- 19 Jul, 2007 40 commits
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Peter Zijlstra authored
Ensure that all of the lock dependency tracking code is under CONFIG_PROVE_LOCKING. This allows us to use the held lock tracking code for other purposes. Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by:
Ingo Molnar <mingo@elte.hu> Acked-by:
Jason Baron <jbaron@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Peter Zijlstra authored
Use the lockdep infrastructure to track lock contention and other lock statistics. It tracks lock contention events, and the first four unique call-sites that encountered contention. It also measures lock wait-time and hold-time in nanoseconds. The minimum and maximum times are tracked, as well as a total (which together with the number of event can give the avg). All statistics are done per lock class, per write (exclusive state) and per read (shared state). The statistics are collected per-cpu, so that the collection overhead is minimized via having no global cachemisses. This new lock statistics feature is independent of the lock dependency checking traditionally done by lockdep; it just shares the lock tracking code. It is also possible to enable both and runtime disabled either component - thereby avoiding the O(n^2) lock chain walks for instance. This patch: raw_spinlock_t should not use lockdep (and doesn't) since lockdep itself relies on it. Signed-off-by:
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Jan Harkes authored
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Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by:
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Jan Harkes authored
Similar information can easily be obtained with strace -c. Signed-off-by:
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Jan Harkes authored
The sb_info structure only contains a single pointer to the character device, there is no need for the added indirection. Signed-off-by:
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Jan Harkes authored
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Jan Harkes authored
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Jan Harkes authored
Venus returns an ENOENT error on open, so we shouldn't try to grab the filehandle for the returned fd. Signed-off-by:
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Jan Harkes authored
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Jan Harkes authored
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Jan Harkes authored
We ignore signals for about 30 seconds to give userspace a chance to see the upcall. As we did not block signals we ended up in a busy loop for the remainder of the period when a signal is received. Signed-off-by:
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Jan Harkes authored
Make the code that processes upcall responses more straightforward, uncovered at least one bad assumption. We trusted that vc_inuse would be 0 when upcalls are aborted, however the device may have been reopened. Signed-off-by:
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Jan Harkes authored
- Make sure device index is not a negative number. - Unlink queued requests when the device is closed to avoid passing them to the next opener. Signed-off-by:
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Jan Harkes authored
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Jan Harkes authored
Set MS_NOATIME flag to avoid unnecessary calls when the coda inode is accessed. Also, set statfs.f_bsize to 4k. 1k is obviously too small for the suggested IO size. Signed-off-by:
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Jan Harkes authored
A directory without children may still be busy when it is the cwd for some process. We can safely remove such a directory because the VFS prevents further operations. Also we don't need to call d_delete as it is already called in vfs_rmdir. Signed-off-by:
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Jan Harkes authored
The Coda client sets the directory link count to 1 when it isn't sure how many subdirectories we have. In this case we shouldn't change the link count in the kernel when a subdirectory is created or removed. Signed-off-by:
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Jan Harkes authored
Change the epoch value to forces a refresh instead of clearing the cached rights mask and block all further accesses to the object. Signed-off-by:
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Jan Harkes authored
When open fails the fd in the response is uninitialized and we ended up taking a reference on the file struct and never released it. Signed-off-by:
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Roland McGrath authored
This change passes the --build-id when linking the kernel and when linking modules, if ld supports it. This is a new GNU ld option that synthesizes an ELF note section inside the read-only data. The note in this section contains unique identifying bits called the "build ID", which are generated so as to be different for any two linked ELF files that aren't identical. The build ID can be recovered from stripped files, memory dumps, etc. and used to look up the original program built, locate debuginfo or other details or history associated with it. For normal program linking, the compiler passes --build-id to ld by default, but the option is needed when using ld directly as we do. Signed-off-by:
