poll: randomize order in which to wake multiple waiters

If several processes are waiting for an incoming connection via poll,
currently the first process in the wakeup-queue will be woken up first.

poll: randomize order in which to wake multiple waiters

If several processes are waiting for an incoming connection via poll,
currently the first process in the wakeup-queue will be woken up first.
This leads to an uneven distribution of connections. This patch randomizes
which process to wakeup first.

This change is tunable via /etc/system, randomize_pollwakeup and is by
default turned off (0).

refs #3226

(cherry picked from commit 90564eafd43d33fd880045ac0b1455f91b776573)

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3150 poll times out immediately in 32bit kernels
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Appr

3150 poll times out immediately in 32bit kernels
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Robert Mustacchi <rm@joyent.com>

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3112 ztest does not honor ZFS_DEBUG
3113 ztest should use watchpoints to protect frozen arc bufs
3114 some leaked nvlists in zfsdev_ioctl
3115 poll(2) returns prematurely in presence of spurious wake

3112 ztest does not honor ZFS_DEBUG
3113 ztest should use watchpoints to protect frozen arc bufs
3114 some leaked nvlists in zfsdev_ioctl
3115 poll(2) returns prematurely in presence of spurious wakeups
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matt Amdur <Matt.Amdur@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <chris.siden@delphix.com>
Approved by: Eric Schrock <eric.schrock@delphix.com>

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1605 System time changes combined with spurios wakeups cause DP_POLL to return prematurely
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <gwilson@delphix.com>
Reviewed by:

1605 System time changes combined with spurios wakeups cause DP_POLL to return prematurely
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <gwilson@delphix.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Eric Schrock <Eric.Schrock@delphix.com>

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PSARC 2009/657 delete obsolete system call traps
6906485 delete obsolete system call traps

--HG--
rename : usr/src/cmd/truss/xstat.c => usr/src/cmd/truss/stat.c
rename : usr/src/lib/libc/port/gen/du

PSARC 2009/657 delete obsolete system call traps
6906485 delete obsolete system call traps

--HG--
rename : usr/src/cmd/truss/xstat.c => usr/src/cmd/truss/stat.c
rename : usr/src/lib/libc/port/gen/dup2.c => usr/src/lib/libc/port/gen/dup.c
rename : usr/src/lib/libc/port/sys/libc_fcntl.c => usr/src/lib/libc/port/sys/fcntl.c
rename : usr/src/lib/libc/port/sys/libc_open.c => usr/src/lib/libc/port/sys/open.c

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PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
6860030 tickless clock requires a clock() decoupled lbolt / lbolt64
Portions contributed by Chad Mynhier <cmynhier@gmail.com>

backout 6352258: needs more work

6352258 poll can be tricked into allocating WAY too much memory

6517813 apache2 triggers panic in checkwfdlist()

6812228 No need to do software checksum for multiple-mblk packets in ip_tcp_input()
6694625 Performance falls off the cliff with large IO sizes
PSARC/2009/039 prefetch interfaces
6812282 PSARC 2009/0

6812228 No need to do software checksum for multiple-mblk packets in ip_tcp_input()
6694625 Performance falls off the cliff with large IO sizes
PSARC/2009/039 prefetch interfaces
6812282 PSARC 2009/039 prefetch interfaces
Contributed by Paul Durrant (pdurrant@solarflare.com)

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6555476 pcacheset_cmp is inefficient (fix gcc build)

6555476 pcacheset_cmp is inefficient

PSARC/2007/218 caller_context_t in all VOPs
PSARC/2007/227 VFS Feature Registration and ACL on Create
PSARC/2007/244 ZFS Case-insensitive support
PSARC/2007/315 Extensible Attribute Interfaces
PSARC/

