17 Oct, 2007
40 commits
-
Current ia64 kernel flushes icache by lazy_mmu_prot_update() *after*
set_pte(). This is too late. This patch removes lazy_mmu_prot_update and
add modfied set_pte() for flushing if necessary.This patch flush icache of a page when
new pte has exec bit.
&& new pte has present bit
&& new pte is user's page.
&& (old *ptep is not present
|| new pte's pfn is not same to old *ptep's ptn)
&& new pte's page has no Pg_arch_1 bit.
Pg_arch_1 is set when a page is cache consistent.I think this condition checks are much easier to understand than considering
"Where sync_icache_dcache() should be inserted ?".pte_user() for ia64 was removed by http://lkml.org/lkml/2007/6/12/67 as
clean-up. So, I added it again.Signed-off-by: KAMEZAWA Hiroyuki
Cc: "Luck, Tony"
Cc: Christoph Lameter
Cc: Hugh Dickins
Cc: Nick Piggin
Acked-by: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In migration, a new page should be cache flushed before set_pte() in some
archs which have virtually-tagged cache.Signed-off-by: KAMEZAWA Hiroyuki
Cc: "Luck, Tony"
Cc: Christoph Lameter
Cc: Hugh Dickins
Cc: Nick Piggin
Acked-by: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Swappiness isn't a safe sysctl. Setting it to 0 for example can hang a
system. That's a corner case but even setting it to 10 or lower can waste
enormous amounts of cpu without making much progress. We've customers who
wants to use swappiness but they can't because of the current
implementation (if you change it so the system stops swapping it really
stops swapping and nothing works sane anymore if you really had to swap
something to make progress).This patch from Kurt Garloff makes swappiness safer to use (no more huge
cpu usage or hangs with low swappiness values).I think the prev_priority can also be nuked since it wastes 4 bytes per
zone (that would be an incremental patch but I wait the nr_scan_[in]active
to be nuked first for similar reasons). Clearly somebody at some point
noticed how broken that thing was and they had to add min(priority,
prev_priority) to give it some reliability, but they didn't go the last
mile to nuke prev_priority too. Calculating distress only in function of
not-racy priority is correct and sure more than enough without having to
add randomness into the equation.Patch is tested on older kernels but it compiles and it's quite simple
so...Overall I'm not very satisified by the swappiness tweak, since it doesn't
rally do anything with the dirty pagecache that may be inactive. We need
another kind of tweak that controls the inactive scan and tunes the
can_writepage feature (not yet in mainline despite having submitted it a
few times), not only the active one. That new tweak will tell the kernel
how hard to scan the inactive list for pure clean pagecache (something the
mainline kernel isn't capable of yet). We already have that feature
working in all our enterprise kernels with the default reasonable tune, or
they can't even run a readonly backup with tar without triggering huge
write I/O. I think it should be available also in mainline later.Cc: Nick Piggin
Signed-off-by: Kurt Garloff
Signed-off-by: Andrea Arcangeli
Signed-off-by: Fengguang Wu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The function of GFP_LEVEL_MASK seems to be unclear. In order to clear up
the mystery we get rid of it and replace GFP_LEVEL_MASK with 3 sets of GFP
flags:GFP_RECLAIM_MASK Flags used to control page allocator reclaim behavior.
GFP_CONSTRAINT_MASK Flags used to limit where allocations can occur.
GFP_SLAB_BUG_MASK Flags that the slab allocator BUG()s on.
These replace the uses of GFP_LEVEL mask in the slab allocators and in
vmalloc.c.The use of the flags not included in these sets may occur as a result of a
slab allocation standing in for a page allocation when constructing scatter
gather lists. Extraneous flags are cleared and not passed through to the
page allocator. __GFP_MOVABLE/RECLAIMABLE, __GFP_COLD and __GFP_COMP will
now be ignored if passed to a slab allocator.Change the allocation of allocator meta data in SLAB and vmalloc to not
pass through flags listed in GFP_CONSTRAINT_MASK. SLAB already removes the
__GFP_THISNODE flag for such allocations. Generalize that to also cover
vmalloc. The use of GFP_CONSTRAINT_MASK also includes __GFP_HARDWALL.The impact of allocator metadata placement on access latency to the
cachelines of the object itself is minimal since metadata is only
referenced on alloc and free. The attempt is still made to place the meta
data optimally but we consistently allow fallback both in SLAB and vmalloc
(SLUB does not need to allocate metadata like that).Allocator metadata may serve multiple in kernel users and thus should not
be subject to the limitations arising from a single allocation context.[akpm@linux-foundation.org: fix fallback_alloc()]
Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When a cpu is onlined on memory-less-node box, kernel panics due to touch
NULL pointer of pgdat->kswapd. Current kswapd runs only nodes which have
memory. So, calling of set_cpus_allowed() is not necessary for memory-less
node.This is fix for it.
