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2009-06-12Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds2-12/+5
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: Provide _sdata in the vmlinux.lds.S file x86: handle initrd that extends into unusable memory
2009-06-12MAINTAINERS: update Eric Miao's email address and statusEric Miao1-5/+5
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2009-06-12fb: add support of LCD display controller on pxa168/910 (base layer)Lennert Buytenhek5-0/+1499
This driver is originally written by Lennert, modified by Green to be feature complete, and ported by Jun Nie and Kevin Liu for pxa168/910 processors. The patch adds support for the on-chip LCD display controller, it currently supports the base (graphics) layer only. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Green Wan <gwan@marvell.com> Cc: Peter Liao <pliao@marvell.com> Signed-off-by: Jun Nie <njun@marvell.com> Signed-off-by: Kevin Liu <kliu5@marvell.com> Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2009-06-12trivial: remove the trivial patch monkey's name from SubmittingPatchesMarkus Heidelberg1-3/+3
It is outdated here and can be found in the MAINTAINERS file. Also remove the URL of the previous maintainer, similar content can be found in the SubmittingPatches file. Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Fix a typo in comment of addrconf_dad_start()Masatake YAMATO1-1/+1
Signed-off-by: Masatake YAMATO <yamato@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: usb: fix missing space typo in docNémeth Márton1-1/+1
Signed-off-by: Márton Németh <nm127@freemail.hu> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: pci hotplug: adding __init/__exit macros to sgi_hotplugPeter Huewe1-2/+2
Trivial patch which adds the __init and __exit macros to the module_init / module_exit functions from drivers/pci/hotplug/sgi_hotplug.c linux version 2.6.30-rc8 Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Remove the hyphen from git commandsMatt Kraai2-2/+2
Signed-off-by: Matt Kraai <kraai@ftbfs.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix ETIMEOUT -> ETIMEDOUT typosJean Delvare5-6/+6
fix ETIMEOUT -> ETIMEDOUT typos Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Kconfig: .ko is normally not included in module namesPavel Machek21-44/+44
.ko is normally not included in Kconfig help, make it consistent. Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: SubmittingPatches: fix typoPavel Machek1-1/+1
Fix typo. Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Documentation/dell_rbu.txt: fix typosMasanori Kobayasi1-2/+2
Remove a period from end of command-line and fix misplaced comma. Signed-off-by: Masanori Kobayasi <zap03216@nifty.ne.jp> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Fix Pavel's address in MAINTAINERSPavel Machek1-1/+1
Fix my address in MAINTAINERS. Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: ftrace:fix description of trace directoryGeunSik Lim1-1/+1
Fix trace source directory from kernel/tracing/ to kernel/trace/. Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: unnecessary (void*) cast removal in sound/oss/msnd.cChris Sanford1-1/+1
This is a trivial patch that removes an unnecessary void pointer cast. Signed-off-by: Chris Sanford <crsanford@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: input/misc: Fix typo in KconfigAlessio Igor Bogani1-1/+1
Signed-off-by: Alessio Igor Bogani <abogani@texware.it> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix grammo in bus_for_each_dev() kerneldocAlex Chiang1-1/+1
Signed-off-by: Alex Chiang <achiang@hp.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: rbtree.txt: fix rb_entry() parameters in sample codeWang Tinggong1-1/+1
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: spelling fix in ppc code commentsSankar P1-1/+1
Fixes a trivial spelling error in powerpc code comments. Signed-off-by: Sankar P <sankar.curiosity@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix typo in bio_alloc kernel docNikanth Karthikesan1-2/+2
Fix typo in bio_alloc kernel doc. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Documentation/rbtree.txt: cleanup kerneldoc of rbtree.txtfigo.zhang1-4/+4
