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CVS log for src/sys/kern/kern_ktrace.c

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Revision 1.29.4.1: download - view: text, markup, annotated - select for diffs
Wed Apr 16 17:58:28 2008 UTC (6 years, 4 months ago) by dillon
Branches: DragonFly_RELEASE_1_12
CVS tags: DragonFly_RELEASE_1_12_Slip
Diff to: previous 1.29: preferred, unified; next MAIN 1.30: preferred, unified
Changes since revision 1.29: +26 -26 lines
MFC - Fix ktrace for threaded processes.

Revision 1.30: download - view: text, markup, annotated - select for diffs
Mon Apr 14 12:01:50 2008 UTC (6 years, 4 months ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_RELEASE_2_0_Slip, DragonFly_RELEASE_2_0, DragonFly_Preview
Diff to: previous 1.29: preferred, unified
Changes since revision 1.29: +26 -26 lines
Fix ktrace for threaded processes.  Move the KTRFAC_ACTIVE flag to the LWP
so a ktrace occuring on one LWP does not cause another LWP to fail to log
a trace entry.

Revision 1.29: download - view: text, markup, annotated - select for diffs
Mon May 7 15:43:30 2007 UTC (7 years, 3 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_10_Slip, DragonFly_RELEASE_1_10
Branch point for: DragonFly_RELEASE_1_12
Diff to: previous 1.28: preferred, unified
Changes since revision 1.28: +4 -0 lines
Add fields to the ktrace header to allow kdump to also display the TID
for individual threads.  Add a new option to ktrace, -j, which forces
TID display even if kdump doesn't think the program is threaded.

Submitted-by: Joe Talbott <josepht@cstone.net>
With-additions-by: Matt Dillon

Revision 1.28: download - view: text, markup, annotated - select for diffs
Sat Aug 12 00:26:20 2006 UTC (8 years ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_8_Slip, DragonFly_RELEASE_1_8
Diff to: previous 1.27: preferred, unified
Changes since revision 1.27: +2 -2 lines
VNode sequencing and locking - part 3/4.

VNode aliasing is handled by the namecache (aka nullfs), so there is no
longer a need to have VOP_LOCK, VOP_UNLOCK, or VOP_ISSLOCKED as 'VOP'
functions.  Both NFS and DEADFS have been using standard locking functions
for some time and are no longer special cases.  Replace all uses with
native calls to vn_lock, vn_unlock, and vn_islocked.

We can't have these as VOP functions anyhow because of the introduction of
the new SYSLINK transport layer, since vnode locks are primarily used to
protect the local vnode structure itself.

Revision 1.27: download - view: text, markup, annotated - select for diffs
Mon Jun 5 07:26:10 2006 UTC (8 years, 3 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_6_Slip, DragonFly_RELEASE_1_6
Diff to: previous 1.26: preferred, unified
Changes since revision 1.26: +2 -2 lines
Modify kern/makesyscall.sh to prefix all kernel system call procedures
with "sys_".  Modify all related kernel procedures to use the new naming
convention.  This gets rid of most of the namespace overloading between
the kernel and standard header files.

Revision 1.26: download - view: text, markup, annotated - select for diffs
Thu May 25 04:17:09 2006 UTC (8 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.25: preferred, unified
Changes since revision 1.25: +57 -21 lines
Adjust pamp_growkernel(), elf_brand_inuse(), and ktrace() to use
allproc_scan() instead of scanning the process list manually.

Revision 1.25: download - view: text, markup, annotated - select for diffs
Wed May 17 20:35:33 2006 UTC (8 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.24: preferred, unified
Changes since revision 1.24: +19 -18 lines
Oops, last commit was slightly premature.  Fix a bug-a-boo and remove
debugging code.

Revision 1.24: download - view: text, markup, annotated - select for diffs
Wed May 17 20:20:49 2006 UTC (8 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.23: preferred, unified
Changes since revision 1.23: +82 -63 lines
The ktracing code was not properly matching up VOP_OPEN and VOP_CLOSE calls.