Signed-off-by: Yasunori Goto
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Here's a cut at fixing up uses of the online node map in generic code.
mm/shmem.c:shmem_parse_mpol()
Ensure nodelist is subset of nodes with memory.
Use node_states[N_HIGH_MEMORY] as default for missing
nodelist for interleave policy.mm/shmem.c:shmem_fill_super()
initialize policy_nodes to node_states[N_HIGH_MEMORY]
mm/page-writeback.c:highmem_dirtyable_memory()
sum over nodes with memory
mm/page_alloc.c:zlc_setup()
allowednodes - use nodes with memory.
mm/page_alloc.c:default_zonelist_order()
average over nodes with memory.
mm/page_alloc.c:find_next_best_node()
skip nodes w/o memory.
N_HIGH_MEMORY state mask may not be initialized at this time,
unless we want to depend on early_calculate_totalpages() [see
below]. Will ZONE_MOVABLE ever be configurable?mm/page_alloc.c:find_zone_movable_pfns_for_nodes()
spread kernelcore over nodes with memory.
This required calling early_calculate_totalpages()
unconditionally, and populating N_HIGH_MEMORY node
state therein from nodes in the early_node_map[].
If we can depend on this, we can eliminate the
population of N_HIGH_MEMORY mask from __build_all_zonelists()
and use the N_HIGH_MEMORY mask in find_next_best_node().mm/mempolicy.c:mpol_check_policy()
Ensure nodes specified for policy are subset of
nodes with memory.[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Lee Schermerhorn
Acked-by: Christoph Lameter
Cc: Shaohua Li
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
cpusets try to ensure that any node added to a cpuset's mems_allowed is
on-line and contains memory. The assumption was that online nodes contained
memory. Thus, it is possible to add memoryless nodes to a cpuset and then add
tasks to this cpuset. This results in continuous series of oom-kill and
apparent system hang.Change cpusets to use node_states[N_HIGH_MEMORY] [a.k.a. node_memory_map] in
place of node_online_map when vetting memories. Return error if admin
attempts to write a non-empty mems_allowed node mask containing only
memoryless-nodes.Signed-off-by: Lee Schermerhorn
Signed-off-by: Bob Picco
Signed-off-by: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
GFP_THISNODE checks that the zone selected is within the pgdat (node) of the
first zone of a nodelist. That only works if the node has memory. A
memoryless node will have its first node on another pgdat (node).GFP_THISNODE currently will return simply memory on the first pgdat. Thus it
is returning memory on other nodes. GFP_THISNODE should fail if there is no
local memory on a node.Add a new set of zonelists for each node that only contain the nodes that
belong to the zones itself so that no fallback is possible.Then modify gfp_type to pickup the right zone based on the presence of
__GFP_THISNODE.Drop the existing GFP_THISNODE checks from the page_allocators hot path.
Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
get_pfn_range_for_nid() is called multiple times for each node at boot time.
Each time, it will warn about nodes with no memory, resulting in boot messages
like:Node 0 active with no memory
Node 0 active with no memory
Node 0 active with no memory
Node 0 active with no memory
Node 0 active with no memory
Node 0 active with no memory
On node 0 totalpages: 0
Node 0 active with no memory
Node 0 active with no memory
DMA zone: 0 pages used for memmap
Node 0 active with no memory
Node 0 active with no memory
Normal zone: 0 pages used for memmap
Node 0 active with no memory
Node 0 active with no memory
Movable zone: 0 pages used for memmapand so on for each memoryless node.
