Messages in this thread | | | From | Mike Frysinger <> | Date | Sat, 28 Nov 2009 13:47:26 -0500 | Subject | Re: [uClinux-dev] [PATCH] FDPIC: respect PT_GNU_STACK exec markings when creating NOMMU stack |
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On Sat, Nov 28, 2009 at 10:24, Mike Frysinger wrote: > The current code will load the stack size and markings, but then only use > the markings in the MMU code path. The NOMMU code path always passes EXEC > to the mmap() call. While this doesn't matter to most people during the > run of the code, it causes a pointless icache flush when starting every > FDPIC application and by default, that tends to be 128kB of waste.
for some raw numbers: with my default FDPIC boot (inetd/syslog/watchdog), we icache flush 18,562,124 bytes. with this stack fix, we cut off 3,538,944 bytes (19% shrinkage). -mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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