Replace the p_tracep tracing vnode in struct proc with a pointer to
a ref-counted ktrace_node.  Ref the node instead of the vnode to prevent
the destruction of the vnode.

Revision 1.23: download - view: text, markup, annotated - select for diffs
Wed May 17 18:30:20 2006 UTC (8 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.22: preferred, unified
Changes since revision 1.22: +22 -56 lines
Pass the process (p) instead of the vnode (p->p_tracep) to the kernel tracing
API functions.  This allows the vnode ref to be consolidated into one place.

Revision 1.22: download - view: text, markup, annotated - select for diffs
Sat May 6 02:43:12 2006 UTC (8 years, 4 months ago) by dillon
Branches: MAIN
Diff to: previous 1.21: preferred, unified
Changes since revision 1.21: +2 -2 lines
The thread/proc pointer argument in the VFS subsystem originally existed
for...  well, I'm not sure *WHY* it originally existed when most of the
time the pointer couldn't be anything other then curthread or curproc or
the code wouldn't work.  This is particularly true of lockmgr locks.

Remove the pointer argument from all VOP_*() functions, all fileops functions,
and most ioctl functions.

Revision 1.21: download - view: text, markup, annotated - select for diffs
Fri May 5 21:15:08 2006 UTC (8 years, 4 months ago) by dillon
Branches: MAIN
Diff to: previous 1.20: preferred, unified
Changes since revision 1.20: +3 -3 lines
Simplify vn_lock(), VOP_LOCK(), and VOP_UNLOCK() by removing the thread_t
argument.  These calls now always use the current thread as the lockholder.
Passing a thread_t to these functions has always been questionable at best.

Revision 1.20: download - view: text, markup, annotated - select for diffs
Mon Mar 27 16:18:34 2006 UTC (8 years, 5 months ago) by dillon
Branches: MAIN
Diff to: previous 1.19: preferred, unified
Changes since revision 1.19: +0 -2 lines
Remove NQNFS support.  The mechanisms are too crude to co-exist with
upcoming cache coherency management work and the original implementation
hacked up the NFS code pretty severely.

Move nqnfs_clientd() out of nfs_nqlease.c to a new file, nfs_kerb.c,
and rename it nfs_clientd().

Revision 1.18.2.1: download - view: text, markup, annotated - select for diffs
Thu Jul 28 23:46:57 2005 UTC (9 years, 1 month ago) by dillon
Branches: DragonFly_RELEASE_1_2
CVS tags: DragonFly_RELEASE_1_2_Slip
Diff to: previous 1.18: preferred, unified; next MAIN 1.19: preferred, unified
Changes since revision 1.18: +8 -0 lines
MFC 1.19.  Fix a panic that occurs if the filesystem containing an active
ktrace file runs out of space while ktrace'ing multiple processes.

Revision 1.19: download - view: text, markup, annotated - select for diffs
Thu Jul 28 18:10:23 2005 UTC (9 years, 1 month ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_4_Slip, DragonFly_RELEASE_1_4
Diff to: previous 1.18: preferred, unified
Changes since revision 1.18: +8 -0 lines
If multiple processes are being traced and some other process has a write
error, the vnode ref that we rely on from p_tracep can get ripped out from
under us, causing a panic.  vref() a the ktrace vnode for the duration of
the write rather then relying on the ref from p_tracep.

Revision 1.18: download - view: text, markup, annotated - select for diffs
Tue Mar 29 00:35:55 2005 UTC (9 years, 5 months ago) by drhodus
Branches: MAIN
CVS tags: DragonFly_Stable
Branch point for: DragonFly_RELEASE_1_2
Diff to: previous 1.17: preferred, unified
Changes since revision 1.17: +1 -1 lines
Remove some uses of the SCARG macro.

Revision 1.17: download - view: text, markup, annotated - select for diffs
Fri Nov 12 00:09:23 2004 UTC (9 years, 9 months ago) by dillon
Branches: MAIN
Diff to: previous 1.16: preferred, unified
Changes since revision 1.16: +16 -15 lines
VFS messaging/interfacing work stage 9/99: VFS 'NEW' API WORK.

NOTE: unionfs and nullfs are temporarily broken by this commit.

* Remove the old namecache API.  Remove vfs_cache_lookup(), cache_lookup(),
  cache_enter(), namei() and lookup() are all gone.  VOP_LOOKUP() and
  VOP_CACHEDLOOKUP() have been collapsed into a single non-caching
  VOP_LOOKUP().

* Complete the new VFS CACHE (namecache) API.  The new API is able to
  supply topological guarentees and is able to reserve namespaces,
  including negative cache spaces (whether the target name exists or not),
  which the new API uses to reserve namespace for things like NRENAME
  and NCREATE (and others).

* Complete the new namecache API.  VOP_NRESOLVE, NLOOKUPDOTDOT, NCREATE,
  NMKDIR, NMKNOD, NLINK, NSYMLINK, NWHITEOUT, NRENAME, NRMDIR, NREMOVE.
  These new calls take (typicaly locked) namecache pointers rather then
  combinations of directory vnodes, file vnodes, and name components.  The
  new calls are *MUCH* simpler in concept and implementation.  For example,
  VOP_RENAME() has 8 arguments while VOP_NRENAME() has only 3 arguments.

  The new namecache API uses the namecache to lock namespaces without having
  to lock the underlying vnodes.  For example, this allows the kernel
  to reserve the target name of a create function trivially.  Namecache
  records are maintained BY THE KERNEL for both positive and negative hits.

  Generally speaking, the kernel layer is now responsible for resolving
  path elements.  NRESOLVE is called when an unresolved namecache record
  needs to be resolved.  Unlike the old VOP_LOOKUP, NRESOLVE is simply
  responsible for associating a vnode to a namecache record (positive hit)
  or telling the system that it's a negative hit, and not responsible for
  handling symlinks or other special cases or doing any of the other
  path lookup work, much unlike the old VOP_LOOKUP.

  It should be particularly noted that the new namecache topology does not
  allow disconnected namecache records.  In rare cases where a vnode must
  be converted to a namecache pointer for new API operation via a file handle
  (i.e. NFS), the cache_fromdvp() function is provided and a new API VOP,
  VOP_NLOOKUPDOTDOT() is provided to allow the namecache to resolve the
  topology leading up to the requested vnode.  These and other topological
  guarentees greatly reduce the complexity of the new namecache API.

  The new namei() is called nlookup().  This function uses a combination
  of cache_n*() calls, VOP_NRESOLVE(), and standard VOP calls resolve the
  supplied path, deal with symlinks, and so forth, in a nice small compact
  compartmentalized procedure.

* The old VFS code is no longer responsible for maintaining namecache records,
  a function which was mostly adhoc cache_purge()s occuring before the VFS
  actually knows whether an operation will succeed or not.

  The new VFS code is typically responsible for adjusting the state of
  locked namecache records passed into it.  For example, if NCREATE succeeds
  it must call cache_setvp() to associate the passed namecache record with
  the vnode representing the successfully created file.  The new requirements
  are much less complex then the old requirements.

* Most VFSs still implement the old API calls, albeit somewhat modified
  and in particular the VOP_LOOKUP function is now *MUCH* simpler.  However,
  the kernel now uses the new API calls almost exclusively and relies on
  compatibility code installed in the default ops (vop_compat_*()) to
  convert the new calls to the old calls.

* All kernel system calls and related support functions which used to do
  complex and confusing namei() operations now do far less complex and
  far less confusing nlookup() operations.

* SPECOPS shortcutting has been implemented.  User reads and writes now go
  directly to supporting functions which talk to the device via fileops
  rather then having to be routed through VOP_READ or VOP_WRITE, saving
  significant overhead.  Note, however, that these only really effect
  /dev/null and /dev/zero.

  Implementing this was fairly easy, we now simply pass an optional
  struct file pointer to VOP_OPEN() and let spec_open() handle the
  override.

SPECIAL NOTES: It should be noted that we must still lock a directory vnode
LK_EXCLUSIVE before issuing a VOP_LOOKUP(), even for simple lookups, because
a number of VFS's (including UFS) store active directory scanning information
in the directory vnode.  The legacy NAMEI_LOOKUP cases can be changed to
use LK_SHARED once these VFS cases are fixed.  In particular, we are now
organized well enough to actually be able to do record locking within a
directory for handling NCREATE, NDELETE, and NRENAME situations, but it hasn't
been done yet.

Many thanks to all of the testers and in particular David Rhodus for
finding a large number of panics and other issues.

Revision 1.16: download - view: text, markup, annotated - select for diffs
Tue Oct 12 19:20:46 2004 UTC (9 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.15: preferred, unified
Changes since revision 1.15: +3 -3 lines
VFS messaging/interfacing work stage 8/99: Major reworking of the vnode
interlock and other miscellanious things.  This patch also fixes FS
corruption due to prior vfs work in head.  In particular, prior to this
patch the namecache locking could introduce blocking conditions that
confuse the old vnode deactivation and reclamation code paths.  With
this patch there appear to be no serious problems even after two days
of continuous testing.

* VX lock all VOP_CLOSE operations.
* Fix two NFS issues.  There was an incorrect assertion (found by
  David Rhodus), and the nfs_rename() code was not properly
  purging the target file from the cache, resulting in Stale file
  handle errors during, e.g. a buildworld with an NFS-mounted /usr/obj.
* Fix a TTY session issue.  Programs which open("/dev/tty" ,...) and
  then run the TIOCNOTTY ioctl were causing the system to lose track
  of the open count, preventing the tty from properly detaching.
  This is actually a very old BSD bug, but it came out of the woodwork
  in DragonFly because I am now attempting to track device opens
  explicitly.
* Gets rid of the vnode interlock.  The lockmgr interlock remains.
* Introduced VX locks, which are mandatory vp->v_lock based locks.
* Rewrites the locking semantics for deactivation and reclamation.
  (A ref'd VX lock'd vnode is now required for vgone(), VOP_INACTIVE,
  and VOP_RECLAIM).  New guarentees emplaced with regard to vnode
  ripouts.
* Recodes the mountlist scanning routines to close timing races.
* Recodes getnewvnode to close timing races (it now returns a
  VX locked and refd vnode rather then a refd but unlocked vnode).
* Recodes VOP_REVOKE- a locked vnode is now mandatory.
* Recodes all VFS inode hash routines to close timing holes.
* Removes cache_leaf_test() - vnodes representing intermediate
  directories are now held so the leaf test should no longer be
  necessary.
* Splits the over-large vfs_subr.c into three additional source
  files, broken down by major function (locking, mount related,
  filesystem syncer).

* Changes splvm() protection to a critical-section in a number of
  places (bleedover from another patch set which is also about to be
  committed).

Known issues not yet resolved:

* Possible vnode/namecache deadlocks.
* While most filesystems now use vp->v_lock, I haven't done a final
  pass to make vp->v_lock mandatory and to clean up the few remaining
  inode based locks (nwfs I think and other obscure filesystems).
* NullFS gets confused when you hit a mount point in the underlying
  filesystem.
* Only UFS and NFS have been well tested
* NFS is not properly timing out namecache entries, causing changes made
  on the server to not be properly detected on the client if the client
  already has a negative-cache hit for the filename in question.

Testing-by: David Rhodus <sdrhodus@gmail.com>,
	    Peter Kadau <peter.kadau@tuebingen.mpg.de>,
	    walt <wa1ter@myrealbox.com>,
	    others

Revision 1.15: download - view: text, markup, annotated - select for diffs
Fri May 21 15:41:23 2004 UTC (10 years, 3 months ago) by drhodus
Branches: MAIN
CVS tags: DragonFly_Snap29Sep2004, DragonFly_Snap13Sep2004, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
Diff to: previous 1.14: preferred, unified
Changes since revision 1.14: +2 -2 lines
Cleanup pass. Removed code that is not needed anymore.
Cleanup VOP_LEASE() uses and document.

