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* Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)Pawel Biernacki2020-02-261-1/+3
| | | | | | | | | | | | | | | | | | | r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718 Notes: svn path=/head/; revision=358333
* ANSIfy sys/kernEd Maste2018-06-011-2/+1
| | | | Notes: svn path=/head/; revision=334486
* Stop using fuswintr() and suswintr() in the profiler.Brooks Davis2018-04-171-20/+12
| | | | | | | | | | | | | | | Always take the AST path rather than calling MD functions which are often implemented as always failing. The is the case on amd64, arm, i386, and powerpc. This optimization (inherited from 4.4 Lite) is a pessimization on those architectures and is the sole use of these functions. They will be removed in a seperate commit. Reviewed by: kib Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D15101 Notes: svn path=/head/; revision=332650
* sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-201-0/+2
| | | | | | | | | | | | | | | | | Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Notes: svn path=/head/; revision=326023
* Renumber license clauses in sys/kern to avoid skipping #3Ed Maste2016-09-151-1/+1
| | | | Notes: svn path=/head/; revision=305832
* sys/kern: spelling fixes in comments.Pedro F. Giffuni2016-04-291-1/+1
| | | | | | | No functional change. Notes: svn path=/head/; revision=298819
* The process spin lock currently has the following distinct uses:Konstantin Belousov2014-11-261-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Threads lifetime cycle, in particular, counting of the threads in the process, and interlocking with process mutex and thread lock. The main reason of this is that turnstile locks are after thread locks, so you e.g. cannot unlock blockable mutex (think process mutex) while owning thread lock. - Virtual and profiling itimers, since the timers activation is done from the clock interrupt context. Replace the p_slock by p_itimmtx and PROC_ITIMLOCK(). - Profiling code (profil(2)), for similar reason. Replace the p_slock by p_profmtx and PROC_PROFLOCK(). - Resource usage accounting. Need for the spinlock there is subtle, my understanding is that spinlock blocks context switching for the current thread, which prevents td_runtime and similar fields from changing (updates are done at the mi_switch()). Replace the p_slock by p_statmtx and PROC_STATLOCK(). The split is done mostly for code clarity, and should not affect scalability. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=275121
* When sleeping waiting for the profiling stop, always set P_STOPPROFKonstantin Belousov2014-11-101-0/+1
| | | | | | | | | | | | | before dropping process lock. Clear P_STOPPROF when doing wakeup. Both issues caused thread to hang in stopprofclock() "stopprof" sleep. Reported and tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=274343
* Fully support constructors for the purpose of code coverage analysis.Marcel Moolenaar2014-10-201-47/+0
| | | | | | | | | | | | | | | | | | | | This involves: 1. Have the loader pass the start and size of the .ctors section to the kernel in 2 new metadata elements. 2. Have the linker backends look for and record the start and size of the .ctors section in dynamically loaded modules. 3. Have the linker backends call the constructors as part of the final work of initializing preloaded or dynamically loaded modules. Note that LLVM appends the priority of the constructors to the name of the .ctors section. Not so when compiling with GCC. The code currently works for GCC and not for LLVM. Submitted by: Dmitry Mikulin <dmitrym@juniper.net> Obtained from: Juniper Networks, Inc. Notes: svn path=/head/; revision=273334
* Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.Ed Schouten2011-11-071-1/+1
| | | | | | | | | The SYSCTL_NODE macro defines a list that stores all child-elements of that node. If there's no SYSCTL_DECL macro anywhere else, there's no reason why it shouldn't be static. Notes: svn path=/head/; revision=227309
* In order to maximize the re-usability of kernel code in user space thisKip Macy2011-09-161-3/+3
| | | | | | | | | | | | | | | | patch modifies makesyscalls.sh to prefix all of the non-compatibility calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel entry points and all places in the code that use them. It also fixes an additional name space collision between the kernel function psignal and the libc function of the same name by renaming the kernel psignal kern_psignal(). By introducing this change now we will ease future MFCs that change syscalls. Reviewed by: rwatson Approved by: re (bz) Notes: svn path=/head/; revision=225617
