Also this really does not belong on android-developers. Please move further discussion to android-porting; thanks!
On Thu, Feb 4, 2010 at 8:26 PM, David Turner <di...@android.com> wrote: > As said > > On Thu, Feb 4, 2010 at 7:11 PM, <md.zafar.z...@gmail.com> wrote: > >> Hello David & all, >> Thank you for the information. We're trying this sreadahead( >> http://code.google.com/p/sreadahead/) on ARM based target. As these >> __sync_fetch_and_add_4 & readahead are not part of bionic libc; could you >> please suggest us any alternatives. Or any other technique to reduce bootup >> time ? >> >> > As I said previously, these functions are normally provided by the > toolchain, i.e. the compiler, not the C library. You'll notice that they are > not provided by GLibc either. > You could try to provide your own implementation, which should be simple > to implement on non-SMP ARM systems. > > Incidentally, I doubt that readahead is going to be much help to reduce the > boot time on Android though, since I'm not convinced that the boot sequence > is i/o bound (Flash media is much faster than hard disk drives). I'd love to > be proven wrong though. > > > >> Thanks. >> >> >> On Feb 5, 2010 3:34am, David Turner <di...@android.com> wrote: >> > Googling reveals that __sync_fetch_and_add_4 is an x86 and x86_64 >> specific builtin compiler function. >> > On Thu, Feb 4, 2010 at 4:50 AM, zafar md.zafar.z...@gmail.com> wrote: >> > >> > Trying to use sreadahead tool on android target to decrease bootup >> > >> > time . >> > >> > But sreaahesd.c are not getting compiled against bionic library. >> > >> > Below is the error message--------- >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > /tmp/ccIfKOOt.o: In function `one_thread': >> > >> > /home/zafar/spreadahead/sreadahead-1.0/sreadahead.c:177: undefined >> > >> > reference to `__sync_fetch_and_add_4' >> > >> > /tmp/ccIfKOOt.o: In function `readahead_one': >> > >> > /home/zafar/spreadahead/sreadahead-1.0/sreadahead.c:166: undefined >> > >> > reference to `readahead' >> > >> > /tmp/ccIfKOOt.o: In function `one_thread': >> > >> > /home/zafar/spreadahead/sreadahead-1.0/sreadahead.c:177: undefined >> > >> > reference to `__sync_fetch_and_add_4' >> > >> > collect2: ld returned 1 exit status >> > >> > make: *** [sreadahead] Error 1 >> > >> > >> > >> > >> > >> > >> > >> > Any help will be highly appreciated >> > >> > >> > >> > Thank you >> > >> > >> > >> > -- >> > >> > You received this message because you are subscribed to the Google >> > >> > Groups "Android Developers" group. >> > >> > To post to this group, send email to >> android-developers@googlegroups.com >> > >> > To unsubscribe from this group, send email to >> > >> > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> >> > >> > For more options, visit this group at >> > >> > http://groups.google.com/group/android-developers?hl=en >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > -- >> > >> > You received this message because you are subscribed to the Google >> > >> > Groups "Android Developers" group. >> > >> > To post to this group, send email to >> android-developers@googlegroups.com >> > >> > To unsubscribe from this group, send email to >> > >> > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> >> > >> > For more options, visit this group at >> > >> > http://groups.google.com/group/android-developers?hl=en >> > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
