mach_kernel - 2.7%, zalloc_canblock, mach_kernel - 2.2%, pmap_pde, mach_kernel - 1.8%, lck_mtx_lock_spin, mach_kernel - 1.6%, vm_map_entry_insert, mach_kernel - 1.0%, lck_mtx_unlock_darwin10, mach_kernel - 0.5%, hw_lock_to, mach_kernel ===================== This surprises me, because I thought that a process teardown should be rather cheap (it actually is on Linux). Is it possible to somehow help the kernel with that from the userspace? Rationale: AddressSanitizer (http://code.google.com/p/address-sanitizer/) an LLVM-based tool for memory bugs detection, maps such a huge amount of memory to shadow the address space of the process being debugged. For large applications (like Chrome or WebKit) the virtual page table lookups are not noticeable at all. But our test suite that runs hundreds of tests each doing a fork+exec one by one is very slow because of that. TIA, Alexander Potapenko Software Engineer Google Moscow -- Alexander Potapenko Software Engineer Google Moscow _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Passing configurable parameters into a kext
by Andrew White 24 Jan '12

24 Jan '12

-- Andrew White _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com Situation: I have a driver kext, and I want that kext's behaviour to be configurable over reboot. Is there a well-defined API for saving "preferences" that can then be loaded by the kext at boot time? Obviously, I could write something that modified the driver's Info.plist properties or created a preference file somewhere, but I was wondering if there is an "official" way to do this?

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Re: Installer failing in 10.7
by Jens Alfke 18 Jan '12

18 Jan '12

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Re: Installer failing in 10.7
by Stephane Sudre 18 Jan '12

18 Jan '12

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=NBA9wFe50haDYRw8k7BRxwmnycT+XpXfjz+8+K3ttsU=; b=QQavtA5ywsZ1XAilOn8aeUGVCIIDZgB09273rBTyJuCItBJ0N59PDXwG/o24l+FghB VCsuD/l1yPtriCz6FbVN9aw7ZzFjD3B4ccuor51gHzSMMYHAqnyH8tv9Fk5JpofBfCxd dlPASATqhzPjMRRNLdkNt59muit3oIQMNm/+o= I'n not saying the idea I'm suggesting is good but it would probably solve your issue: 1. Add a Cocoa launchd agent to your solution with its only purpose in life being to open the application, wait a bit and quit. And the launch of the agent is triggered by a modification of a file at a specific location. 2. During the update process, touch the file at the specific location. On Tue, Jan 17, 2012 at 11:32 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: > Hi Jens, > > Thank you very much. > > I have an app and a daemon which are installed on system using my installer. > In postinstall script, it runs command "open /Applications/MyApp.app" and it > works. If this app is already installed and I install new version, it > upgrades smoothly. The daemon (client) is keep polling on server for an > updated version. If it finds then it downloads the dmg file, mounts it and > spawns a new process to run the installer. In preupgrade script, it kills > both processes and remove plist of daemon. It works properly with 10.5 and > 10.6 but gives error on 10.7. The error is "./postinstall: > LSOpenURLsWithRole() failed with error -10810 for the file > /Applications/MyApp.app". > > > com.apple.launchd System: This API can only be used by a process running > within an Aqua session. > open spawn_via_launchd() failed, errno=5 label=..... > path=/Applications/MyApp.app/ > Contents/MacOS/MyApp flags=0 > > I hope, you get an idea that what I am trying to do. > > Regards, > rksinghal > > > > On Wed, Jan 18, 2012 at 11:49 AM, Jens Alfke <jens(a)mooseyard.com> wrote: >> >> >> On Jan 17, 2012, at 7:55 PM, Rakesh Singhal wrote: >> >> Thanks. Yes, its happening due to launching of GUI from daemon. But I can >> not use per-user agent process. I am trying to get some workaround. >> >> >> It’s a security/stability restriction in the OS: you can’t make changes to >> a user session from outside the session. From that perspective, I’m not sure >> why I would want a daemon outside my login session updating my apps — that’s >> something I’d like to have control over. Most apps use something like >> Sparkle, that checks for an update when the app is launched. By comparison, >> I really dislike the system some Google apps use, where it checks for >> updates and nags me to install them even if I’m not using the app at all. >> >> Maybe if you provide more detail about how the whole update system is >> supposed to work, we can suggest some sort of workaround. >> >> —Jens > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/dev.iceberg%40gmail.com > > This email sent to dev.iceberg(a)gmail.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Installer failing in 10.7
by Rakesh Singhal 18 Jan '12

18 Jan '12

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Re: Installer failing in 10.7
by Jens Alfke 18 Jan '12

18 Jan '12

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Re: Installer failing in 10.7
by Rakesh Singhal 18 Jan '12

18 Jan '12

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Re: Installer failing in 10.7
by Jens Alfke 17 Jan '12

17 Jan '12

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