* Revert r210225 - turns out I was wrong; the "/*-" is not license-onlyEdward Tomasz Napierala2010-07-181-1/+1
| | | | | | | | | | thing; it's also used to indicate that the comment should not be automatically rewrapped. Explained by: cperciva@ Notes: svn path=/head/; revision=210226
* The "/*-" comment marker is supposed to denote copyrights. Remove non-copyrightEdward Tomasz Napierala2010-07-181-1/+1
| | | | | | | occurences from sys/sys/ and sys/kern/. Notes: svn path=/head/; revision=210225
* Use ANSI function definition for profil.Warner Losh2009-02-031-3/+1
| | | | Notes: svn path=/head/; revision=188060
* In keeping with style(9)'s recommendations on macros, use a ';'Robert Watson2008-03-161-2/+2
| | | | | | | | | | | | after each SYSINIT() macro invocation. This makes a number of lightweight C parsers much happier with the FreeBSD kernel source, including cflow's prcc and lxr. MFC after: 1 month Discussed with: imp, rink Notes: svn path=/head/; revision=177253
* Commit 14/14 of sched_lock decomposition.Jeff Roberson2007-06-051-7/+10
| | | | | | | | | | | | | | - Use thread_lock() rather than sched_lock for per-thread scheduling sychronization. - Use the per-process spinlock rather than the sched_lock for per-process scheduling synchronization. Tested by: kris, current@ Tested on: i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc. Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each) Notes: svn path=/head/; revision=170307
* - Move clock synchronization into a seperate clock lock so the globalJeff Roberson2007-05-201-5/+5
| | | | | | | | | | | scheduler lock is not involved. sched_lock still protects the sched_clock call. Another patch will remedy this. Contributed by: Attilio Rao <attilio@FreeBSD.org> Tested by: kris, jeff Notes: svn path=/head/; revision=169803
* Remove 'MPSAFE' annotations from the comments above most system calls: allRobert Watson2007-03-041-3/+0
| | | | | | | | | | | system calls now enter without Giant held, and then in some cases, acquire Giant explicitly. Remove a number of other MPSAFE annotations in the credential code and tweak one or two other adjacent comments. Notes: svn path=/head/; revision=167211
* Change the addupc_*() functions to use the uintfptr_t type for pc ratherJohn Baldwin2005-12-161-2/+2
| | | | | | | than uintptr_t as that is technically more correct. Notes: svn path=/head/; revision=153489
* netchild's mega-patch to isolate compiler dependencies into a centralJoerg Wunsch2005-03-021-2/+2
| | | | | | | | | | | | | | | | | | | place. This moves the dependency on GCC's and other compiler's features into the central sys/cdefs.h file, while the individual source files can then refer to #ifdef __COMPILER_FEATURE_FOO where they by now used to refer to #if __GNUC__ > 3.1415 && __BARC__ <= 42. By now, GCC and ICC (the Intel compiler) have been actively tested on IA32 platforms by netchild. Extension to other compilers is supposed to be possible, of course. Submitted by: netchild Reviewed by: various developers on arch@, some time ago Notes: svn path=/head/; revision=143063
* - Move TDF_OWEPREEMPT, TDF_OWEUPC, and TDF_USTATCLOCK over to td_pflagsJohn Baldwin2004-07-161-3/+4
| | | | | | | | | | | | since they are only accessed by curthread and thus do not need any locking. - Move pr_addr and pr_ticks out of struct uprof (which is per-process) and directly into struct thread as td_profil_addr and td_profil_ticks as these variables are really per-thread. (They are used to defer an addupc_intr() that was too "hard" until ast()). Notes: svn path=/head/; revision=132266
* Tidy up uprof locking. Mostly the fields are protected by both the procJohn Baldwin2004-07-021-10/+18
| | | | | | | | | | lock and sched_lock so they can be read with either lock held. Document the locking as well. The one remaining bogosity is that pr_addr and pr_ticks should be per-thread but profiling of multithreaded apps is currently undefined. Notes: svn path=/head/; revision=131437
* Enable MI bits for gcc -ftest-coverage -fprofile-arcs on amd64.Tim J. Robbins2004-05-291-1/+2
| | | | Notes: svn path=/head/; revision=129826
* Fixed printf format errors which helped break GUPROF for arches withBruce Evans2004-05-201-2/+2
| | | | | | | 64-bit function pointers. Notes: svn path=/head/; revision=129502
* Initialize the history counter type field in struct gmonparam asBruce Evans2004-05-201-0/+4