The first formal parameter of the rb_link_node() is a pointer, and the "node" is define a data struct (pls see line 67 and line 73 in the doc), so the actual parameter should use "&data->node". Signed-off-by: Figo.zhang <figo.zhang@kolorific.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Miscellaneous documentation typo fixesMatt LaPlante60-94/+94
Fix various typos in documentation txts. Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix typo milisecond/millisecond for documentation and source comments.Martin Olsson8-9/+9
Signed-off-by: Martin Olsson <martin@minimum.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix typos s/paramter/parameter/ and s/excute/execute/ in ↵Martin Olsson22-27/+27
documentation and source comments. Signed-off-by: Martin Olsson <martin@minimum.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix typo compatiable/compatiability has extra 'a'.Thadeu Lima de Souza Cascardo1-1/+1
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: kernel/power/poweroff.c: whitespace fixManish Katiyar1-1/+1
Fix coding style whitespace fixes. Patch compile tested Before :- total: 1 errors, 0 warnings, 46 lines checked After total: 0 errors, 0 warnings, 46 lines checked Before :- text data bss dec hex filename 107 48 0 155 9b kernel/power/poweroff.o After text data bss dec hex filename 107 48 0 155 9b kernel/power/poweroff.o Signed-off-by: Manish Katiyar <mkatiyar@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: Fix paramater/parameter typo in dmesg and source commentsMartin Olsson2-2/+2
Signed-off-by: Martin Olsson <martin@minimum.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12Trivial: fix typo s/balence/balance/Thadeu Lima de Souza Cascardo1-1/+1
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: typo (en|dis|avail|remove)bale -> (en|dis|avail|remove)ableThadeu Lima de Souza Cascardo12-13/+13
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: mtd: fix Kconfig comment about 'armflash'Paulius Zaleckas1-1/+2
The real 'armflash' map driver is selected by CONFIG_MTD_ARM_INTEGRATOR Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: remove extra spaceViral Mehta1-1/+1
Just for the sake of readability, removing extra space Signed-off-by: Viral Mehta <viral.mehta@einfochips.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fs/inode: Fix typo in file_update_time nanodocWolfram Sang1-1/+1
The advertised flag for not updating the time was wrong. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: fix comment typo in fs/compat.cNikanth Karthikesan1-1/+1
Fix a typo in fs/compat.c Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12trivial: ext2: fix a typo in comment in ext2.hAli Gholami Rudi1-1/+1
Signed-off-by: Ali Gholami Rudi <ali@rudi.ir> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12slab: setup cpu caches later on when interrupts are enabledPekka Enberg1-18/+19
Fixes the following boot-time warning: [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at kernel/smp.c:369 smp_call_function_many+0x56/0x1bc() [ 0.000000] Hardware name: [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30 #492 [ 0.000000] Call Trace: [ 0.000000] [<ffffffff8149e021>] ? _spin_unlock+0x4f/0x5c [ 0.000000] [<ffffffff8108f11b>] ? smp_call_function_many+0x56/0x1bc [ 0.000000] [<ffffffff81061764>] warn_slowpath_common+0x7c/0xa9 [ 0.000000] [<ffffffff810617a5>] warn_slowpath_null+0x14/0x16 [ 0.000000] [<ffffffff8108f11b>] smp_call_function_many+0x56/0x1bc [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff8108f2be>] smp_call_function+0x3d/0x68 [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff81066fd8>] on_each_cpu+0x31/0x7c [ 0.000000] [<ffffffff810f64f5>] do_tune_cpucache+0x119/0x454 [ 0.000000] [<ffffffff81087080>] ? lockdep_init_map+0x94/0x10b [ 0.000000] [<ffffffff818133b0>] ? kmem_cache_init+0x421/0x593 [ 0.000000] [<ffffffff810f69cf>] enable_cpucache+0x68/0xad [ 0.000000] [<ffffffff818133c3>] kmem_cache_init+0x434/0x593 [ 0.000000] [<ffffffff8180987c>] ? mem_init+0x156/0x161 [ 0.000000] [<ffffffff817f8aae>] start_kernel+0x1cc/0x3b9 [ 0.000000] [<ffffffff817f829a>] x86_64_start_reservations+0xaa/0xae [ 0.000000] [<ffffffff817f837f>] x86_64_start_kernel+0xe1/0xe8 [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-12slab,slub: don't enable interrupts during early bootPekka Enberg7-0/+47
As explained by Benjamin Herrenschmidt: Oh and btw, your patch alone doesn't fix powerpc, because it's missing a whole bunch of GFP_KERNEL's in the arch code... You would have to grep the entire kernel for things that check slab_is_available() and even then you'll be missing some. For example, slab_is_available() didn't always exist, and so in the early days on powerpc, we used a mem_init_done global that is set form mem_init() (not perfect but works in practice). And we still have code using that to do the test. Therefore, mask out __GFP_WAIT, __GFP_IO, and __GFP_FS in the slab allocators in early boot code to avoid enabling interrupts. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-12Merge branches 'upstream' and 'ntrig-multitouch' into for-linusJiri Kosina17-51/+841
2009-06-12slab: fix gfp flag in setup_cpu_cache()Pekka Enberg1-1/+1
Fixes the following warning during bootup when compiling with CONFIG_SLAB: [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at kernel/lockdep.c:2282 lockdep_trace_alloc+0x91/0xb9() [ 0.000000] Hardware name: [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30 #491 [ 0.000000] Call Trace: [ 0.000000] [<ffffffff81087d84>] ? lockdep_trace_alloc+0x91/0xb9 [ 0.000000] [<ffffffff81061764>] warn_slowpath_common+0x7c/0xa9 [ 0.000000] [<ffffffff810617a5>] warn_slowpath_null+0x14/0x16 [ 0.000000] [<ffffffff81087d84>] lockdep_trace_alloc+0x91/0xb9 [ 0.000000] [<ffffffff810f5b03>] kmem_cache_alloc_node_notrace+0x26/0xdf [ 0.000000] [<ffffffff81487f4e>] ? setup_cpu_cache+0x7e/0x210 [ 0.000000] [<ffffffff81487fe3>] setup_cpu_cache+0x113/0x210 [ 0.000000] [<ffffffff810f73ff>] kmem_cache_create+0x409/0x486 [ 0.000000] [<ffffffff818131c1>] kmem_cache_init+0x232/0x593 [ 0.000000] [<ffffffff8180987c>] ? mem_init+0x156/0x161 [ 0.000000] [<ffffffff817f8aae>] start_kernel+0x1cc/0x3b9 [ 0.000000] [<ffffffff817f829a>] x86_64_start_reservations+0xaa/0xae [ 0.000000] [<ffffffff817f837f>] x86_64_start_kernel+0xe1/0xe8 [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-12xfs: fix freeing memory in xfs_getbmap()Felix Blyakher1-0/+1
Regression from commit 28e211700a81b0a934b6c7a4b8e7dda843634d2f. Need to free temporary buffer allocated in xfs_getbmap(). Signed-off-by: Felix Blyakher <felixb@sgi.com> Signed-off-by: Hedi Berriche <hedi@sgi.com> Reported-by: Justin Piszcz <jpiszcz@lucidpixels.com> Reviewed-by: Eric Sandeen <sandeen@sandeen.net> Reviewed-by: Christoph Hellwig <hch@lst.de>
2009-06-12[SCSI] Merge branch 'linus'James Bottomley1794-34790/+103078
Conflicts: drivers/message/fusion/mptsas.c fixed up conflict between req->data_len accessors and mptsas driver updates. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-12lguest: add support for indirect ring entriesMark McLoughlin1-12/+29
Support the VIRTIO_RING_F_INDIRECT_DESC feature. This is a simple matter of changing the descriptor walking code to operate on a struct vring_desc* and supplying it with an indirect table if detected. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: suppress notifications in example LauncherRusty Russell1-0/+15
The Guest only really needs to tell us about activity when we're going to listen to the eventfd: normally, we don't want to know. So if there are no available buffers, turn on notifications, re-check, then wait for the Guest to notify us via the eventfd, then turn notifications off again. There's enough else going on that the differences are in the noise. Before: Secs RxKicks TxKicks 1G TCP Guest->Host: 3.94 4686 32815 1M normal pings: 104 142862 1000010 1M 1k pings (-l 120): 57 142026 1000007 After: 1G TCP Guest->Host: 3.76 4691 32811 1M normal pings: 111 142859 997467 1M 1k pings (-l 120): 55 19648 501549 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: try to batch interrupts on network receiveRusty Russell1-1/+16