PSARC/2007/218 caller_context_t in all VOPs
PSARC/2007/227 VFS Feature Registration and ACL on Create
PSARC/2007/244 ZFS Case-insensitive support
PSARC/2007/315 Extensible Attribute Interfaces
PSARC/2007/394 ls(1) new command line options '-/' and '-%': CIFS system attributes support
PSARC/2007/403 Modified Access Checks for CIFS
PSARC/2007/410 Add system attribute support to chmod(1)
PSARC/2007/432 CIFS system attributes support for cp(1), pack(1), unpack(1), compress(1) and uncompress(1)
PSARC/2007/444 Rescind SETTABLE Attribute
PSARC/2007/459 CIFS system attributes support for cpio(1), pax(1), tar(1)
PSARC/2007/546 Update utilities to match CIFS system attributes changes.
PSARC/2007/560 ZFS sharesmb property
4890717 want append-only files
6417428 Case-insensitive file system name lookup to support CIFS
6417435 DOS attributes and additional timestamps to support for CIFS
6417442 File system quarantined and modified attributes to support an integrated Anti-Virus service
6417453 FS boolean property for rejecting/allowing invalid UTF-8 sequences in file names
6473733 RFE: Need support for open-deny modes
6473755 RFE: Need ability to reconcile oplock and delegation conflicts
6494624 sharemgr needs to support CIFS shares better
6546705 All vnode operations need to pass caller_context_t
6546706 Need VOP_SETATTR/VOP_GETATTR to support new, optional attributes
6546893 Solaris system attribute support
6550962 ZFS ACL inheritance needs to be enhanced to support Automatic Inheritance
6553589 RFE: VFS Feature Registration facility
6553770 RFE: ZFS support for ACL-on-CREATE (PSARC 2007/227)
6565581 ls(1) should support file system attributes proposed in PSARC/2007/315
6566784 NTFS streams are not copied along with the files.
6576205 cp(1), pack(1) and compress(1) should support file system attributes proposed in PSARC/2007/315
6578875 RFE: kernel interfaces for nbmand need improvement
6578883 RFE: VOP_SHRLOCK needs additional access types
6578885 chmod(1) should support file system attributes proposed in PSARC/2007/315
6578886 RFE: disallow nbmand state to change on remount
6583349 ACL parser needs to support audit/alarm ACE types
6590347 tar(1) should support filesystem attributes proposed in PSARC/2007/315
6597357 *tar* xv@ doesn't show the hidden directory even though it is restored
6597360 *tar* should re-init xattr info if openat() fails during extraction of and extended attribute
6597368 *tar* cannot restore hard linked extended attributes
6597374 *tar* doesn't display "x " when hard linked attributes are restored
6597375 *tar* extended attribute header off by one
6614861 *cpio* incorrectly archives extended system attributes with -@
6614896 *pax* incorrectly archives extended system attributes with -@
6615225 *tar* incorrectly archives extended system attributes with -@
6617183 CIFS Service - PSARC 2006/715

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backout 6265036/6531693: causes 6544953

6422458 /dev/poll dp_nfds checking off-by-one; application failures ensue

6265036 cv_waituntil_sig() often returns early

6468901 recursive mutex_enter in pollwakeup

PSARC 2005/706 SIGEV_THREAD and SIGEV_PORT
4017841 The SIGEV_THREAD option for event notification not implemented

6357796 Panic on event port on port_close_pfd
6358194 Deadlock panic on port_dissociate
6362390 "Deadlock: cycle in blocking chain" panic in portfs code
6367349 Panic on port_remove_event_doneq
63744

6357796 Panic on event port on port_close_pfd
6358194 Deadlock panic on port_dissociate
6362390 "Deadlock: cycle in blocking chain" panic in portfs code
6367349 Panic on port_remove_event_doneq
6374407 port_getn does not dissociate fd when it reports an event on it
6362558 system panics in port_associate_ksource

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4790586 bogus coding in kstrputmsg()
4868000 dblk_constructor() ASSERT() is off-by-one
5087794 strdoioctl() block comment is incorrect
6227620 poll's p_fno_ctl check is off-by-one
6325582 maxsepgcnt:

4790586 bogus coding in kstrputmsg()
4868000 dblk_constructor() ASSERT() is off-by-one
5087794 strdoioctl() block comment is incorrect
6227620 poll's p_fno_ctl check is off-by-one
6325582 maxsepgcnt: proof of STREAMS in other SunOS systems

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