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2017-01-26tools/virtio/ringtest: fix run-on-all.sh for offline cpusHalil Pasic1-2/+3
commit 21f5eda9b8671744539c8295b9df62991fffb2ce upstream. Since ef1b144d ("tools/virtio/ringtest: fix run-on-all.sh to work without /dev/cpu") run-on-all.sh uses seq 0 $HOST_AFFINITY as the list of ids of the CPUs to run the command on (assuming ids of online CPUs are consecutive and start from 0), where $HOST_AFFINITY is the highest CPU id in the system previously determined using lscpu. This can fail on systems with offline CPUs. Instead let's use lscpu to determine the list of online CPUs. Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com> Fixes: ef1b144d ("tools/virtio/ringtest: fix run-on-all.sh to work without /dev/cpu") Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-15tools/virtio: fix READ_ONCE()Mark Rutland1-1/+1
commit 5da889c795b1fbefc9d8f058b54717ab8ab17891 upstream. The virtio tools implementation of READ_ONCE() has a single parameter called 'var', but erroneously refers to 'val' for its cast, and thus won't work unless there's a variable of the correct type that happens to be called 'var'. Fix this with s/var/val/, making READ_ONCE() work as expected regardless. Fixes: a7c490333df3cff5 ("tools/virtio: use virt_xxx barriers") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: linux-kernel@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-10-31ringtest: poll for new buffers once before updating event indexPaolo Bonzini1-2/+2
Updating the event index has a memory barrier and causes more work on the other side to actually signal the event. It is unnecessary if a new buffer has already appeared on the ring, so poll once before doing the update. The effect of this on the 0.9 ring implementation is pretty much invisible, but on the new-style ring it provides a consistent 3% performance improvement. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31ringtest: commonize implementation of poll_avail/poll_usedPaolo Bonzini6-83/+43
Provide new primitives used_empty/avail_empty and build poll_avail/poll_used on top of it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31ringtest: use link-time optimizationPaolo Bonzini2-4/+4
By using -flto and -fwhole-program, all functions from the ring implementation can be treated as static and possibly inlined. Force this to happen through the GCC flatten attribute. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-15tools/virtio: add dma stubsMichael S. Tsirkin5-1/+52
Fixes build after recent IOMMU-related changes, mustly by adding more stubs. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-08-15ringtest: test build fixMichael S. Tsirkin1-0/+1
Recent changes to ptr_ring broke the ringtest which lacks a likely() stub. Fix it up. Fixes: 982fb490c298896d15e9323a882f34a57c11ff56 ("ptr_ring: support zero length ring") Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-07-01ptr_ring: support resizing multiple queuesMichael S. Tsirkin1-0/+5
Sometimes, we need support resizing multiple queues at once. This is because it was not easy to recover to recover from a partial failure of multiple queues resizing. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-30Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller4-3/+78
Several cases of overlapping changes, except the packet scheduler conflicts which deal with the addition of the free list parameter to qdisc_enqueue(). Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-15ptr_ring: ring testMichael S. Tsirkin2-1/+196
Add ringtest based unit test for ptr ring. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-06tools/virtio: add noring toolMichael S. Tsirkin2-1/+72
Useful to measure testing framework overhead. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-06-06tools/virtio/ringtest: fix run-on-all.sh to work without /dev/cpuMike Rapoport1-2/+2
/dev/cpu is only available on x86 with certain modules (e.g. msr) enabled. Using lscpu to get processors count is more portable. Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-06-06tools/virtio/ringtest: add usage example to READMEMike Rapoport1-0/+4
Having typical usage example in the README file is more convinient than in the git history... Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-05-22ringtest: pass buf != NULLMichael S. Tsirkin1-1/+1
just a stub pointer for now. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-05-22virtio: add inorder optionMichael S. Tsirkin3-2/+54
skips ring accesses but drops out of order support Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-03-02virtio_ring: Support DMA APIsAndy Lutomirski1-0/+17
