linux-toradex.git/lib/show_mem.c, branch v3.10.78

mm, show_mem: suppress page counts in non-blockable contexts

2013-04-29T22:54:28+00:00

On large systems with a lot of memory, walking all RAM to determine page
types may take a half second or even more.

In non-blockable contexts, the page allocator will emit a page allocation
failure warning unless __GFP_NOWARN is specified.  In such contexts, irqs
are typically disabled and such a lengthy delay may even result in NMI
watchdog timeouts.

To fix this, suppress the page walk in such contexts when printing the
page allocation failure warning.

Signed-off-by: David Rientjes 
Cc: Mel Gorman 
Acked-by: Michal Hocko 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arch, mm: filter disallowed nodes from arch specific show_mem functions

2011-05-25T15:39:03+00:00

Architectures that implement their own show_mem() function did not pass
the filter argument to show_free_areas() to appropriately avoid emitting
the state of nodes that are disallowed in the current context.  This patch
now passes the filter argument to show_free_areas() so those nodes are now
avoided.

This patch also removes the show_free_areas() wrapper around
__show_free_areas() and converts existing callers to pass an empty filter.

ia64 emits additional information for each node, so skip_free_areas_zone()
must be made global to filter disallowed nodes and it is converted to use
a nid argument rather than a zone for this use case.

Signed-off-by: David Rientjes 
Cc: Russell King 
Cc: Tony Luck 
Cc: Fenghua Yu 
Cc: Kyle McMartin 
Cc: Helge Deller 
Cc: James Bottomley 
Cc: "David S. Miller" 
Cc: Guan Xuetao 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib, arch: add filter argument to show_mem and fix private implementations

2011-03-25T00:49:37+00:00

Commit ddd588b5dd55 ("oom: suppress nodes that are not allowed from
meminfo on oom kill") moved lib/show_mem.o out of lib/lib.a, which
resulted in build warnings on all architectures that implement their own
versions of show_mem():

	lib/lib.a(show_mem.o): In function `show_mem':
	show_mem.c:(.text+0x1f4): multiple definition of `show_mem'
	arch/sparc/mm/built-in.o:(.text+0xd70): first defined here

The fix is to remove __show_mem() and add its argument to show_mem() in
all implementations to prevent this breakage.

Architectures that implement their own show_mem() actually don't do
anything with the argument yet, but they could be made to filter nodes
that aren't allowed in the current context in the future just like the
generic implementation.

Reported-by: Stephen Rothwell 
Reported-by: James Bottomley 
Suggested-by: Andrew Morton 
Signed-off-by: David Rientjes 
Signed-off-by: Linus Torvalds

oom: suppress nodes that are not allowed from meminfo on oom kill

2011-03-23T00:44:01+00:00

The oom killer is extremely verbose for machines with a large number of
cpus and/or nodes.  This verbosity can often be harmful if it causes other
important messages to be scrolled from the kernel log and incurs a
signicant time delay, specifically for kernels with CONFIG_NODES_SHIFT >
8.

This patch causes only memory information to be displayed for nodes that
are allowed by current's cpuset when dumping the VM state.  Information
for all other nodes is irrelevant to the oom condition; we don't care if
there's an abundance of memory elsewhere if we can't access it.

This only affects the behavior of dumping memory information when an oom
is triggered.  Other dumps, such as for sysrq+m, still display the
unfiltered form when using the existing show_mem() interface.

Additionally, the per-cpu pageset statistics are extremely verbose in oom
killer output, so it is now suppressed.  This removes

	nodes_weight(current->mems_allowed) * (1 + nr_cpus)

lines from the oom killer output.

Callers may use __show_mem(SHOW_MEM_FILTER_NODES) to filter disallowed
nodes.

Signed-off-by: David Rientjes 
Cc: Mel Gorman 
Cc: KAMEZAWA Hiroyuki 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: use the same log level for show_mem()

2010-03-06T19:26:27+00:00

Use the same log level for printk's in show_mem(), so that those messages
can be shown completely when using log level 6.

Signed-off-by: WANG Cong 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lib: generic show_mem()

2008-07-26T19:00:10+00:00

This implements a platform-independent version of show_mem().

Signed-off-by: Johannes Weiner 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Haavard Skinnemoen 
Cc: Bryan Wu 
Cc: Chris Zankel 
Cc: Ingo Molnar 
Cc: Jeff Dike 
Cc: David S. Miller 
Cc: Paul Mundt 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: David Howells 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Yoshinori Sato 
Cc: Ralf Baechle 
Cc: Greg Ungerer 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: Hirokazu Takata 
Cc: Mikael Starvik 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds