- 07 Nov, 2005 40 commits
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Ananth N Mavinakayanahalli authored
Changes to the base kprobes infrastructure to use RCU for synchronization during kprobe registration and unregistration. These changes coupled with the arch kprobe changes (next in series): a. serialize registration and unregistration of kprobes. b. enable lockless execution of handlers. Handlers can now run in parallel. Signed-off-by:
Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by:
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Ananth N Mavinakayanahalli authored
x86_64 changes to track kprobe execution on a per-cpu basis. We now track the kprobe state machine independently on each cpu using a arch specific kprobe control block. Signed-off-by:
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Ananth N Mavinakayanahalli authored
Sparc64 changes to track kprobe execution on a per-cpu basis. We now track the kprobe state machine independently on each cpu using an arch specific kprobe control block. Signed-off-by:
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Ananth N Mavinakayanahalli authored
PPC64 changes to track kprobe execution on a per-cpu basis. We now track the kprobe state machine independently on each cpu using an arch specific kprobe control block. Signed-off-by:
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Ananth N Mavinakayanahalli authored
IA64 changes to track kprobe execution on a per-cpu basis. We now track the kprobe state machine independently on each cpu using an arch specific kprobe control block. Signed-off-by:
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Ananth N Mavinakayanahalli authored
I386 changes to track kprobe execution on a per-cpu basis. We now track the kprobe state machine independently on each cpu, using an arch specific kprobe control block. Signed-off-by:
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Ananth N Mavinakayanahalli authored
Changes to the base kprobe infrastructure to track kprobe execution on a per-cpu basis. Signed-off-by:
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Ananth N Mavinakayanahalli authored
The following set of patches are aimed at improving kprobes scalability. We currently serialize kprobe registration, unregistration and handler execution using a single spinlock - kprobe_lock. With these changes, kprobe handlers can run without any locks held. It also allows for simultaneous kprobe handler executions on different processors as we now track kprobe execution on a per processor basis. It is now necessary that the handlers be re-entrant since handlers can run concurrently on multiple processors. All changes have been tested on i386, ia64, ppc64 and x86_64, while sparc64 has been compile tested only. The patches can be viewed as 3 logical chunks: patch 1: Reorder preempt_(dis/en)able calls patches 2-7: Introduce per_cpu data areas to track kprobe execution patches 8-9: Use RCU to synchronize kprobe (un)registration and handler execution. Thanks to Maneesh Soni, James Keniston and Anil Keshavamurthy for their review and suggestions. Thanks again to Anil, Hien Nguyen and Kevin Stafford for testing the patches. This patch: Reorder preempt_disable/enable() calls in arch kprobes files in preparation to introduce locking changes. No functional changes introduced by this patch. Signed-off-by:
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Corey Minyard authored
If a panic came from the IPMI watchdog pretimeout and that was reported via an NMI, it would also be reported via the standard IPMI flags, which would get picked up when reporting panic events and cause another panic. This adds an atomic to avoid calling panic twice. Signed-off-by:
Corey Minyard <cminyard@mvista.com> Signed-off-by:
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Corey Minyard authored
Use rcu_read_lock for the cmd_rcvrs list, since that was what what intended, anyway. This means that all the users of the cmd_rcvrs_lock are tasks, so the irq disables are no longer required for that lock and it can become a semaphore. Signed-off-by:
Corey Minyard <minyard@acm.org> Acked-by:
"Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by:
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Matt Domsch authored
Convert ipmi driver thread to kthread API, only sleep when interface is idle. Signed-off-by:
Matt Domsch <Matt_Domsch@dell.com> Cc: Corey Minyard <minyard@acm.org> Signed-off-by:
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Corey Minyard authored