We already have the "On node N totalpages: ..." and other related messages, so
drop the "Node N active with no memory" warnings.Signed-off-by: Lee Schermerhorn
Cc: Bob Picco
Cc: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We need the check for a node with cpu in zone reclaim. Zone reclaim will not
allow remote zone reclaim if a node has a cpu.[Lee.Schermerhorn@hp.com: Move setup of N_CPU node state mask]
Signed-off-by: Christoph Lameter
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Lee Schermerhorn
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Online nodes now may have no memory. The checks and initialization must
therefore be changed to no longer use the online functions.This will correctly initialize the interleave on bootup to only target nodes
with memory and will make sys_move_pages return an error when a page is to be
moved to a memoryless node. Similarly we will get an error if MPOL_BIND and
MPOL_INTERLEAVE is used on a memoryless node.These are somewhat new semantics. So far one could specify memoryless nodes
and we would maybe do the right thing and just ignore the node (or we'd do
something strange like with MPOL_INTERLEAVE). If we want to allow the
specification of memoryless nodes via memory policies then we need to keep
checking for online nodes.Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Processors on memoryless nodes must be able to fall back to remote nodes in
order to get a profiling buffer. This may lead to excessive NUMA traffic but
I think we should allow this rather than failing.Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Acked-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The checks for node_online in the uncached allocator are made to make sure
that memory is available on these nodes. Thus switch all the checks to use
N_HIGH_MEMORY and to N_ONLINE.Signed-off-by: Christoph Lameter
Signed-off-by: Jes Sorensen
Acked-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Simply switch all for_each_online_node to for_each_node_state(NORMAL_MEMORY).
That way SLUB only operates on nodes with regular memory. Any allocation
attempt on a memoryless node or a node with just highmem will fall whereupon
SLUB will fetch memory from a nearby node (depending on how memory policies
and cpuset describe fallback).Signed-off-by: Christoph Lameter
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Slab should not allocate control structures for nodes without memory. This
may seem to work right now but its unreliable since not all allocations can
fall back due to the use of GFP_THISNODE.Switching a few for_each_online_node's to N_NORMAL_MEMORY will allow us to
only allocate for nodes that have regular memory.Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Acked-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
A node without memory does not need a kswapd. So use the memory map instead
of the online map when starting kswapd.Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
constrained_alloc() builds its own memory map for nodes with memory. We have
that available in N_HIGH_MEMORY now. So simplify the code.Signed-off-by: Christoph Lameter
Acked-by: Nishanth Aravamudan
Acked-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
MPOL_INTERLEAVE currently simply loops over all nodes. Allocations on
memoryless nodes will be redirected to nodes with memory. This results in an
imbalance because the neighboring nodes to memoryless nodes will get
significantly more interleave hits that the rest of the nodes on the system.We can avoid this imbalance by clearing the nodes in the interleave node set
that have no memory. If we use the node map of the memory nodes instead of
the online nodes then we have only the nodes we want.Signed-off-by: Christoph Lameter
Signed-off-by: Nishanth Aravamudan
Tested-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
It is necessary to know if nodes have memory since we have recently begun to
add support for memoryless nodes. For that purpose we introduce a two new
node states: N_HIGH_MEMORY and N_NORMAL_MEMORY.A node has its bit in N_HIGH_MEMORY set if it has any memory regardless of the
type of mmemory. If a node has memory then it has at least one zone defined
in its pgdat structure that is located in the pgdat itself.A node has its bit in N_NORMAL_MEMORY set if it has a lower zone than
ZONE_HIGHMEM. This means it is possible to allocate memory that is not
subject to kmap.N_HIGH_MEMORY and N_NORMAL_MEMORY can then be used in various places to insure
that we do the right thing when we encounter a memoryless node.[akpm@linux-foundation.org: build fix]
[Lee.Schermerhorn@hp.com: update N_HIGH_MEMORY node state for memory hotadd]
[y-goto@jp.fujitsu.com: Fix memory hotplug + sparsemem build]
Signed-off-by: Lee Schermerhorn
Signed-off-by: Nishanth Aravamudan
Signed-off-by: Christoph Lameter
Acked-by: Bob Picco
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Yasunori Goto
Signed-off-by: Paul Mundt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Why do we need to support memoryless nodes?
KAMEZAWA Hiroyuki wrote:
> For fujitsu, problem is called "empty" node.
>
> When ACPI's SRAT table includes "possible nodes", ia64 bootstrap(acpi_numa_init)
> creates nodes, which includes no memory, no cpu.
>
> I tried to remove empty-node in past, but that was denied.
> It was because we can hot-add cpu to the empty node.
> (node-hotplug triggered by cpu is not implemented now. and it will be ugly.)
>
>
> For HP, (Lee can comment on this later), they have memory-less-node.
> As far as I hear, HP's machine can have following configration.
>
> (example)
> Node0: CPU0 memory AAA MB
> Node1: CPU1 memory AAA MB
> Node2: CPU2 memory AAA MB
> Node3: CPU3 memory AAA MB
> Node4: Memory XXX GB
>
> AAA is very small value (below 16MB) and will be omitted by ia64 bootstrap.
> After boot, only Node 4 has valid memory (but have no cpu.)