| | | | | | | | | | threatened in rev.1.10 of usr.sbin/kgmon/kgmon.c more than 2 years ago. kgmon has been recovering from the missing initialization for too long, but the fixup there is ifdefed for i386's and shouldn't be needed for other arches. Notes: svn path=/head/; revision=129501
* Moved i386 asms to an i386 header. The asms are for calibration ofBruce Evans2004-05-201-19/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | high resolution kernel profiling (options GUPROF. "U" in GUPROF stands for microseconds resolution, but the resolution is now smaller than 1 nanosecond on multi-GHz machines and the accuracy is heading towards 1 nanosecond too). Arches that support GUPROF must now provide certain macros for the calibration. GUPROF is now only supported for i386's, so the absence of the new macros for other arches doesn't break anything that wasn't already broken. amd64's have uncommitted support for GUPROF, and sparc64's have support that seems to be complete except here (there was an #error for non-i386 cases; now there are undefined macros). Changed the asms a little: - declare them as __volatile. They must not be moved, and exporting a label across asms is technically incorrect, so try harder to stop gcc moving them. - don't put the non-clobbered register "bx" in the clobber list. The clobber lists are still more conservative than necessary. - drop the non-support for gcc-1. It just gave a better error message, and this is not useful since compiling with gcc-1 would cause thousands of worse error messages. - drop the support for aout. Notes: svn path=/head/; revision=129498
* Remove advertising clause from University of California Regent's license,Warner Losh2004-04-051-4/+0
| | | | | | | | | per letter dated July 22, 1999. Approved by: core Notes: svn path=/head/; revision=127911
* These are changes to allow to use the Intel C/C++ compiler (lang/icc)Tom Rhodes2004-03-121-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | to build the kernel. It doesn't affect the operation if gcc. Most of the changes are just adding __INTEL_COMPILER to #ifdef's, as icc v8 may define __GNUC__ some parts may look strange but are necessary. Additional changes: - in_cksum.[ch]: * use a generic C version instead of the assembly version in the !gcc case (ASM code breaks with the optimizations icc does) -> no bad checksums with an icc compiled kernel Help from: andre, grehan, das Stolen from: alpha version via ppc version The entire checksum code should IMHO be replaced with the DragonFly version (because it isn't guaranteed future revisions of gcc will include similar optimizations) as in: ---snip--- Revision Changes Path 1.12 +1 -0 src/sys/conf/files.i386 1.4 +142 -558 src/sys/i386/i386/in_cksum.c 1.5 +33 -69 src/sys/i386/include/in_cksum.h 1.5 +2 -0 src/sys/netinet/igmp.c 1.6 +0 -1 src/sys/netinet/in.h 1.6 +2 -0 src/sys/netinet/ip_icmp.c 1.4 +3 -4 src/contrib/ipfilter/ip_compat.h 1.3 +1 -2 src/sbin/natd/icmp.c 1.4 +0 -1 src/sbin/natd/natd.c 1.48 +1 -0 src/sys/conf/files 1.2 +0 -1 src/sys/conf/files.amd64 1.13 +0 -1 src/sys/conf/files.i386 1.5 +0 -1 src/sys/conf/files.pc98 1.7 +1 -1 src/sys/contrib/ipfilter/netinet/fil.c 1.10 +2 -3 src/sys/contrib/ipfilter/netinet/ip_compat.h 1.10 +1 -1 src/sys/contrib/ipfilter/netinet/ip_fil.c 1.7 +1 -1 src/sys/dev/netif/txp/if_txp.c 1.7 +1 -1 src/sys/net/ip_mroute/ip_mroute.c 1.7 +1 -2 src/sys/net/ipfw/ip_fw2.c 1.6 +1 -2 src/sys/netinet/igmp.c 1.4 +158 -116 src/sys/netinet/in_cksum.c 1.6 +1 -1 src/sys/netinet/ip_gre.c 1.7 +1 -2 src/sys/netinet/ip_icmp.c 1.10 +1 -1 src/sys/netinet/ip_input.c 1.10 +1 -2 src/sys/netinet/ip_output.c 1.13 +1 -2 src/sys/netinet/tcp_input.c 1.9 +1 -2 src/sys/netinet/tcp_output.c 1.10 +1 -1 src/sys/netinet/tcp_subr.c 1.10 +1 -1 src/sys/netinet/tcp_syncache.c 1.9 +1 -2 src/sys/netinet/udp_usrreq.c 1.5 +1 -2 src/sys/netinet6/ipsec.c 1.5 +1 -2 src/sys/netproto/ipsec/ipsec.c 1.5 +1 -1 src/sys/netproto/ipsec/ipsec_input.c 1.4 +1 -2 src/sys/netproto/ipsec/ipsec_output.c and finally remove sys/i386/i386 in_cksum.c sys/i386/include in_cksum.h ---snip--- - endian.h: * DTRT in C++ mode - quad.h: * we don't use gcc v1 anymore, remove support for it Suggested by: bde (long ago) - assym.h: * avoid zero-length arrays (remove dependency on a gcc specific feature) This change changes the contents of the object file, but as it's only used to generate some values for a header, and the generator knows how to handle this, there's no impact in the gcc case. Explained by: bde Submitted by: Marius Strobl <marius@alchemy.franken.de> - aicasm.c: * minor change to teach it about the way icc spells "-nostdinc" Not approved by: gibbs (no reply to my mail) - bump __FreeBSD_version (lang/icc needs to know about the changes) Incarnations of this patch survive gcc compiles since a loooong time, I use it on my desktop. An icc compiled kernel works since Nov. 2003 (exceptions: snd_* if used as modules), it survives a build of the entire ports collection with icc. Parts of this commit contains suggestions or submissions from Marius Strobl <marius@alchemy.franken.de>. Reviewed by: -arch Submitted by: netchild Notes: svn path=/head/; revision=126891
