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* commit 'origin/master': (4825 commits) Fix build errors due to CONFIG_BRANCH_TRACER=y parport: Use the PCI IRQ if offered tty: jsm cleanups Adjust path to gpio headers KGDB_SERIAL_CONSOLE check for module Change KCONFIG name tty: Blackin CTS/RTS Change hardware flow control from poll to interrupt driven Add support for the MAX3100 SPI UART. lanana: assign a device name and numbering for MAX3100 serqt: initial clean up pass for tty side tty: Use the generic RS485 ioctl on CRIS tty: Correct inline types for tty_driver_kref_get() splice: fix deadlock in splicing to file nilfs2: support nanosecond timestamp nilfs2: introduce secondary super block nilfs2: simplify handling of active state of segments nilfs2: mark minor flag for checkpoint created by internal operation nilfs2: clean up sketch file nilfs2: super block operations fix endian bug ... Conflicts: arch/x86/include/asm/thread_info.h arch/x86/lguest/boot.c drivers/xen/manage.c
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,71 @@ | ||
| What: /sys/kernel/debug/kmemtrace/ | ||
| Date: July 2008 | ||
| Contact: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> | ||
| Description: | ||
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| In kmemtrace-enabled kernels, the following files are created: | ||
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| /sys/kernel/debug/kmemtrace/ | ||
| cpu<n> (0400) Per-CPU tracing data, see below. (binary) | ||
| total_overruns (0400) Total number of bytes which were dropped from | ||
| cpu<n> files because of full buffer condition, | ||
| non-binary. (text) | ||
| abi_version (0400) Kernel's kmemtrace ABI version. (text) | ||
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| Each per-CPU file should be read according to the relay interface. That is, | ||
| the reader should set affinity to that specific CPU and, as currently done by | ||
| the userspace application (though there are other methods), use poll() with | ||
| an infinite timeout before every read(). Otherwise, erroneous data may be | ||
| read. The binary data has the following _core_ format: | ||
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| Event ID (1 byte) Unsigned integer, one of: | ||
| 0 - represents an allocation (KMEMTRACE_EVENT_ALLOC) | ||
| 1 - represents a freeing of previously allocated memory | ||
| (KMEMTRACE_EVENT_FREE) | ||
| Type ID (1 byte) Unsigned integer, one of: | ||
| 0 - this is a kmalloc() / kfree() | ||
| 1 - this is a kmem_cache_alloc() / kmem_cache_free() | ||
| 2 - this is a __get_free_pages() et al. | ||
| Event size (2 bytes) Unsigned integer representing the | ||
| size of this event. Used to extend | ||
| kmemtrace. Discard the bytes you | ||
| don't know about. | ||
| Sequence number (4 bytes) Signed integer used to reorder data | ||
| logged on SMP machines. Wraparound | ||
| must be taken into account, although | ||
| it is unlikely. | ||
| Caller address (8 bytes) Return address to the caller. | ||
| Pointer to mem (8 bytes) Pointer to target memory area. Can be | ||
| NULL, but not all such calls might be | ||
| recorded. | ||
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| In case of KMEMTRACE_EVENT_ALLOC events, the next fields follow: | ||
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| Requested bytes (8 bytes) Total number of requested bytes, | ||
| unsigned, must not be zero. | ||
| Allocated bytes (8 bytes) Total number of actually allocated | ||
| bytes, unsigned, must not be lower | ||
| than requested bytes. | ||
| Requested flags (4 bytes) GFP flags supplied by the caller. | ||
| Target CPU (4 bytes) Signed integer, valid for event id 1. | ||
| If equal to -1, target CPU is the same | ||
| as origin CPU, but the reverse might | ||
| not be true. | ||
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| The data is made available in the same endianness the machine has. | ||
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| Other event ids and type ids may be defined and added. Other fields may be | ||
| added by increasing event size, but see below for details. | ||
| Every modification to the ABI, including new id definitions, are followed | ||
| by bumping the ABI version by one. | ||
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| Adding new data to the packet (features) is done at the end of the mandatory | ||
| data: | ||
| Feature size (2 byte) | ||
| Feature ID (1 byte) | ||
| Feature data (Feature size - 3 bytes) | ||
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| Users: | ||
| kmemtrace-user - git://repo.or.cz/kmemtrace-user.git | ||
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