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linux-next/Documentation/ABI/testing
Nishanth Aravamudan a343787016 hugetlb: new sysfs interface
Provide new hugepages user APIs that are more suited to multiple hstates
in sysfs.  There is a new directory, /sys/kernel/hugepages.  Underneath
that directory there will be a directory per-supported hugepage size,
e.g.:

/sys/kernel/hugepages/hugepages-64kB
/sys/kernel/hugepages/hugepages-16384kB
/sys/kernel/hugepages/hugepages-16777216kB

corresponding to 64k, 16m and 16g respectively.  Within each
hugepages-size directory there are a number of files, corresponding to the
tracked counters in the hstate, e.g.:

/sys/kernel/hugepages/hugepages-64/nr_hugepages
/sys/kernel/hugepages/hugepages-64/nr_overcommit_hugepages
/sys/kernel/hugepages/hugepages-64/free_hugepages
/sys/kernel/hugepages/hugepages-64/resv_hugepages
/sys/kernel/hugepages/hugepages-64/surplus_hugepages

Of these files, the first two are read-write and the latter three are
read-only.  The size of the hugepage being manipulated is trivially
deducible from the enclosing directory and is always expressed in kB (to
match meminfo).

[dave@linux.vnet.ibm.com: fix build]
[nacc@us.ibm.com: hugetlb: hang off of /sys/kernel/mm rather than /sys/kernel]
[nacc@us.ibm.com: hugetlb: remove CONFIG_SYSFS dependency]
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:17 -07:00
..
debugfs-pktcdvd [PATCH] pktcdvd: cleanup 2007-02-11 10:51:28 -08:00
procfs-diskstats Enhanced partition statistics: documentation update 2008-02-08 12:42:11 +01:00
sysfs-block block: Data integrity infrastructure documentation 2008-07-03 13:21:13 +02:00
sysfs-bus-css [S390] cio: Introduce modalias for css bus. 2008-07-14 10:02:05 +02:00
sysfs-bus-pci PCI: Expose PCI VPD through sysfs 2008-04-20 21:47:07 -07:00
sysfs-bus-usb USB: Add documentation for USB suspend statistics. 2008-02-01 14:35:00 -08:00
sysfs-class [PATCH] Add kernel<->userspace ABI stability documentation 2006-06-21 12:40:47 -07:00
sysfs-class-bdi fuse: fix bdi naming conflict 2008-05-24 09:56:07 -07:00
sysfs-class-pktcdvd [PATCH] pktcdvd: cleanup 2007-02-11 10:51:28 -08:00
sysfs-dev sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor 2008-07-21 21:54:40 -07:00
sysfs-devices [PATCH] Add kernel<->userspace ABI stability documentation 2006-06-21 12:40:47 -07:00
sysfs-firmware-acpi ACPI: Enhance /sys/firmware/interrupts to allow enable/disable/clear from user-space 2008-07-16 23:27:04 +02:00
sysfs-firmware-memmap sysfs: add /sys/firmware/memmap 2008-07-08 17:55:41 +02:00
sysfs-ibft Firmware: add iSCSI iBFT Support 2008-04-19 19:10:28 -07:00
sysfs-kernel-mm mm: create /sys/kernel/mm 2008-07-24 10:47:17 -07:00
sysfs-kernel-mm-hugepages hugetlb: new sysfs interface 2008-07-24 10:47:17 -07:00
sysfs-kernel-uids Documentation: create new scheduler/ subdirectory 2008-02-07 08:42:17 -08:00
sysfs-ocfs2 ocfs2: Document /sys/fs/ocfs2 2008-04-18 08:56:07 -07:00
sysfs-power [PATCH] swsusp: debugging 2006-11-03 12:27:58 -08:00