Roland McGrath <roland@redhat.com> Cc: Andi Kleen <ak@suse.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Roland McGrath authored
This patch adds the /sys/kernel/notes magic file. Reading this delivers the contents of the kernel's .notes section. This lets userland easily glean any detailed information about the running kernel's build that was stored there at compile time. Signed-off-by:
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Roland McGrath authored
This changes the s390 linker script to use the asm-generic NOTES macro so that ELF note sections with SHF_ALLOC set are linked into the kernel image along with other read-only data. The PT_NOTE also points to their location. This paves the way for putting useful build-time information into ELF notes that can be found easily later in a kernel memory dump. Signed-off-by:
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Roland McGrath authored
This changes the powerpc linker script to use the asm-generic NOTES macro so that ELF note sections with SHF_ALLOC set are linked into the kernel image along with other read-only data. The PT_NOTE also points to their location. This paves the way for putting useful build-time information into ELF notes that can be found easily later in a kernel memory dump. Signed-off-by:
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Roland McGrath authored
This changes the alpha linker script to use the asm-generic NOTES macro so that ELF note sections with SHF_ALLOC set are linked into the kernel image along with other read-only data. The PT_NOTE also points to their location. This paves the way for putting useful build-time information into ELF notes that can be found easily later in a kernel memory dump. Signed-off-by:
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Roland McGrath authored
This changes the x86_64 linker script to use the asm-generic NOTES macro so that ELF note sections with SHF_ALLOC set are linked into the kernel image along with other read-only data. The PT_NOTE also points to their location. This paves the way for putting useful build-time information into ELF notes that can be found easily later in a kernel memory dump. Signed-off-by:
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Roland McGrath authored
This changes the i386 linker script and the asm-generic macro it uses so that ELF note sections with SHF_ALLOC set are linked into the kernel image along with other read-only data. The PT_NOTE also points to their location. This paves the way for putting useful build-time information into ELF notes that can be found easily later in a kernel memory dump. Signed-off-by:
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Mingming Cao authored
Looking at the current linus-git tree jbd_debug() define in include/linux/jbd2.h extern u8 journal_enable_debug; #define jbd_debug(n, f, a...) \ do { \ if ((n) <= journal_enable_debug) { \ printk (KERN_DEBUG "(%s, %d): %s: ", \ __FILE__, __LINE__, __FUNCTION__); \ printk (f, ## a); \ } \ } while (0) > fs/ext4/inode.c: In function âext4_write_inodeâ: > fs/ext4/inode.c:2906: warning: comparison is always true due to limited > range of data type > > fs/jbd2/recovery.c: In function âjbd2_journal_recoverâ: > fs/jbd2/recovery.c:254: warning: comparison is always true due to > limited range of data type > fs/jbd2/recovery.c:257: warning: comparison is always true due to > limited range of data type > > fs/jbd2/recovery.c: In function âjbd2_journal_skip_recoveryâ: > fs/jbd2/recovery.c:301: warning: comparison is always true due to > limited range of data type > Noticed all warnings are occurs when the debug level is 0. Then found the "jbd2: Move jbd2-debug file to debugfs" patch http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0f49d5d019afa4e94253bfc92f0daca3badb990b changed the jbd2_journal_enable_debug from int type to u8, makes the jbd_debug comparision is always true when the debugging level is 0. Thus the compile warning occurs. Thought about changing the jbd2_journal_enable_debug data type back to int, but can't, because the jbd2-debug is moved to debug fs, where calling debugfs_create_u8() to create the debugfs entry needs the value to be u8 type. Even if we changed the data type back to int, the code is still buggy, kernel should not print jbd2 debug message if the jbd2_journal_enable_debug is set to 0. But this is not the case. The fix is change the level of debugging to 1. The same should fixed in ext3/JBD, but currently ext3 jbd-debug via /proc fs is broken, so we probably should fix it all together. Signed-off-by:Mingming Cao <cmm@us.ibm.com> Cc: Jeff Garzik <jeff@garzik.org> Cc: Theodore Tso <tytso@mit.edu> Signed-off-by:
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Andy Whitcroft authored