virtio_ring currently sends the device (usually a hypervisor) physical addresses of its I/O buffers. This is okay when DMA addresses and physical addresses are the same thing, but this isn't always the case. For example, this never works on Xen guests, and it is likely to fail if a physical "virtio" device ever ends up behind an IOMMU or swiotlb. The immediate use case for me is to enable virtio on Xen guests. For that to work, we need vring to support DMA address translation as well as a corresponding change to virtio_pci or to another driver. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-01-26tools/virtio: add ringtest utilitiesMichael S. Tsirkin8-0/+1123
This adds micro-benchmarks useful for tuning virtio ring layouts. Three layouts are currently implemented: - virtio 0.9 compatible one - an experimental extension bypassing the ring index, polling ring itself instead - an experimental extension bypassing avail and used ring completely Typical use: sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring It doesn't depend on the kernel directly, but it's handy to have as much virtio stuff as possible in one tree. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-01-26tools/virtio: use virt_xxx barriersMichael S. Tsirkin3-9/+23
Fix build after API changes. Reported-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-12-07tools/virtio: fix byteswap logicMichael S. Tsirkin1-7/+13
commit cf561f0d2eb74574ad9985a2feab134267a9d298 ("virtio: introduce virtio_is_little_endian() helper") changed byteswap logic to skip feature bit checks for LE platforms, but didn't update tools/virtio, so vring_bench started failing. Update the copy under tools/virtio/ (TODO: find a way to avoid this code duplication). Cc: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-12-07tools/virtio: move list macro stubsMichael S. Tsirkin2-6/+6
Makes them more generally available. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-09-16tools/virtio: propagate V=X to kernel buildMichael S. Tsirkin1-1/+1
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-09-09tools/virtio: fix build after 4.2 changesMichael S. Tsirkin3-0/+13
more stubs, mostly Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: add virtio 1.0 in vringh_testMichael S. Tsirkin1-0/+2
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: add virtio 1.0 in virtio_testMichael S. Tsirkin1-1/+13
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: enable -WerrorMichael S. Tsirkin1-1/+1
Seems to mostly be a positive. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: 64 bit featuresMichael S. Tsirkin1-1/+1
Missed one place where vringh_test used long to pass features. Fix it up to u64. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: fix vringh testMichael S. Tsirkin1-0/+1
Include missing virtio_config.h Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-16tools/virtio: more stubsMichael S. Tsirkin5-2/+79
As usual, add more stubs to fix test build after main codebase changes. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-09virtio: add support for 64 bit features.Michael S. Tsirkin1-1/+1
Change u32 to u64, and use BIT_ULL and 1ULL everywhere. Note: transports are unchanged, and only set low 32 bit. This guarantees that no transport sets e.g. VERSION_1 by mistake without proper support. Based on patch by Rusty. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-12-09virtio: use u32, not bitmap for featuresMichael S. Tsirkin4-33/+12
It seemed like a good idea to use bitmap for features in struct virtio_device, but it's actually a pain, and seems to become even more painful when we get more than 32 feature bits. Just change it to a u32 for now. Based on patch by Rusty. Suggested-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-05-01tools: Consolidate types.hBorislav Petkov2-35/+0
Combine all definitions into a common tools/include/linux/types.h and kill the wild growth elsewhere. Move DECLARE_BITMAP to its proper bitmap.h header. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Link: http://lkml.kernel.org/n/tip-azczs7qcv6h9xek9od10hiv2@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-01tools: Unify export.hBorislav Petkov2-6/+1
So tools/ has been growing three, at a different stage of their development export.h headers and so we should unite into one. Add tools/include/ to the include path of virtio and liblockdep to pick the shared header now. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: virtio-dev@lists.oasis-open.org Cc: virtualization@lists.linux-foundation.org Link: http://lkml.kernel.org/r/1397493185-19521-2-git-send-email-bp@alien8.de Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-03-13tools/virtio: add a missing )Joel Stanley1-1/+1
Fixes the following build failure: cc -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -c -o virtio_test.o virtio_test.c virtio_test.c: In function ‘run_test’: virtio_test.c:176:7: error: expected ‘)’ before ‘r’ r = -1; ^ Fixes: 53c18c9906441 (virtio_test: verify if virtqueue_kick() succeeded) Cc: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-03-13tools/virtio: fix missing kmemleak_ignore symbolJoel Stanley1-0/+3