We must poll for responses to commands when interrupts aren't in use. The default poll interval is based on using a kernel timer, which varies with HZ. For character-based interfaces like KCS and SMIC though, that can be way too slow (>15 minutes to flash a new firmware with KCS, >20 seconds to retrieve the sensor list). This creates a low-priority kernel thread to poll more often. If the state machine is idle, so is the kernel thread. But if there's an active command, it polls quite rapidly. This decrease a firmware flash time from 15 minutes to 1.5 minutes, and the sensor list time to 4.5 seconds, on a Dell PowerEdge x8x system. The timer-based polling remains, to ensure some amount of responsiveness even under high user process CPU load. Checking for a stopped timer at rmmod now uses atomics and del_timer_sync() to ensure safe stoppage. Signed-off-by:
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Corey Minyard authored
BMCs can get into ERROR0 state while flashing new firmware, particularly while the BMC is erasing the next flash block, which may take a just under 2 seconds on a Dell PowerEdge 2800 (1.75 seconds typical), during which time the single-threaded firmware may not be able to process new commands. In particular, clearing OBF may not take effect immediately. We want it to delay in ERROR0 after clearing OBF a bit waiting for OBF to actually be clear before proceeding. This introduces a new return value from the LLDD's event loop, SI_SM_CALL_WITH_TICK_DELAY. This means the calling thread/timer should schedule_timeout() at least 1 tick, rather than busy-wait. This is a longer delay than SI_SM_CALL_WITH_DELAY, which is typically a 250us busy-wait. Signed-off-by:
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Corey Minyard authored
The current BT retry/reset mechanism fails to succeed on a PowerEdge 1650, when the controller is wedged with B2H_ATN asserted at XACTION_START. If this occurs, no further commands will ever succeed unless the state of the controller is first cleared out. Furthermore, the soft reset would only occur if the first command after insmod was the one that timed out, not if a later command timed out. This patch changes the retry/reset mechanism to be as follows: Before retrying a command, clear the state of the BT controller such that the flags represent ready for a new transaction. This increases the chance of success of the restarted transaction. After 2 retries, issue a soft reset and retry one more time before giving up and reporting back a failure. Signed-off-by:
Rocky Craig <rocky.craig@hp.com> Signed-off-by:
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Corey Minyard authored
Some commands, on some system BMCs, don't respond at at all. This is seen on Dell PowerEdge x6xx and x7xx systems with IPMI 1.0 BT controllers when a "Get SDR" command is issued, with a length field of 0x3A, which happens to be the length of about SDR entries. If another length is passed, this command succeeds. This patch adds general infrastructure for receiving commands before they're passed down to the low-level drivers, such that they can be completed immediately, or modified, prior to being sent to ->start_transaction(). Signed-off-by:
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Corey Minyard authored
Make SMIC driver ignore EVT_AVAIL and SMS_ATN bits in flags register, as they're used by systems management interrupts, not the host OS. Make the OEM0 Data Available handler work for pre-IPMI 1.5 systems from Dell too. Without these two fixes, PowerEdge 2650 and other similar systems with SMIC may hang a process (modprobe or anything using /dev/ipmi0). Signed-off-by:
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Corey Minyard authored
Make module_param and MODULE_PARAM_DESC agree on poweroff_powercycle name. There was an extraneous ifdef in the IPMI poweroff code that prevented it from working if PROC_FS was disabled. Signed-off-by:
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Corey Minyard authored
Modify the IPMI watchdog parameters (the ones that make sense) to be exported from sysfs. This is somewhat complicated because these parameters have side-effects that must be handled. Signed-off-by:
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Corey Minyard authored