Add in a debug function for buffer pool statistical information which can
be toggled via debug.syncprt.

Revision 1.14: download - view: text, markup, annotated - select for diffs
Sat Apr 24 04:32:03 2004 UTC (10 years, 4 months ago) by drhodus
Branches: MAIN
Diff to: previous 1.13: preferred, unified
Changes since revision 1.13: +6 -6 lines
Remove the VREF() macro and uses of it.
Remove uses of 0x20 before ^I inside vnode.h

Revision 1.13: download - view: text, markup, annotated - select for diffs
Mon Mar 1 06:33:17 2004 UTC (10 years, 6 months ago) by dillon
Branches: MAIN
Diff to: previous 1.12: preferred, unified
Changes since revision 1.12: +3 -3 lines
Newtoken commit.  Change the token implementation as follows:  (1) Obtaining
a token no longer enters a critical section.  (2) tokens can be held through
schedular switches and blocking conditions and are effectively released and
reacquired on resume.  Thus tokens serialize access only while the thread
is actually running.  Serialization is not broken by preemptive interrupts.
That is, interrupt threads which preempt do no release the preempted thread's
tokens.  (3) Unlike spl's, tokens will interlock w/ interrupt threads on
the same or on a different cpu.

The vnode interlock code has been rewritten and the API has changed.  The
mountlist vnode scanning code has been consolidated and all known races have
been fixed.  The vnode interlock is now a pool token.

The code that frees unreferenced vnodes whos last VM page has been freed has
been moved out of the low level vm_page_free() code and moved to the
periodic filesystem sycer code in vfs_msycn().

The SMP startup code and the IPI code has been cleaned up considerably.
Certain early token interactions on AP cpus have been moved to the BSP.

The LWKT rwlock API has been cleaned up and turned on.

Major testing by: David Rhodus

Revision 1.12: download - view: text, markup, annotated - select for diffs
Sat Feb 14 12:14:30 2004 UTC (10 years, 6 months ago) by eirikn
Branches: MAIN
Diff to: previous 1.11: preferred, unified
Changes since revision 1.11: +10 -36 lines
Replace K&R style functions with ANSI C style functions.

Revision 1.11: download - view: text, markup, annotated - select for diffs
Mon Sep 29 18:52:06 2003 UTC (10 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.10: preferred, unified
Changes since revision 1.10: +1 -2 lines
Cleanup: get rid of the CNP_NOFOLLOW pseudo-flag.  #define 0'd flags are a
really bad idea.

Revision 1.10: download - view: text, markup, annotated - select for diffs
Tue Sep 23 05:03:51 2003 UTC (10 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.9: preferred, unified
Changes since revision 1.9: +2 -1 lines
namecache work stage 1: namespace cleanups.  Add a NAMEI_ prefix to
CREATE, LOOKUP, DELETE, and RENAME.  Add a CNP_ prefix too all the name
lookup flags (nd_flags) e.g. ISDOTDOT->CNP_ISDOTDOT.

Revision 1.9: download - view: text, markup, annotated - select for diffs
Tue Aug 26 21:09:02 2003 UTC (11 years ago) by rob
Branches: MAIN
Diff to: previous 1.8: preferred, unified
Changes since revision 1.8: +5 -5 lines
__P() removal

Revision 1.8: download - view: text, markup, annotated - select for diffs
Sun Aug 3 10:07:41 2003 UTC (11 years, 1 month ago) by hmp
Branches: MAIN
Diff to: previous 1.7: preferred, unified
Changes since revision 1.7: +2 -2 lines
Use FOREACH_PROC_IN_SYSTEM() throughout.

