diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2005-08-11 16:55:21 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-08-29 10:53:38 +1000 |
| commit | c594adad5653491813959277fb87a2fef54c4e05 (patch) | |
| tree | baefdce10a0b490017b0a5acbe9dbeb8cb14c003 /arch/ppc64/mm/slb_low.S | |
| parent | 9a5573e378c5c8976c6000a7643b52e2a0481688 (diff) | |
| download | op-kernel-dev-c594adad5653491813959277fb87a2fef54c4e05.zip op-kernel-dev-c594adad5653491813959277fb87a2fef54c4e05.tar.gz | |
[PATCH] Dynamic hugepage addresses for ppc64
Paulus, I think this is now a reasonable candidate for the post-2.6.13
queue.
Relax address restrictions for hugepages on ppc64
Presently, 64-bit applications on ppc64 may only use hugepages in the
address region from 1-1.5T. Furthermore, if hugepages are enabled in
the kernel config, they may only use hugepages and never normal pages
in this area. This patch relaxes this restriction, allowing any
address to be used with hugepages, but with a 1TB granularity. That
is if you map a hugepage anywhere in the region 1TB-2TB, that entire
area will be reserved exclusively for hugepages for the remainder of
the process's lifetime. This works analagously to hugepages in 32-bit
applications, where hugepages can be mapped anywhere, but with 256MB
(mmu segment) granularity.
This patch applies on top of the four level pagetable patch
(http://patchwork.ozlabs.org/linuxppc64/patch?id=1936).
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/mm/slb_low.S')
| -rw-r--r-- | arch/ppc64/mm/slb_low.S | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/arch/ppc64/mm/slb_low.S b/arch/ppc64/mm/slb_low.S index f20fc52..bab2558 100644 --- a/arch/ppc64/mm/slb_low.S +++ b/arch/ppc64/mm/slb_low.S @@ -89,28 +89,29 @@ END_FTR_SECTION_IFSET(CPU_FTR_16M_PAGE) b 9f 0: /* user address: proto-VSID = context<<15 | ESID */ - li r11,SLB_VSID_USER - srdi. r9,r3,USER_ESID_BITS bne- 8f /* invalid ea bits set */ #ifdef CONFIG_HUGETLB_PAGE BEGIN_FTR_SECTION - /* check against the hugepage ranges */ - cmpldi r3,(TASK_HPAGE_END>>SID_SHIFT) - bge 6f /* >= TASK_HPAGE_END */ - cmpldi r3,(TASK_HPAGE_BASE>>SID_SHIFT) - bge 5f /* TASK_HPAGE_BASE..TASK_HPAGE_END */ + lhz r9,PACAHIGHHTLBAREAS(r13) + srdi r11,r3,(HTLB_AREA_SHIFT-SID_SHIFT) + srd r9,r9,r11 + andi. r9,r9,1 + bne 5f + + li r11,SLB_VSID_USER + cmpldi r3,16 - bge 6f /* 4GB..TASK_HPAGE_BASE */ + bge 6f - lhz r9,PACAHTLBSEGS(r13) + lhz r9,PACALOWHTLBAREAS(r13) srd r9,r9,r3 andi. r9,r9,1 + beq 6f -5: /* this is a hugepage user address */ - li r11,(SLB_VSID_USER|SLB_VSID_L) +5: li r11,SLB_VSID_USER|SLB_VSID_L END_FTR_SECTION_IFSET(CPU_FTR_16M_PAGE) #endif /* CONFIG_HUGETLB_PAGE */ |