Rather than triggering an interrupt every time, we only trigger an interrupt when there are no more incoming packets (or the recv queue is full). However, the overhead of doing the select to figure this out is measurable: 1M pings goes from 98 to 104 seconds, and 1G Guest->Host TCP goes from 3.69 to 3.94 seconds. It's close to the noise though. I tested various timeouts, including reducing it as the number of pending packets increased, timing a 1 gigabyte TCP send from Guest -> Host and Host -> Guest (GSO disabled, to increase packet rate). // time tcpblast -o -s 65536 -c 16k 192.168.2.1:9999 > /dev/null Timeout Guest->Host Pkts/irq Host->Guest Pkts/irq Before 11.3s 1.0 6.3s 1.0 0 11.7s 1.0 6.6s 23.5 1 17.1s 8.8 8.6s 26.0 1/pending 13.4s 1.9 6.6s 23.8 2/pending 13.6s 2.8 6.6s 24.1 5/pending 14.1s 5.0 6.6s 24.4 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: avoid sending interrupts to Guest when no activity occurs.Rusty Russell1-0/+9
If we track how many buffers we've used, we can tell whether we really need to interrupt the Guest. This happens as a side effect of spurious notifications. Spurious notifications happen because it can take a while before the Host thread wakes up and sets the VRING_USED_F_NO_NOTIFY flag, and meanwhile the Guest can more notifications. A real fix would be to use wake counts, rather than a suppression flag, but the practical difference is generally in the noise: the interrupt is usually coalesced into a pending one anyway so we just save a system call which isn't clearly measurable. Secs Spurious IRQS 1G TCP Guest->Host: 3.93 58 1M normal pings: 100 72 1M 1k pings (-l 120): 57 492904 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: implement deferred interrupts in example LauncherRusty Russell1-19/+22
Rather than sending an interrupt on every buffer, we only send an interrupt when we're about to wait for the Guest to send us a new one. The console input and network input still send interrupts manually, but the block device, network and console output queues can simply rely on this logic to send interrupts to the Guest at the right time. The patch is cluttered by moving trigger_irq() higher in the code. In practice, two factors make this optimization less interesting: (1) we often only get one input at a time, even for networking, (2) triggering an interrupt rapidly tends to get coalesced anyway. Before: Secs RxIRQS TxIRQs 1G TCP Guest->Host: 3.72 32784 32771 1M normal pings: 99 1000004 995541 100,000 1k pings (-l 120): 5 49510 49058 After: 1G TCP Guest->Host: 3.69 32809 32769 1M normal pings: 99 1000004 996196 100,000 1k pings (-l 120): 5 52435 52361 (Note the interrupt count on 100k pings goes *up*: see next patch). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: remove obsolete LHREQ_BREAK callRusty Russell4-43/+5
We no longer need an efficient mechanism to force the Guest back into host userspace, as each device is serviced without bothering the main Guest process (aka. the Launcher). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: have example Launcher service all devices in separate threadsRusty Russell1-574/+259
Currently lguest has three threads: the main Launcher thread, a Waker thread, and a thread for the block device (because synchronous block was simply too painful to bear). The Waker selects() on all the input file descriptors (eg. stdin, net devices, pipe to the block thread) and when one becomes readable it calls into the kernel to kick the Launcher thread out into userspace, which repeats the poll, services the device(s), and then tells the kernel to release the Waker before re-entering the kernel to run the Guest. Also, to make a slightly-decent network transmit routine, the Launcher would suppress further network interrupts while it set a timer: that signal handler would write to a pipe, which would rouse the Waker which would prod the Launcher out of the kernel to check the network device again. Now we can convert all our virtqueues to separate threads: each one has a separate eventfd for when the Guest pokes the device, and can trigger interrupts in the Guest directly. The linecount shows how much this simplifies, but to really bring it home, here's an strace analysis of single Guest->Host ping before: * Guest sends packet, notifies xmit vq, return control to Launcher * Launcher clears notification flag on xmit ring * Launcher writes packet to TUN device writev(4, [{"\0\0\0\0\0\0\0\0\0\0", 