Revision 1.7: download - view: text, markup, annotated - select for diffs
Sat Jul 26 19:42:11 2003 UTC (11 years, 1 month ago) by rob
Branches: MAIN
Diff to: previous 1.6: preferred, unified
Changes since revision 1.6: +5 -5 lines
Register keyword removal

Approved by: Matt Dillon

Revision 1.6: download - view: text, markup, annotated - select for diffs
Thu Jul 24 01:41:25 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.5: preferred, unified
Changes since revision 1.5: +1 -9 lines
Preliminary syscall messaging work.  Adjust all <syscall>_args structures
to include an lwkt_msg at their base which will eventually allow syscalls
to run asynch.  Note that this is for the kernel copy of the arguments, the
userland argument format has not changed for the standard syscall entry
point.

Begin abstracting a messaging syscall interface (#if 0'd out at the moment).

Change the syscall2 entry point to take the new expanded argument structure
into account.  Change sysent argument calculation (AS macro) to take the
new expanded argument structure into account.

Note: existing linux, svr4, and ibcs2 emulation may break with this commit,
though it is not intentional.

Revision 1.5: download - view: text, markup, annotated - select for diffs
Thu Jun 26 05:55:14 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: PRE_MP
Diff to: previous 1.4: preferred, unified
Changes since revision 1.4: +4 -5 lines
proc->thread stage 5:  BUF/VFS clearance!  Remove the ucred argument from
vop_close, vop_getattr, vop_fsync, and vop_createvobject.  These VOPs can
be called from multiple contexts so the cred is fairly useless, and UFS
ignorse it anyway.  For filesystems (like NFS) that sometimes need a cred
we use proc0.p_ucred for now.

This removal also removed the need for a 'proc' reference in the related
VFS procedures, which greatly helps our proc->thread conversion.

bp->b_wcred and bp->b_rcred have also been removed, and for the same reason.
It makes no sense to have a particular cred when multiple users can
access a file.  This may create issues with certain types of NFS mounts
but if it does we will solve them in a way that doesn't pollute the
struct buf.

Revision 1.4: download - view: text, markup, annotated - select for diffs
Wed Jun 25 03:55:57 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.3: preferred, unified
Changes since revision 1.3: +19 -19 lines
proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
pointers instead of process pointers as arguments, similar to what FreeBSD-5
did.  Note however that ultimately both APIs are going to be message-passing
which means the current thread context will not be useable for creds and
descriptor access.

Revision 1.3: download - view: text, markup, annotated - select for diffs
Mon Jun 23 17:55:41 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.2: preferred, unified
Changes since revision 1.2: +15 -19 lines
proc->thread stage 2: MAJOR revamping of system calls, ucred, jail API,
and some work on the low level device interface (proc arg -> thread arg).
As -current did, I have removed p_cred and incorporated its functions
into p_ucred.  p_prison has also been moved into p_ucred and adjusted
accordingly.  The jail interface tests now uses ucreds rather then processes.

The syscall(p,uap) interface has been changed to just (uap).  This is inclusive
of the emulation code.  It makes little sense to pass a proc pointer around
which confuses the MP readability of the code, because most system call code
will only work with the current process anyway.  Note that eventually
*ALL* syscall emulation code will be moved to a kernel-protected userland
layer because it really makes no sense whatsoever to implement these
emulations in the kernel.

suser() now takes no arguments and only operates with the current process.
The process argument has been removed from suser_xxx() so it now just takes
a ucred and flags.

The sysctl interface was adjusted somewhat.

Revision 1.2: download - view: text, markup, annotated - select for diffs
Tue Jun 17 04:28:41 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.1: preferred, unified
Changes since revision 1.1: +1 -0 lines
Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids.  Most
ids have been removed from !lint sections and moved into comment sections.

Revision 1.1: download - view: text, markup, annotated - select for diffs
Tue Jun 17 02:55:00 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: FREEBSD_4_FORK
import from FreeBSD RELENG_4 1.35.2.6

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