In commit bb478d8b167 virtio_ring: plug kmemleak false positive, kmemleak_ignore was introduced. This broke compilation of virtio_test: cc -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -c -o virtio_ring.o ../../drivers/virtio/virtio_ring.c ../../drivers/virtio/virtio_ring.c: In function ‘vring_add_indirect’: ../../drivers/virtio/virtio_ring.c:177:2: warning: implicit declaration of function ‘kmemleak_ignore’ [-Wimplicit-function-declaration] kmemleak_ignore(desc); ^ cc virtio_test.o virtio_ring.o -o virtio_test virtio_ring.o: In function `vring_add_indirect': tools/virtio/../../drivers/virtio/virtio_ring.c:177: undefined reference to `kmemleak_ignore' Add a dummy header for tools/virtio, and add #incldue <linux/kmemleak.h> to drivers/virtio/virtio_ring.c so it is picked up by the userspace tools. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-03-13tools/virtio: update internal copies of headersJoel Stanley1-2/+2
The virtio headers have changed recently: 5b1bf7cb673 virtio_ring: let virtqueue_{kick()/notify()} return a bool 46f9c2b925a virtio_ring: change host notification API Update the internal copies to fix the build of virtio_test: cc -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -c -o virtio_test.o virtio_test.c In file included from virtio_test.c:15:0: ./linux/virtio.h:76:19: error: conflicting types for ‘vring_new_virtqueue’ struct virtqueue *vring_new_virtqueue(unsigned int index, ^ In file included from ./linux/virtio_ring.h:1:0, from ../../usr/include/linux/vhost.h:17, from virtio_test.c:14: ./linux/../../../include/linux/virtio_ring.h:68:19: note: previous declaration of ‘vring_new_virtqueue’ was here struct virtqueue *vring_new_virtqueue(unsigned int index, virtio_test.c: In function ‘vq_info_add’: virtio_test.c:103:12: warning: passing argument 7 of ‘vring_new_virtqueue’ from incompatible pointer type [enabled by default] vq_notify, vq_callback, "test"); ^ In file included from virtio_test.c:15:0: ./linux/virtio.h:76:19: note: expected ‘void (*)(struct virtqueue *)’ but argument is of type ‘_Bool (*)(struct virtqueue *)’ struct virtqueue *vring_new_virtqueue(unsigned int index, ^ Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-10-29virtio_test: verify if virtqueue_kick() succeededHeinz Graalfs1-1/+2
Verify if a host kick succeeded by checking return value of virtqueue_kick(). Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-10-29virtio_ring: change host notification APIHeinz Graalfs2-5/+11
Currently a host kick error is silently ignored and not reflected in the virtqueue of a particular virtio device. Changing the notify API for guest->host notification seems to be one prerequisite in order to be able to handle such errors in the context where the kick is triggered. This patch changes the notify API. The notify function must return a bool return value. It returns false if the host notification failed. Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-07-15virtio tools: add .gitignoreRamkumar Ramachandra1-0/+3
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-07-09tools/virtio: move module license stub to module.hMichael S. Tsirkin2-3/+5
This fixes build for the vringh test: [linux]$ make -C tools/virtio/ make: Entering directory `/home/mst/scm/linux/tools/virtio' cc -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -c -o vringh.o ../../drivers/vhost/vringh.c ../../drivers/vhost/vringh.c:1010:16: error: expected declaration specifiers or ‘...’ before string constant Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-03-20tools/virtio: remove virtqueue_add_buf() from tests.Rusty Russell3-20/+15
Make the rest of the paths use virtqueue_add_sgs or add_outbuf. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-03-20tools/virtio: make vringh_test use inbuf/outbuf.Rusty Russell2-4/+14
As expected, the simplified accessors are faster. for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers: Before: Using CPUS 0 and 3 Guest: notified 0, pinged 39062-39063(39063) Host: notified 39062-39063(39063), pinged 0 Wall time:1.760000-2.220000(1.789167) After: Using CPUS 0 and 3 Guest: notified 0, pinged 39037-39063(39062) Host: notified 39037-39063(39062), pinged 0 Wall time:1.640000-1.810000(1.676875) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-03-20virtio_ring: virtqueue_add_sgs, to add multiple sgs.Rusty Russell2-0/+23
virtio_scsi can really use this, to avoid the current hack of copying the whole sg array. Some other things get slightly neater, too. This causes a slowdown in virtqueue_add_buf(), which is implemented as a wrapper. This is addressed in the next patches. for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers: Before: Using CPUS 0 and 3 Guest: notified 0, pinged 39009-39063(39062) Host: notified 39009-39063(39062), pinged 0 Wall time:1.700000-1.950000(1.723542) After: Using CPUS 0 and 3 Guest: notified 0, pinged 39062-39063(39063) Host: notified 39062-39063(39063), pinged 0 Wall time:1.760000-2.220000(1.789167) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Reviewed-by: Asias He <asias@redhat.com>
