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Date: Thu, 25 Jan 2007 23:47:39 +0000 (GMT) From: Mel Gorman <mel@....ul.ie> To: linux-mm@...ck.org Cc: Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org Subject: [PATCH 8/8] Add documentation for additional boot parameter and sysctl Once all patches are applied, a new command-line parameter exist and a new sysctl. This patch adds the necessary documentation. Signed-off-by: Mel Gorman <mel@....ul.ie> --- filesystems/proc.txt | 15 +++++++++++++++ kernel-parameters.txt | 16 ++++++++++++++++ sysctl/vm.txt | 3 ++- 3 files changed, 33 insertions(+), 1 deletion(-) diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/filesystems/proc.txt linux-2.6.20-rc4-mm1-008_documentation/Documentation/filesystems/proc.txt --- linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/filesystems/proc.txt 2007-01-07 05:45:51.000000000 +0000 +++ linux-2.6.20-rc4-mm1-008_documentation/Documentation/filesystems/proc.txt 2007-01-25 18:27:28.000000000 +0000 @@ -1288,6 +1288,21 @@ nr_hugepages configures number of hugetl hugetlb_shm_group contains group id that is allowed to create SysV shared memory segment using hugetlb page. +hugepages_treat_as_movable +-------------------------- + +This paramter is only useful when kernelcore= is specified at boot time to +create ZONE_MOVABLE for pages that may be reclaimed or migrated. Huge pages +are not movable so are not normally allocated from ZONE_MOVABLE. A non-zero +value written to hugepages_treat_as_movable allows huge pages to be allocated +from ZONE_MOVABLE. + +Once enabled, the ZONE_MOVABLE is treated as an area of memory the huge +pages pool can easily grow or shrink within. Assuming that applications are +not running that mlock() a lot of memory, it is likely the huge pages pool +can grow to the size of ZONE_MOVABLE by repeatly entering the desired value +into nr_hugepages and triggering page reclaim. + laptop_mode ----------- diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/kernel-parameters.txt linux-2.6.20-rc4-mm1-008_documentation/Documentation/kernel-parameters.txt --- linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/kernel-parameters.txt 2007-01-17 17:07:54.000000000 +0000 +++ linux-2.6.20-rc4-mm1-008_documentation/Documentation/kernel-parameters.txt 2007-01-25 18:27:28.000000000 +0000 @@ -762,6 +762,22 @@ and is between 256 and 4096 characters. js= [HW,JOY] Analog joystick See Documentation/input/joystick.txt. + kernelcore=nn[KMG] [KNL,IA-32,IA-64,PPC,X86-64] This parameter + specifies the amount of memory usable by the kernel + for non-movable allocations. The requested amount is + spread evenly throughout all nodes in the system. The + remaining memory in each node is used for Movable + pages. In the event, a node is too small to have both + kernelcore and Movable pages, kernelcore pages will + take priority and other nodes will have a larger number + of kernelcore pages. The Movable zone is used for the + allocation of pages that may be reclaimed or moved + by the page migration sybsystem. This means that + HugeTLB pages may not be allocated from this zone. + Note that allocations like PTEs-from-HighMem still + use the HighMem zone if it exists, and the Normal + zone if it does not. + keepinitrd [HW,ARM] kstack=N [IA-32,X86-64] Print N words from the kernel stack diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/sysctl/vm.txt linux-2.6.20-rc4-mm1-008_documentation/Documentation/sysctl/vm.txt --- linux-2.6.20-rc4-mm1-007_ia64_set_kernelcore/Documentation/sysctl/vm.txt 2007-01-17 17:07:54.000000000 +0000 +++ linux-2.6.20-rc4-mm1-008_documentation/Documentation/sysctl/vm.txt 2007-01-25 18:27:28.000000000 +0000 @@ -39,7 +39,8 @@ Currently, these files are in /proc/sys/ dirty_ratio, dirty_background_ratio, dirty_expire_centisecs, dirty_writeback_centisecs, vfs_cache_pressure, laptop_mode, -block_dump, swap_token_timeout, drop-caches: +block_dump, swap_token_timeout, drop-caches, +hugepages_treat_as_movable: See Documentation/filesystems/proc.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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