linux/mm
Meelap Shah c2f1a551de knfsd: nfsd4: vary maximum delegation limit based on RAM size
Our original NFSv4 delegation policy was to give out a read delegation on any
open when it was possible to.

Since the lifetime of a delegation isn't limited to that of an open, a client
may quite reasonably hang on to a delegation as long as it has the inode
cached.  This becomes an obvious problem the first time a client's inode cache
approaches the size of the server's total memory.

Our first quick solution was to add a hard-coded limit.  This patch makes a
mild incremental improvement by varying that limit according to the server's
total memory size, allowing at most 4 delegations per megabyte of RAM.

My quick back-of-the-envelope calculation finds that in the worst case (where
every delegation is for a different inode), a delegation could take about
1.5K, which would make the worst case usage about 6% of memory.  The new limit
works out to be about the same as the old on a 1-gig server.

[akpm@linux-foundation.org: Don't needlessly bloat vmlinux]
[akpm@linux-foundation.org: Make it right for highmem machines]
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:07 -07:00
..
Kconfig CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic 2007-07-17 10:23:02 -07:00
Makefile CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic 2007-07-17 10:23:02 -07:00
allocpercpu.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
backing-dev.c remove mm/backing-dev.c:congestion_wait_interruptible() 2007-07-16 09:05:52 -07:00
bootmem.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
bounce.c block: blk_max_pfn is somtimes wrong 2007-03-27 08:52:47 +02:00
fadvise.c [PATCH] mm: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
filemap.c Fix read/truncate race 2007-07-17 10:22:59 -07:00
filemap.h
filemap_xip.c xip sendfile removal 2007-07-10 08:04:15 +02:00
fremap.c [PATCH] mm: more rmap debugging 2006-12-22 08:55:49 -08:00
highmem.c Create the ZONE_MOVABLE zone 2007-07-17 10:22:59 -07:00
hugetlb.c MM: Make needlessly global hugetlb_no_page() static. 2007-07-17 10:23:02 -07:00
internal.h Make page->private usable in compound pages 2007-05-07 12:12:53 -07:00
madvise.c speed up madvise_need_mmap_write() usage 2007-07-16 09:05:36 -07:00
memory.c Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated 2007-07-17 10:22:59 -07:00
memory_hotplug.c memory hotplug: fix unnecessary calling of init_currenty_empty_zone() 2007-06-01 08:18:29 -07:00
mempolicy.c Allow huge page allocations to use GFP_HIGH_MOVABLE 2007-07-17 10:22:59 -07:00
mempool.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
migrate.c Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated 2007-07-17 10:22:59 -07:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c do not limit locked memory when RLIMIT_MEMLOCK is RLIM_INFINITY 2007-07-16 09:05:37 -07:00
mmap.c split mmap 2007-07-16 09:05:37 -07:00
mmzone.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
mprotect.c
mremap.c security: Protection for exploiting null dereference using mmap 2007-07-11 22:52:29 -04:00
msync.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nommu.c nommu: stub expand_stack() for nommu case 2007-07-16 09:05:37 -07:00
oom_kill.c oom: fix constraint deadlock 2007-05-07 12:12:55 -07:00
page-writeback.c fs: introduce some page/buffer invariants 2007-07-17 10:23:02 -07:00
page_alloc.c knfsd: nfsd4: vary maximum delegation limit based on RAM size 2007-07-17 10:23:07 -07:00
page_io.c [PATCH] swsusp: use block device offsets to identify swap locations 2006-12-07 08:39:27 -08:00
pdflush.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
prio_tree.c
quicklist.c Quicklists for page table pages 2007-05-07 12:12:54 -07:00
readahead.c readahead: code cleanup 2007-05-07 12:12:52 -07:00
rmap.c mm: kill validate_anon_vma to avoid mapcount BUG 2007-06-28 11:34:53 -07:00
shmem.c knfsd: exportfs: add exportfs.h header 2007-07-17 10:23:06 -07:00
shmem_acl.c
slab.c kallsyms: make KSYM_NAME_LEN include space for trailing '\0' 2007-07-17 10:23:03 -07:00
slob.c Slab allocators: Cleanup zeroing allocations 2007-07-17 10:23:01 -07:00
slub.c SLUB: Fix CONFIG_SLUB_DEBUG use for CONFIG_NUMA 2007-07-17 10:23:02 -07:00
sparse.c Move three functions that are only needed for CONFIG_MEMORY_HOTPLUG 2007-06-08 17:23:33 -07:00
swap.c Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
swap_state.c Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated 2007-07-17 10:22:59 -07:00
swapfile.c vmscan: fix comments related to shrink_list() 2007-07-16 09:05:35 -07:00
thrash.c Bug in mm/thrash.c function grab_swap_token() 2007-05-11 08:29:32 -07:00
tiny-shmem.c [PATCH] mm/{,tiny-}shmem.c cleanups 2007-03-01 14:53:35 -08:00
truncate.c fs: introduce some page/buffer invariants 2007-07-17 10:23:02 -07:00
util.c Slab allocators: Cleanup zeroing allocations 2007-07-17 10:23:01 -07:00
vmalloc.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
vmscan.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
vmstat.c Create the ZONE_MOVABLE zone 2007-07-17 10:22:59 -07:00