Bill Irwin <[EMAIL PROTECTED]> writes: > > Only 1GB-aligned kernel/user splits are now handled for PAE. The > 2GB/2GB split attempts to avoid aliasing vmallocspace with the 1:1 > mapping for physical memory by using an actual split of 1.875/2.125 > to accommodate 128MB of vmallocspace out of what would otherwise > be a full 2GB for userspace. That attempt disturbs the alignment > required by PAE for 2GB/2GB splits, and furthermore does not provide > a 2GB/2GB split as advertised. > > This patch resolves the issues here in two manners. The first is > by providing a true 2GB/2GB split in addition to the 1.875/2.125 > split. The second is by renaming the 1.875/2.125 split to > CONFIG_VMSPLIT_2G_OPT analogously to CONFIG_VMSPLIT_3G_OPT, which > performs a similar manuever to avoid aliasing vmallocspace with > the 1:1 mapping for physical memory around the 3GB boundary. With > the 1.875/2.125 split properly-named, its config option is then > tagged as depending on !HIGHMEM to express the PAE implementation's > current inability to deal with such unaligned splits. > > This patch is essentially a combination of two patches, one written > by Eric Biederman and the other by Eric Dumazet. If they could add > their Signed-off-by: to this, I'd be much obliged. > > Signed-off-by: William Irwin <[EMAIL PROTECTED]> > Cc: Eric Dumazet <[EMAIL PROTECTED]> > Cc: Mark Lord <[EMAIL PROTECTED]> > Cc: Eric W. Biederman <[EMAIL PROTECTED]> > Cc: Andi Kleen <[EMAIL PROTECTED]>
Acked-by: "Eric W. Biederman" <[EMAIL PROTECTED]> > > > Index: sched/arch/i386/Kconfig > =================================================================== > --- sched.orig/arch/i386/Kconfig 2007-05-01 04:35:47.065162310 -0700 > +++ sched/arch/i386/Kconfig 2007-05-01 04:36:50.100754504 -0700 > @@ -571,6 +571,9 @@ > bool "3G/1G user/kernel split (for full 1G low memory)" > config VMSPLIT_2G > bool "2G/2G user/kernel split" > + config VMSPLIT_2G_OPT > + depends on !HIGHMEM > + bool "2G/2G user/kernel split (for full 2G low memory)" > config VMSPLIT_1G > bool "1G/3G user/kernel split" > endchoice > @@ -578,7 +581,8 @@ > config PAGE_OFFSET > hex > default 0xB0000000 if VMSPLIT_3G_OPT > - default 0x78000000 if VMSPLIT_2G > + default 0x80000000 if VMSPLIT_2G > + default 0x78000000 if VMSPLIT_2G_OPT > default 0x40000000 if VMSPLIT_1G > default 0xC0000000 > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
