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Steven Rostedt 3eefae994d ftrace: limit trace entries 
Currently there is no protection from the root user to use up all of
memory for trace buffers. If the root user allocates too many entries,
the OOM killer might start kill off all tasks.

This patch adds an algorith to check the following condition:

 pages_requested > (freeable_memory + current_trace_buffer_pages) / 4

If the above is met then the allocation fails. The above prevents more
than 1/4th of freeable memory from being used by trace buffers.

To determine the freeable_memory, I made determine_dirtyable_memory in
mm/page-writeback.c global.

Special thanks goes to Peter Zijlstra for suggesting the above calculation.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 		2008-05-23 22:05:14 +02:00
..
acpi ACPICA: update Intel copyright 2008-04-23 23:00:13 -04:00
asm-alpha asm-{alpha,h8300,um,v850,xtensa}/param.h: unbreak HZ for userspace 2008-05-14 19:11:14 -07:00
asm-arm Merge branch 'omap-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 2008-05-17 22:56:29 +01:00
asm-avr32 avr32: types: use <asm-generic/int-*.h> for the avr32 architecture 2008-05-02 16:18:20 -07:00
asm-blackfin Blackfin serial driver: add extra IRQ flag for 8250 serial driver 2008-05-17 18:21:57 +08:00
asm-cris cris: types: use <asm-generic/int-*.h> for the cris architecture 2008-05-02 16:18:20 -07:00
asm-frv read_barrier_depends arch fixlets 2008-05-14 10:05:18 -07:00
asm-generic types: add C99-style constructors to <asm-generic/int-*.h> 2008-05-02 16:18:42 -07:00
asm-h8300 asm-{alpha,h8300,um,v850,xtensa}/param.h: unbreak HZ for userspace 2008-05-14 19:11:14 -07:00
asm-ia64 KVM: ia64: Set KVM_IOAPIC_NUM_PINS to 48 2008-05-18 14:34:16 +03:00
asm-m32r m32r: types: use <asm-generic/int-*.h> for the m32r architecture 2008-05-02 16:18:21 -07:00
asm-m68k m68k: Prefix ISA type with ISA_TYPE_ 2008-05-18 13:28:50 -07:00
asm-m68knommu m68knommu: rework definition of HZ 2008-05-01 08:08:36 -07:00
asm-mips [MIPS] Get rid of __ilog2 2008-05-12 16:46:55 +01:00
asm-mn10300 MN10300: Make cpu_relax() invoke barrier() 2008-05-08 10:49:39 -07:00
asm-parisc parisc: use conditional macro for 64-bit wide ops 2008-05-15 11:03:43 -04:00
asm-powerpc [POWERPC] Fix uninitialized variable bug in copy_{to|from}_user 2008-05-15 20:49:52 +10:00
asm-ppc [POWERPC] ppc: More compile fixes 2008-05-12 22:57:51 +10:00
asm-s390 [S390] s390dbf: Use const char * for dbf name. 2008-05-15 16:52:39 +02:00
asm-sh sh: use the common ascii hex helpers 2008-05-16 15:09:08 +09:00
asm-sparc sparc: remove CVS keywords 2008-05-20 00:33:44 -07:00
asm-sparc64 sparc64: Add global register dumping facility. 2008-05-20 00:33:45 -07:00
asm-um asm-{alpha,h8300,um,v850,xtensa}/param.h: unbreak HZ for userspace 2008-05-14 19:11:14 -07:00
asm-v850 asm-{alpha,h8300,um,v850,xtensa}/param.h: unbreak HZ for userspace 2008-05-14 19:11:14 -07:00
asm-x86 x86: add a list for custom page fault handlers. 2008-05-23 21:16:38 +02:00
asm-xtensa asm-{alpha,h8300,um,v850,xtensa}/param.h: unbreak HZ for userspace 2008-05-14 19:11:14 -07:00
crypto [CRYPTO] api: Fix scatterwalk_sg_chain 2008-05-01 18:22:28 +08:00
keys KEYS: Fix the comment to match the file name in rxrpc-type.h. 2008-04-21 22:43:55 +00:00
linux ftrace: limit trace entries 2008-05-23 22:05:14 +02:00
math-emu
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media Fix a deadlock in the bttv driver 2008-05-20 10:12:26 -07:00
mtd
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net Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/linville/wireless-2.6 2008-05-19 16:29:40 -07:00
pcmcia
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rdma IB: expand ib_umem_get() prototype 2008-04-29 08:06:12 -07:00
rxrpc
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scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-05-02 13:52:35 -07:00
sound [ALSA] ASoC: build fix for snd_soc_info_bool_ext 2008-05-13 14:47:44 +02:00
video fbdev: platforming hecubafb and n411 2008-04-28 08:58:41 -07:00
xen xen: add balloon driver 2008-04-24 23:57:33 +02:00
Kbuild
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