2013-03-20tools/virtio: add vring_test.Rusty Russell3-4/+747
This is mainly to test the drivers/vhost/vringh.c code, but it also uses the drivers/virtio/virtio_ring.c code for the guest side. Usage for testing the basic implementation: ./vringh_test # Test with indirect descriptors ./vringh_test --indirect # Test with indirect descriptors and event indexex ./vringh_test --indirect --eventidx You can run a parallel stress test by adding --parallel to any of the above options. eg ./vringh_test --parallel: Using CPUS 0 and 3 Guest: notified 10107974, pinged 107970 Host: notified 108158, pinged 3172148 ./vringh_test --indirect --eventidx --parallel: Using CPUS 0 and 3 Guest: notified 156357, pinged 156251 Host: notified 156251, pinged 78179 Average of 50 times doing ./vringh_test --indirect --eventidx --parallel: 2.840000-3.040000(2.927292)user Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-03-20tools/virtio: separate headers more.Rusty Russell21-147/+450
This makes them a bit more like the kernel headers, so we can include more real kernel headers in our tests. In addition this means that we don't break tools/virtio with the next patch. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-03-20tools/virtio: fix build for 3.8Michael S. Tsirkin3-3/+9
Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-12-20Merge tag 'virtio-next-for-linus' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull virtio update from Rusty Russell: "Some nice cleanups, and even a patch my wife did as a "live" demo for Latinoware 2012. There's a slightly non-trivial merge in virtio-net, as we cleaned up the virtio add_buf interface while DaveM accepted the mq virtio-net patches." * tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (27 commits) virtio_console: Add support for remoteproc serial virtio_console: Merge struct buffer_token into struct port_buffer virtio: add drv_to_virtio to make code clearly virtio: use dev_to_virtio wrapper in virtio virtio-mmio: Fix irq parsing in command line parameter virtio_console: Free buffers from out-queue upon close virtio: Convert dev_printk(KERN_<LEVEL> to dev_<level>( virtio_console: Use kmalloc instead of kzalloc virtio_console: Free buffer if splice fails virtio: tools: make it clear that virtqueue_add_buf() no longer returns > 0 virtio: scsi: make it clear that virtqueue_add_buf() no longer returns > 0 virtio: rpmsg: make it clear that virtqueue_add_buf() no longer returns > 0 virtio: net: make it clear that virtqueue_add_buf() no longer returns > 0 virtio: console: make it clear that virtqueue_add_buf() no longer returns > 0 virtio: make virtqueue_add_buf() returning 0 on success, not capacity. virtio: console: don't rely on virtqueue_add_buf() returning capacity. virtio_net: don't rely on virtqueue_add_buf() returning capacity. virtio-net: remove unused skb_vnet_hdr->num_sg field virtio-net: correct capacity math on ring full virtio: move queue_index and num_free fields into core struct virtqueue. ...
2012-12-18virtio: tools: make it clear that virtqueue_add_buf() no longer returns > 0Rusty Russell1-2/+2
We simplified virtqueue_add_buf(), make it clear in the callers. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-12-06tools:virtio: fix compilation warningCong Ding1-1/+1
We do not allow old-style function definition. Always spell foo(void) if a function does not take any parameters. Signed-off-by: Cong Ding <dinggnu@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2012-09-28tools: Fix pthread flag for Makefile of trace-agent used by virtio-traceYoshihiro YUNOMAE1-4/+3
pthread flag should not be -lpthread but -pthread using gcc. The -lpthread links the external multithread library. On the other hand, the -pthread manages both the gcc's preprocessor and linker to be able to compile with pthread. Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-09-28tools: Add guest trace agent as a user toolYoshihiro YUNOMAE6-0/+806
This patch adds a user tool, "trace agent" for sending trace data of a guest to a Host in low overhead. This agent has the following functions: - splice a page of ring-buffer to read_pipe without memory copying - splice the page from write_pipe to virtio-console without memory copying - write trace data to stdout by using -o option - controlled by start/stop orders from a Host Changes in v2: - Cleanup (change fprintf() to pr_err() and an include guard) Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Acked-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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