This version brings a number of new checks, and a number of bug fixes. Of note: - warnings for multiple assignments per line - warnings for multiple declarations per line - checks for single statement blocks with braces This patch includes an update for feature-removal-schedule.txt to better target checks. Andy Whitcroft (12): Version: 0.08 only apply printk checks where there is a string literal allow suppression of errors for when no patch is found warn about multiple assignments warn on declaration of multiple variables check for kfree() with needless null check check for single statement braced blocks check for aggregate initialisation on the next line handle the => operator check for spaces between function name and open parenthesis move to explicit Check: entries in feature-removal-schedule.txt handle pointer attributes Signed-off-by:Andy Whitcroft <apw@shadowen.org> Signed-off-by:
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Rolf Eike Beer authored
Signed-off-by:
Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by:
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Ingo Molnar authored
Update the MAINTAINERS file: Thomas Gleixner has been the de-facto maintainer of POSIX timers and clocks for quite some time. Signed-off-by:
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Adrian Bunk authored
Signed-off-by:
Adrian Bunk <bunk@stusta.de> Cc: Tom Zanussi <zanussi@us.ibm.com> Signed-off-by:
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Kawai, Hidehiro authored
This patch adds the documentation for /proc/<pid>/coredump_filter. Signed-off-by:
Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Signed-off-by:
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Kawai, Hidehiro authored
This patch enables core dump filtering for ELF-FDPIC-formatted core file. Signed-off-by:
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Kawai, Hidehiro authored
This patch removes an unused argument from elf_fdpic_dump_segments(). Signed-off-by:
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Kawai, Hidehiro authored
This patch enables core dump filtering for ELF-formatted core file. Signed-off-by:
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Kawai, Hidehiro authored
This patch adds an interface to set/reset flags which determines each memory segment should be dumped or not when a core file is generated. /proc/<pid>/coredump_filter file is provided to access the flags. You can change the flag status for a particular process by writing to or reading from the file. The flag status is inherited to the child process when it is created. Signed-off-by:
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Kawai, Hidehiro authored
This patch changes mm_struct.dumpable to a pair of bit flags. set_dumpable() converts three-value dumpable to two flags and stores it into lower two bits of mm_struct.flags instead of mm_struct.dumpable. get_dumpable() behaves in the opposite way. [akpm@linux-foundation.org: export set_dumpable] Signed-off-by:
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Kawai, Hidehiro authored
This patch series is version 5 of the core dump masking feature, which controls which VMAs should be dumped based on their memory types and per-process flags. I adopted most of Andrew's suggestion at the previous version. He also suggested using system call instead of /proc/<pid>/ interface, I decided to use the latter continuously because adding new system call with pid argument will give a big impact on the kernel. You can access the per-process flags via /proc/<pid>/coredump_filter interface. coredump_filter represents a bitmask of memory types, and if a bit is set, VMAs of corresponding memory type are written into a core file when the process is dumped. The bitmask is inherited from the parent process when a process is created. The original purpose is to avoid longtime system slowdown when a number of processes which share a huge shared memory are dumped at the same time. To achieve this purpose, this patch series adds an ability to suppress dumping anonymous shared memory for specified processes. In this version, three other memory types are also supported. Here are the coredump_filter bits: bit 0: anonymous private memory bit 1: anonymous shared memory bit 2: file-backed private memory bit 3: file-backed shared memory The default value of coredump_filter is 0x3. This means the new core dump routine has the same behavior as conventional behavior by default. In this version, coredump_filter bits and mm.dumpable are merged into mm.flags, and it is accessed by atomic bitops. The supported core file formats are ELF and ELF-FDPIC. ELF has been tested, but ELF-FDPIC has not been built and tested because I don't have the test environment. This patch limits a value of suid_dumpable sysctl to the range of 0 to 2. Signed-off-by:
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Randy Dunlap authored
Remove include/linux/rmap.h from kernel-api.tmpl since it no longer contains kernel-doc. Fixes this warning: Warning(linux-2.6.22//include/linux/rmap.h): no structured comments found Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Randy Dunlap authored
If a parameter description begins with a '.', this indicates a "request" for "man" mode output (*roff), so it needs special handling. Problem case is in include/asm-i386/atomic.h for function atomic_add_unless(): * @u: ...unless v is equal to u. This parameter description is currently not printed in man mode output. [akpm@linux-foundation.org: cleanup] Signed-off-by:
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