A number of small changes for the various system interface drivers, consolidated from a number of patches from Matt Domsch. Clear B2H_ATN and drain the BMC message buffer on command timeout. This prevents further commands from failing after a timeout. Add bt_debug and smic_debug module parameters, expose them in sysfs. This lets you enable and disable debugging messages at runtime. Unsigned jiffies math in ipmi_si_intf.c causes a too-large value to be passed to ->event() after jiffies wrap-around. The BT driver had caught this, but didn't know how to fix it. Now all calls to ->event() use a sane value for time. Increase timeout for commands handed to the BT driver from 2 seconds to 5 seconds. This is necessary particularly when the previous command was a "Clear SEL", as that command completes, yet the BMC isn't really ready to handle another command yet. Silence BT debugging messages which were being printed on the console. Increase SMIC timeout form 1/10s to 2s. This is needed on Dell PowerEdge 2650 and PowerEdge 750 with ERA/O cards to allow commands to complete without timing out. Adds kcs_debug module param, to match behavior of BT and SMIC. This also prevents messages from being sent to the console unless explicitly requested. Signed-off-by:
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Corey Minyard authored
This patch is rather large, but it really can't be done in smaller chunks easily and I believe it is an important change. This has been out and tested for a while in the latest IPMI driver release. There are no functional changes, just changes as necessary to convert the locking over (and a few minor style updates). The IPMI driver uses read/write locks to ensure that things exist while they are in use. This is bad from a number of points of view. This patch removes the rwlocks and uses refcounts and RCU lists to manage what the locks did. Signed-off-by:
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Nick Piggin authored
Introduce the notion of cooperating processes (those that submit requests close to one another), and use these statistics to make better choices about whether or not to do anticipatory waiting. Help and analysis from Seetharami Seelam <seelam@cs.utep.edu> Performance testing from Seelam: I set up my system and executed a couple of tests that I used for OLS. I tested with AS, cooperative process patch merged in -mm tree (which I called Nick, below) and the cooperative patch with modifications to as_update_iohist (which I called Seelam). I used a dual-processor (2.28GHz Pentium 4 Xeon) system, with 1 GB main memory and 1 MB L2 cache, running Linux 2.6.9. Only a single processor is used for the experiments. I used 7.2K RPM Maxtor 10GB drive configured with ext2 file system. Experiment 1 (ex1) consists of reading one Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 2 (ex2) consists of reading two disjoint Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 3 (ex3) consists of streaming read of a 2GB file in the background and 1 instance of the chunk reads in Experiment 1. Timings for reading the Linux source are shown below: AS Nick Seelam ex1: 0m25.813s 0m27.859s 0m27.640s ex2: 1m11.468s 1m13.918s 1m5.869s ex3: 81m44.352s 10m38.572s 6m47.994s The difference between the numbers in Experiment 3 must be due to the code in as_update_iohist. (akpm: that's not part of this patch. So this patch is "Nick"). Signed-off-by:Nick Piggin <npiggin@suse.de> Signed-off-by:
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Miklos Szeredi authored
This patch passes the file handle supplied in iattr to userspace, in case the ->setattr() was invoked from sys_ftruncate(). This solves the permission checking (or lack thereof) in ftruncate() for the class of filesystems served by an unprivileged userspace process. Signed-off-by:
Miklos Szeredi <miklos@szeredi.hu> Signed-off-by:
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Miklos Szeredi authored
This patch adds an atomic create+open operation. This does not yet work if the file type changes between lookup and create+open, but solves the permission checking problems for the separte create and open methods. Signed-off-by:
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Miklos Szeredi authored
Add a new access call, which will only be called if ->permission is invoked from sys_access(). In all other cases permission checking is delayed until the actual filesystem operation. Signed-off-by:
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Miklos Szeredi authored
Though the following changes are all backward compatible (from the kernel's as well as the library's POV) change the minor version, so interested applications can detect new features. Signed-off-by:
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Miklos Szeredi authored
This patch extends the iattr structure with a file pointer memeber, and adds an ATTR_FILE validity flag for this member. This is set if do_truncate() is invoked from ftruncate() or from do_coredump(). The change is source and binary compatible. Signed-off-by:
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Christoph Hellwig authored