* Use __FBSDID().David E. O'Brien2003-06-111-1/+3
| | | | Notes: svn path=/head/; revision=116182
* remove old and inaccurate XXX comment.Julian Elischer2003-05-021-1/+0
| | | | Notes: svn path=/head/; revision=114482
* - Move PS_PROFIL and its new cousin PS_STOPPROF back over to p_flag andJohn Baldwin2003-04-221-21/+13
| | | | | | | | | | rename them appropriately. Protect both flags with both the proc lock and the sched_lock. - Protect p_profthreads with the proc lock. - Remove Giant from profil(2). Notes: svn path=/head/; revision=113874
* Back out M_* changes, per decision of the TRB.Warner Losh2003-02-191-2/+2
| | | | | | | Approved by: trb Notes: svn path=/head/; revision=111119
* Move a bunch of flags from the KSE to the thread.Julian Elischer2003-02-171-5/+5
| | | | | | | | | | | I was in two minds as to where to put them in the first case.. I should have listenned to the other mind. Submitted by: parts by davidxu@ Reviewed by: jeff@ mini@ Notes: svn path=/head/; revision=111032
* A little infrastructure, preceding some upcoming changesJulian Elischer2003-02-081-21/+46
| | | | | | | | | | to the profiling and statistics code. Submitted by: DavidXu@ Reviewed by: peter@ Notes: svn path=/head/; revision=110530
* Reversion of commit by Davidxu plus fixes since applied.Julian Elischer2003-02-011-47/+22
| | | | | | | | | | | I'm not convinced there is anything major wrong with the patch but them's the rules.. I am using my "David's mentor" hat to revert this as he's offline for a while. Notes: svn path=/head/; revision=110190
* Move UPCALL related data structure out of kse, introduce a newDavid Xu2003-01-261-22/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | data structure called kse_upcall to manage UPCALL. All KSE binding and loaning code are gone. A thread owns an upcall can collect all completed syscall contexts in its ksegrp, turn itself into UPCALL mode, and takes those contexts back to userland. Any thread without upcall structure has to export their contexts and exit at user boundary. Any thread running in user mode owns an upcall structure, when it enters kernel, if the kse mailbox's current thread pointer is not NULL, then when the thread is blocked in kernel, a new UPCALL thread is created and the upcall structure is transfered to the new UPCALL thread. if the kse mailbox's current thread pointer is NULL, then when a thread is blocked in kernel, no UPCALL thread will be created. Each upcall always has an owner thread. Userland can remove an upcall by calling kse_exit, when all upcalls in ksegrp are removed, the group is atomatically shutdown. An upcall owner thread also exits when process is in exiting state. when an owner thread exits, the upcall it owns is also removed. KSE is a pure scheduler entity. it represents a virtual cpu. when a thread is running, it always has a KSE associated with it. scheduler is free to assign a KSE to thread according thread priority, if thread priority is changed, KSE can be moved from one thread to another. When a ksegrp is created, there is always N KSEs created in the group. the N is the number of physical cpu in the current system. This makes it is possible that even an userland UTS is single CPU safe, threads in kernel still can execute on different cpu in parallel. Userland calls kse_create to add more upcall structures into ksegrp to increase concurrent in userland itself, kernel is not restricted by number of upcalls userland provides. The code hasn't been tested under SMP by author due to lack of hardware. Reviewed by: julian Notes: svn path=/head/; revision=109877
* Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.Alfred Perlstein2003-01-211-2/+2
| | | | | | | Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT. Notes: svn path=/head/; revision=109623
* Fix warnings & errors caused by my last commit.Poul-Henning Kamp2003-01-071-2/+1
| | | | Notes: svn path=/head/; revision=108893