>
> Maybe this is memory-interleave by firmware config.Christoph Lameter wrote:
> Future SGI platforms (actually also current one can have but nothing like
> that is deployed to my knowledge) have nodes with only cpus. Current SGI
> platforms have nodes with just I/O that we so far cannot manage in the
> core. So the arch code maps them to the nearest memory node.Lee Schermerhorn wrote:
> For the HP platforms, we can configure each cell with from 0% to 100%
> "cell local memory". When we configure with improve bandwidth at the expense of latency for numa-challenged
> applications [and OSes, but not our problem ;-)]. When we boot Linux on
> such a config, all of the real nodes have no memory--it all resides in a
> single interleaved pseudo-node.
>
> When we boot Linux on a 100% CLM configuration [== NUMA], we still have
> the interleaved pseudo-node. It contains a few hundred MB stolen from
> the real nodes to contain the DMA zone. [Interleaved memory resides at
> phys addr 0]. The memoryless-nodes patches, along with the zoneorder
> patches, support this config as well.
>
> Also, when we boot a NUMA config with the "mem=" command line,
> specifying less memory than actually exists, Linux takes the excluded
> memory "off the top" rather than distributing it across the nodes. This
> can result in memoryless nodes, as well.
>This patch:
Preparation for memoryless node patches.
Provide a generic way to keep nodemasks describing various characteristics of
NUMA nodes.Remove the node_online_map and the node_possible map and realize the same
functionality using two nodes stats: N_POSSIBLE and N_ONLINE.[Lee.Schermerhorn@hp.com: Initialize N_*_MEMORY and N_CPU masks for non-NUMA config]
Signed-off-by: Christoph Lameter
Tested-by: Lee Schermerhorn
Acked-by: Lee Schermerhorn
Acked-by: Bob Picco
Cc: Nishanth Aravamudan
Cc: KAMEZAWA Hiroyuki
Cc: Mel Gorman
Signed-off-by: Lee Schermerhorn
Cc: "Serge E. Hallyn"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
prepare/commit_write no longer returns AOP_TRUNCATED_PAGE since OCFS2 and
GFS2 were converted to the new aops, so we can make some simplifications
for that.[michal.k.k.piotrowski@gmail.com: fix warning]
Signed-off-by: Nick Piggin
Cc: Michael Halcrow
Cc: Mark Fasheh
Cc: Steven Whitehouse
Signed-off-by: Michal Piotrowski
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Implement nobh in new aops. This is a bit tricky. FWIW, nobh_truncate is
now implemented in a way that does not create blocks in sparse regions,
which is a silly thing for it to have been doing (isn't it?)ext2 survives fsx and fsstress. jfs is converted as well... ext3
should be easy to do (but not done yet).[akpm@linux-foundation.org: coding-style fixes]
Cc: Badari Pulavarty
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Plug ocfs2 into the ->write_begin and ->write_end aops.
A bunch of custom code is now gone - the iovec iteration stuff during write
and the ocfs2 splice write actor.Signed-off-by: Mark Fasheh
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Cc: Roman Zippel
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Acked-by: Russell King
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Acked-by: Dave Kleikamp
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Cc: Andries Brouwer
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Cc: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Convert udf to new aops. Also seem to have fixed pagecache corruption in
udf_adinicb_commit_write -- page was marked uptodate when it is not. Also,
fixed the silly setup where prepare_write was doing a kmap to be used in
commit_write: just do kmap_atomic in write_end. Use libfs helpers to make
this easier.Signed-off-by: Nick Piggin
Cc:
Cc: Jan Kara
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Cc: Evgeniy Dushistov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Cc: David Woodhouse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This also gets rid of a lot of useless read_file stuff. And also
optimises the full page write case by marking a !uptodate page uptodate.Signed-off-by: Nick Piggin
Cc: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
[mszeredi]
- don't send zero length write requests
- it is not legal for the filesystem to return with zero written bytesSigned-off-by: Nick Piggin
Signed-off-by: Miklos Szeredi
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
[akpm@linux-foundation.org: fix against git-nfs]
[peterz@infradead.org: fix against git-nfs]
Signed-off-by: Nick Piggin
Acked-by: Trond Myklebust
Cc: "J. Bruce Fields"
Cc: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch makes reiserfs to use AOP_FLAG_CONT_EXPAND
in order to get rid of the special generic_cont_expand routineSigned-off-by: Vladimir Saveliev
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Convert reiserfs to new aops
Signed-off-by: Vladimir Saveliev
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make reiserfs to write via generic routines.
Original reiserfs write optimized for big writes is deadlock roneSigned-off-by: Vladimir Saveliev
Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Nick Piggin
Acked-by: Anders Larsen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