10}, {"\366\r\224`\2058\272m\224vf\274\10\0E\0\0T\0\0@\0@\1\265"..., 98}], 2) = 108 * Launcher sets up interrupt for Guest (xmit ring is empty) write(10, "\2\0\0\0\3\0\0\0", 8) = 0 * Launcher sets up timer for interrupt mitigation setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 505}}, NULL) = 0 * Launcher re-runs guest pread64(10, 0xbfa5f4d4, 4, 0) ... * Waker notices reply packet in tun device (it was in select) select(12, [0 3 4 6 11], NULL, NULL, NULL) = 1 (in [4]) * Waker kicks Launcher out of guest: pwrite64(10, "\3\0\0\0\1\0\0\0", 8, 0) = 0 * Launcher returns from running guest: ... = -1 EAGAIN (Resource temporarily unavailable) * Launcher looks at input fds: select(7, [0 3 4 6], NULL, NULL, {0, 0}) = 1 (in [4], left {0, 0}) * Launcher reads pong from tun device: readv(4, [{"\0\0\0\0\0\0\0\0\0\0", 10}, {"\272m\224vf\274\366\r\224`\2058\10\0E\0\0T\364\26\0\0@"..., 1518}], 2) = 108 * Launcher injects guest notification: write(10, "\2\0\0\0\2\0\0\0", 8) = 0 * Launcher rechecks fds: select(7, [0 3 4 6], NULL, NULL, {0, 0}) = 0 (Timeout) * Launcher clears Waker: pwrite64(10, "\3\0\0\0\0\0\0\0", 8, 0) = 0 * Launcher reruns Guest: pread64(10, 0xbfa5f4d4, 4, 0) = ? ERESTARTSYS (To be restarted) * Signal comes in, uses pipe to wake up Launcher: --- SIGALRM (Alarm clock) @ 0 (0) --- write(8, "\0", 1) = 1 sigreturn() = ? (mask now []) * Waker sees write on pipe: select(12, [0 3 4 6 11], NULL, NULL, NULL) = 1 (in [6]) * Waker kicks Launcher out of Guest: pwrite64(10, "\3\0\0\0\1\0\0\0", 8, 0) = 0 * Launcher exits from kernel: pread64(10, 0xbfa5f4d4, 4, 0) = -1 EAGAIN (Resource temporarily unavailable) * Launcher looks to see what fd woke it: select(7, [0 3 4 6], NULL, NULL, {0, 0}) = 1 (in [6], left {0, 0}) * Launcher reads timeout fd, sets notification flag on xmit ring read(6, "\0", 32) = 1 * Launcher rechecks fds: select(7, [0 3 4 6], NULL, NULL, {0, 0}) = 0 (Timeout) * Launcher clears Waker: pwrite64(10, "\3\0\0\0\0\0\0\0", 8, 0) = 0 * Launcher resumes Guest: pread64(10, "\0p\0\4", 4, 0) .... strace analysis of single Guest->Host ping after: * Guest sends packet, notifies xmit vq, creates event on eventfd. * Network xmit thread wakes from read on eventfd: read(7, "\1\0\0\0\0\0\0\0", 8) = 8 * Network xmit thread writes packet to TUN device writev(4, [{"\0\0\0\0\0\0\0\0\0\0", 10}, {"J\217\232FI\37j\27\375\276\0\304\10\0E\0\0T\0\0@\0@\1\265"..., 98}], 2) = 108 * Network recv thread wakes up from read on tunfd: readv(4, [{"\0\0\0\0\0\0\0\0\0\0", 10}, {"j\27\375\276\0\304J\217\232FI\37\10\0E\0\0TiO\0\0@\1\214"..., 1518}], 2) = 108 * Network recv thread sets up interrupt for the Guest write(6, "\2\0\0\0\2\0\0\0", 8) = 0 * Network recv thread goes back to reading tunfd 13:39:42.460285 readv(4, <unfinished ...> * Network xmit thread sets up interrupt for Guest (xmit ring is empty) write(6, "\2\0\0\0\3\0\0\0", 8) = 0 * Network xmit thread goes back to reading from eventfd read(7, <unfinished ...> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12lguest: use eventfds for device notificationRusty Russell5-6/+116
Currently, when a Guest wants to perform I/O it calls LHCALL_NOTIFY with an address: the main Launcher process returns with this address, and figures out what device to run. A far nicer model is to let processes bind an eventfd to an address: if we find one, we simply signal the eventfd. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Davide Libenzi <davidel@xmailserver.org>
2009-06-12eventfd: export eventfd_signal and eventfd_fget for lguestRusty Russell1-0/+3
lguest wants to attach eventfds to guest notifications, and lguest is usually a module. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> To: Davide Libenzi <davidel@xmailserver.org>
2009-06-12lguest: allow any process to send interruptsRusty Russell3-12/+18
We currently only allow the Launcher process to send interrupts, but it as we already send interrupts from the hrtimer, it's a simple matter of extracting that code into a common set_interrupt routine. As we switch to a thread per virtqueue, this avoids a bottleneck through the main Launcher process. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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