* This is all "#if defined(__i386__) && __GNUC__ >= 2":Poul-Henning Kamp2003-01-061-0/+47
| | | | | | | | | | | | | | | | Add support for GCC's --test-coverage --profile-arcs options. Add code to call the functions listed in the .ctors section, these are used to string the per .o file counter blocks into a linked list. Add empty __bb_fork_func() to cope with GCC magic gandling of exec*() named functions. To add support for other platforms should be trivial, but involves determining the exact data-types gcc uses on that platform. Notes: svn path=/head/; revision=108779
* Don't #error if we are lint.Poul-Henning Kamp2002-10-011-0/+2
| | | | Notes: svn path=/head/; revision=104285
* more caddr_t removal.Alfred Perlstein2002-06-291-2/+2
| | | | Notes: svn path=/head/; revision=99012
* Remove __P.Alfred Perlstein2002-03-191-1/+1
| | | | Notes: svn path=/head/; revision=92723
* - Change all callers of addupc_task() to check PS_PROFIL explicitly andJohn Baldwin2001-12-181-2/+1
| | | | | | | | | | | remove the check from addupc_task(). It would need sched_lock while testing the flag anyways. - Always read sticks while holding sched_lock using a temporary variable where needed. - Always init prticks to 0 in ast() to quiet a warning. Notes: svn path=/head/; revision=88119
* Modify the critical section API as follows:John Baldwin2001-12-181-6/+4
| | | | | | | | | | | | | | | | | | | | | | - The MD functions critical_enter/exit are renamed to start with a cpu_ prefix. - MI wrapper functions critical_enter/exit maintain a per-thread nesting count and a per-thread critical section saved state set when entering a critical section while at nesting level 0 and restored when exiting to nesting level 0. This moves the saved state out of spin mutexes so that interlocking spin mutexes works properly. - Most low-level MD code that used critical_enter/exit now use cpu_critical_enter/exit. MI code such as device drivers and spin mutexes use the MI wrappers. Note that since the MI wrappers store the state in the current thread, they do not have any return values or arguments. - mtx_intr_enable() is replaced with a constant CRITICAL_FORK which is assigned to curthread->td_savecrit during fork_exit(). Tested on: i386, alpha Notes: svn path=/head/; revision=88088
* Add kmupetext(), a function that expands the range of memory coveredBrian Feldman2001-10-301-5/+64
| | | | | | | | | | | | by the profiler on a running system. This is not done sparsely, as memory is cheaper than processor speed and each gprof mcount() and mexitcount() operation is already very expensive. Obtained from: NAI Labs CBOSS project Funded by: DARPA Notes: svn path=/head/; revision=85733
* KSE Milestone 2Julian Elischer2001-09-121-11/+12
| | | | | | | | | | | | | | | | | Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha Notes: svn path=/head/; revision=83366
* Pushdown Giant for: profil(), ntp_adjtime(), ogethostname(),Matthew Dillon2001-09-011-4/+14
| | | | | | | osethostname(), ogethostid(), osethostid() Notes: svn path=/head/; revision=82717
* - Close races with signals and other AST's being triggered while we are inJohn Baldwin2001-08-101-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | the process of exiting the kernel. The ast() function now loops as long as the PS_ASTPENDING or PS_NEEDRESCHED flags are set. It returns with preemption disabled so that any further AST's that arrive via an interrupt will be delayed until the low-level MD code returns to user mode. - Use u_int's to store the tick counts for profiling purposes so that we do not need sched_lock just to read p_sticks. This also closes a problem where the call to addupc_task() could screw up the arithmetic due to non-atomic reads of p_sticks. - Axe need_proftick(), aston(), astoff(), astpending(), need_resched(), clear_resched(), and resched_wanted() in favor of direct bit operations on p_sflag. - Fix up locking with sched_lock some. In addupc_intr(), use sched_lock to ensure pr_addr and pr_ticks are updated atomically with setting PS_OWEUPC. In ast() we clear pr_ticks atomically with clearing PS_OWEUPC. We also do not grab the lock just to test a flag. - Simplify the handling of Giant in ast() slightly. Reviewed by: bde (mostly) Notes: svn path=/head/; revision=81493
* We don't need to hold a lock just to test a flag.John Baldwin2001-06-061-5/+1
| | | | Notes: svn path=/head/; revision=77840
* Remove unneeded includes of sys/ipl.h and machine/ipl.h.John Baldwin2001-05-151-1/+0
| | | | Notes: svn path=/head/; revision=76650
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