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4e32b7b3cc
freebsd-skq/sys
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David Xu 4e32b7b3cc Add a lwpid field into per-cpu structure, the lwpid represents current 
running thread's id on each cpu. This allow us to add in-kernel adaptive
spin for user level mutex. While spinning in user space is possible,
without correct thread running state exported from kernel, it hardly
can be implemented efficiently without wasting cpu cycles, however
exporting thread running state unlikely will be implemented soon as
it has to design and stablize interfaces. This implementation is
transparent to user space, it can be disabled dynamically. With this
change, mutex ping-pong program's performance is improved massively on
SMP machine. performance of mysql super-smack select benchmark is increased
about 7% on Intel dual dual-core2 Xeon machine, it indicates on systems
which have bunch of cpus and system-call overhead is low (athlon64, opteron,
and core-2 are known to be fast), the adaptive spin does help performance.

Added sysctls:
    kern.threads.umtx_dflt_spins
        if the sysctl value is non-zero, a zero umutex.m_spincount will
        cause the sysctl value to be used a spin cycle count.
    kern.threads.umtx_max_spins
        the sysctl sets upper limit of spin cycle count.

Tested on: Athlon64 X2 3800+, Dual Xeon 5130
2006-12-20 04:40:39 +00:00
..
amd64 Add a lwpid field into per-cpu structure, the lwpid represents current 2006-12-20 04:40:39 +00:00
arm Align the interfaces for the various watchdogs and make the interface 2006-12-15 21:44:49 +00:00
boot add an interface for passing the entire kernel size up front to the 2006-12-18 07:35:14 +00:00
bsm Merge OpenBSM 1.0 alpha 12 import changes into src/sys/bsm. New events 2006-09-25 12:22:07 +00:00
cam Make cam_xpt's pronouncements match camcontrol 2006-12-10 05:37:48 +00:00
coda change vop_lock handling to allowing tracking of callers' file and line for 2006-11-13 05:51:22 +00:00
compat MFP4: 109653 2006-12-04 22:46:09 +00:00
conf build new mdesc file 2006-12-18 07:26:35 +00:00
contrib This commit was generated by cvs2svn to compensate for changes in r165182, 2006-12-13 19:26:37 +00:00
crypto Initialize T1 to silent gcc warning. 2006-10-22 02:19:33 +00:00
ddb Threading cleanup.. part 2 of several. 2006-12-06 06:34:57 +00:00
dev - Use the re_tick() callout instead of if_slowtimo() for driving 2006-12-20 02:13:59 +00:00
fs For big-endian version of getulong() macro, cast result to u_int32_t. 2006-12-19 02:31:58 +00:00
gdb Convert to new console api 2006-05-26 13:54:27 +00:00
geom Softc may be NULL in g_journal_orphan(), so don't be surprised. 2006-12-02 09:10:29 +00:00
gnu Previously, the mount_ext2fs binary listed the acceptable mount 2006-11-18 18:22:11 +00:00
i4b Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
i386 Add a lwpid field into per-cpu structure, the lwpid represents current 2006-12-20 04:40:39 +00:00
ia64 Add a lwpid field into per-cpu structure, the lwpid represents current 2006-12-20 04:40:39 +00:00
isa Optimized RTC accesses by avoiding null writes to the index register 2006-12-03 03:49:28 +00:00
isofs/cd9660 The ISO9660 spec does allow files up to 4G. Change the i_size 2006-12-08 07:43:53 +00:00
kern Add a lwpid field into per-cpu structure, the lwpid represents current 2006-12-20 04:40:39 +00:00
libkern Add strstr() function to the libkern. 2006-08-12 15:28:39 +00:00
modules Remove stall comment. 2006-12-18 18:57:41 +00:00
net MFp4: 92972, 98913 + one more change 2006-12-12 12:17:58 +00:00
net80211 Fix packing on the country band descriptor. No real change since this 2006-12-01 18:40:51 +00:00
netatalk Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
netatm Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
netgraph Correctly calculate length of IP header. 2006-12-12 12:35:06 +00:00
netinet o made in kernel libalias mpsafe 2006-12-15 12:50:06 +00:00
netinet6 In ip6_sprintf print the addresses in a more common/readable 2006-12-16 14:15:31 +00:00
netipsec s,#if INET6,#ifdef INET6, 2006-12-14 17:33:46 +00:00
netipx Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
netkey With exception of the if_name() macro, all definitions in net_osdep.h 2006-08-04 21:27:40 +00:00
netnatm Change semantics of socket close and detach. Add a new protocol switch 2006-07-21 17:11:15 +00:00
netncp Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
netsmb Sweep kernel replacing suser(9) calls with priv(9) calls, assigning 2006-11-06 13:42:10 +00:00
nfs NFSv4 client: 2006-11-28 19:33:28 +00:00
nfs4client NFSv4 client: 2006-11-28 19:33:28 +00:00
nfsclient NetApp filers return corrupt post op attrs in the wcc on NFS error responses. 2006-12-11 19:54:25 +00:00
nfsserver MFp4: 92972, 98913 + one more change 2006-12-12 12:17:58 +00:00
opencrypto When DIAGNOSTIC is defined, verify if we don't free crypto requests from 2006-06-06 15:04:52 +00:00
pc98 Allow machdep.cpu_idle_hlt to be set from the loader. This should allow 2006-12-06 18:27:17 +00:00
pccard
pci Don't assume IF_LLADDR returns aligned memory address. 2006-12-18 01:38:10 +00:00
powerpc Remove bogus increment of re-hashed PTEG index. This snuck in with r1.12 of 2006-12-20 01:10:21 +00:00
rpc
security Teach the MAC policies which utilize mbuf labeling the new syncache 2006-12-13 06:03:22 +00:00
sparc64 add new large page sizes for use by shared loader 2006-12-18 07:28:59 +00:00
sun4v remove unneeded operations in tsb_set_tte_real - the function is 2006-12-18 07:46:59 +00:00
sys Add a lwpid field into per-cpu structure, the lwpid represents current 2006-12-20 04:40:39 +00:00
tools Check for errors when registering and unregistering firmware modules. This 2006-06-16 21:06:03 +00:00
ufs change vop_lock handling to allowing tracking of callers' file and line for 2006-11-13 05:51:22 +00:00
vm Optimize vm_object_split(). Specifically, make the number of iterations 2006-12-17 20:14:43 +00:00
Makefile o Add cam to a list of cscope dirs. 2006-11-26 18:27:16 +00:00