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Benjamin Herrenschmidt d0f13e3c20 [POWERPC] Introduce address space "slices" ... The basic issue is to be able to do what hugetlbfs does but with different page sizes for some other special filesystems; more specifically, my need is: - Huge pages - SPE local store mappings using 64K pages on a 4K base page size kernel on Cell - Some special 4K segments in 64K-page kernels for mapping a dodgy type of powerpc-specific infiniband hardware that requires 4K MMU mappings for various reasons I won't explain here. The main issues are: - To maintain/keep track of the page size per "segment" (as we can only have one page size per segment on powerpc, which are 256MB divisions of the address space). - To make sure special mappings stay within their allotted "segments" (including MAP_FIXED crap) - To make sure everybody else doesn't mmap/brk/grow_stack into a "segment" that is used for a special mapping Some of the necessary mechanisms to handle that were present in the hugetlbfs code, but mostly in ways not suitable for anything else. The patch relies on some changes to the generic get_unmapped_area() that just got merged. It still hijacks hugetlb callbacks here or there as the generic code hasn't been entirely cleaned up yet but that shouldn't be a problem. So what is a slice ? Well, I re-used the mechanism used formerly by our hugetlbfs implementation which divides the address space in "meta-segments" which I called "slices". The division is done using 256MB slices below 4G, and 1T slices above. Thus the address space is divided currently into 16 "low" slices and 16 "high" slices. (Special case: high slice 0 is the area between 4G and 1T). Doing so simplifies significantly the tracking of segments and avoids having to keep track of all the 256MB segments in the address space. While I used the "concepts" of hugetlbfs, I mostly re-implemented everything in a more generic way and "ported" hugetlbfs to it. Slices can have an associated page size, which is encoded in the mmu context and used by the SLB miss handler to set the segment sizes. The hash code currently doesn't care, it has a specific check for hugepages, though I might add a mechanism to provide per-slice hash mapping functions in the future. The slice code provide a pair of "generic" get_unmapped_area() (bottomup and topdown) functions that should work with any slice size. There is some trickiness here so I would appreciate people to have a look at the implementation of these and let me know if I got something wrong. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>		18 years ago
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acpi	PNPACPI sets pnpdev->dev.archdata	18 years ago
asm-alpha	Remove tas()	18 years ago
asm-arm	Remove tas()	18 years ago
asm-arm26	Remove tas()	18 years ago
asm-avr32	Clean up mostly unused IOSPACE macros	18 years ago
asm-blackfin	Remove tas()	18 years ago
asm-cris	move die notifier handling to common code	18 years ago
asm-frv	FRV: Miscellaneous fixes	18 years ago
asm-generic	local_t: architecture independent extension	18 years ago
asm-h8300	Remove tas()	18 years ago
asm-i386	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	18 years ago
asm-ia64	local_t: ia64 extension	18 years ago
asm-m32r	Remove tas()	18 years ago
asm-m68k	m68k: <asm/scatterlist.h> needs <linux/types.h>	18 years ago
asm-m68knommu	Remove tas()	18 years ago
asm-mips	Remove tas()	18 years ago
asm-parisc	local_t: parisc cleanup	18 years ago
asm-powerpc	[POWERPC] Introduce address space "slices"	18 years ago
asm-ppc	Remove tas()	18 years ago
asm-s390	Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6	18 years ago
asm-sh	Remove tas()	18 years ago
asm-sh64	Remove tas()	18 years ago
asm-sparc	[SPARC]: Wire up utimensat syscall.	18 years ago
asm-sparc64	[SPARC64]: Optimize fault kprobe handling just like powerpc.	18 years ago
asm-um	x86: create asm/cmpxchg.h	18 years ago
asm-v850	Remove tas()	18 years ago
asm-x86_64	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	18 years ago
asm-xtensa	Remove tas()	18 years ago
crypto	[CRYPTO] cryptd: Add software async crypto daemon	18 years ago
keys	[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both	18 years ago
linux	[POWERPC] swsusp: Introduce register_nosave_region_late	18 years ago
math-emu	Delete unused header file math-emu/extended.h	18 years ago
media	i2c: Cleanup the includes of <linux/i2c.h>	18 years ago
mtd	UBI: Unsorted Block Images	18 years ago
net	cleanup compat ioctl handling	18 years ago
pcmcia	add new_id to PCMCIA drivers	18 years ago
rdma	Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband	18 years ago
rxrpc	[AF_RXRPC]: Delete the old RxRPC code.	18 years ago
scsi	[SCSI] sas_scsi_host: Convert to use the kthread API	18 years ago
sound	[ALSA] version 1.0.14rc3	18 years ago
video	atyfb: halve XCLK with Mobility and 32bit memory	18 years ago
Kbuild	…