The sys_ptrace boilerplate code (everything outside the big switch statement for the arch-specific requests) is shared by most architectures. This patch moves it to kernel/ptrace.c and leaves the arch-specific code as arch_ptrace. Some architectures have a too different ptrace so we have to exclude them. They continue to keep their implementations. For sh64 I had to add a sh64_ptrace wrapper because it does some initialization on the first call. For um I removed an ifdefed SUBARCH_PTRACE_SPECIAL block, but SUBARCH_PTRACE_SPECIAL isn't defined anywhere in the tree. Signed-off-by:
Christoph Hellwig <hch@lst.de> Acked-by:
Paul Mackerras <paulus@samba.org> Acked-by:
Ralf Baechle <ralf@linux-mips.org> Acked-By:
David Howells <dhowells@redhat.com> Acked-by:
Russell King <rmk+kernel@arm.linux.org.uk> Acked-by:
Paul Mundt <lethal@linux-sh.org> Signed-off-by:
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Christoph Hellwig authored
Both AFFS and HPFS update the ctime and mtime in the write path, after generic_file_write returned and marked the inode dirty. Signed-off-by:
Roman Zippel <zippel@linux-m68k.org> Signed-off-by:
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Christoph Hellwig authored
afs actually had a write method that returned different errors depending on whether some flag was set - better return the standard EINVAL errno. Signed-off-by:
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Christoph Hellwig authored
No need to duplicate a generic readonly file ops table in befs. Signed-off-by:
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Christoph Hellwig authored
No need to duplicate a generic readonly file ops table in befs. Signed-off-by:
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Tim Schmielau authored
Fix more include file problems that surfaced since I submitted the previous fix-missing-includes.patch. This should now allow not to include sched.h from module.h, which is done by a followup patch. Signed-off-by:
Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by:
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Peter Staubach authored
There is a memory leak possible in dentry_open(). If get_empty_filp() fails, then the references to dentry and mnt need to be released. The attached patch adds the calls to dput() and mntput() to release these two references. Signed-off-by:
Peter Staubach <staubach@redhat.com> Signed-off-by:
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Muli Ben-Yehuda authored
Updates to Documentation/vm/hugetlbpage.txt: - there's no need to select HUGETLB_PAGE manually and it's no longer under the processor menu. Update the text accordingly. - fix typos and trim trailing whitespace. Signed-Off-By:
Muli Ben-Yehuda <mulix@mulix.org> Signed-off-by:
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Coywolf Qi Hunt authored
Get rid of the `int unused' parameter of __find_get_block_slow(). Signed-off-by:
Coywolf Qi Hunt <qiyong@fc-cn.com> Signed-off-by:
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Davi Arnaut authored
Data allocated with "__getname()" should always be free'd with "__putname()" because of the AUDITSYSCALL code. Signed-off-by:
Davi Arnaut <davi.arnaut@gmail.com> Cc: Urban Widmark <urban@teststation.com> Signed-off-by:
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Davi Arnaut authored
Data allocated with "__getname()" should always be free'd with "__putname()" because of the AUDITSYSCALL code. Signed-off-by:
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Adrian Bunk authored
- "extern inline" -> "static inline" - every file should #include the headers containing the prototypes for it's global functions Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Marcelo Tosatti authored
Mikael Pettersson <mikpe@csd.uu.se> noted that the current 2.6-git (and 2.4) patch to disallow KDSKBSENT for unpriviledged users should be less restrictive allowing reading of current function key string entry, but not writing. Signed-off-by:
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David Gibson authored
The code for FUTEX_WAKE_OP calls an arch callback, futex_atomic_op_inuser(). That callback can return an error code, but currently the caller assumes any error is EFAULT, and will try various things to resolve the fault before eventually giving up with EFAULT (regardless of the original error code). This is not a theoretical case - arch callbacks currently return -ENOSYS if the opcode they are given is bogus. This patch alters the code to detect non-EFAULT errors and return them directly to the user. Of course, whether -ENOSYS is the correct return value for the bogus opcode case, or whether EINVAL would be more appropriate is another question. Signed-off-by:
David Gibson <dwg@au1.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jamie Lokier <jamie@shareable.org> Signed-off-by:
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