[patch 1/3] powerpc: Move 64bit VDSO to improve context switch performance
schwab at linux-m68k.org
Sun Oct 4 00:15:38 EST 2009
Andreas Schwab <schwab at linux-m68k.org> writes:
> Anton Blanchard <anton at samba.org> writes:
>> On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
>> is position independent we can remove the hint and let get_unmapped_area pick
>> an area.
> This breaks gdb. The section table in the VDSO image when mapped into
> the process no longer contains meaningful values, and gdb rejects it.
The problem is that the load segment requires 64k alignment, but the
page allocater of course only provides PAGE_SIZE alignment, causing the
image to be unaligned in memory.
Andreas Schwab, schwab at linux-m68k.org
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