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| author | Andrey Konovalov <andreyknvl@google.com> | 2019-12-04 16:52:50 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-04 19:44:14 -0800 |
| commit | 8f6a7f96dc29cefe16ab60f06f9c3a43510b96fd (patch) | |
| tree | a5ddd68ba14b0195bf73592aa3454193d2498e8f | |
| parent | 95d23dc27bde0ab4b25f7ade5e2fddc08dd97d9b (diff) | |
| download | linux-8f6a7f96dc29cefe16ab60f06f9c3a43510b96fd.tar.bz2 | |
vhost, kcov: collect coverage from vhost_worker
Add kcov_remote_start()/kcov_remote_stop() annotations to the
vhost_worker() function, which is responsible for processing vhost
works.
Since vhost_worker() threads are spawned per vhost device instance the
common kcov handle is used for kcov_remote_start()/stop() annotations
(see Documentation/dev-tools/kcov.rst for details). As the result kcov
can now be used to collect coverage from vhost worker threads.
Link: http://lkml.kernel.org/r/e49d5d154e5da6c9ada521d2b7ce10a49ce9f98b.1572366574.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Alexander Potapenko <glider@google.com>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Windsor <dwindsor@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/vhost/vhost.c | 6 | ||||
| -rw-r--r-- | drivers/vhost/vhost.h | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 36ca2cf419bf..f44340b41494 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -30,6 +30,7 @@ #include <linux/sched/signal.h> #include <linux/interval_tree_generic.h> #include <linux/nospec.h> +#include <linux/kcov.h> #include "vhost.h" @@ -357,7 +358,9 @@ static int vhost_worker(void *data) llist_for_each_entry_safe(work, work_next, node, node) { clear_bit(VHOST_WORK_QUEUED, &work->flags); __set_current_state(TASK_RUNNING); + kcov_remote_start_common(dev->kcov_handle); work->fn(work); + kcov_remote_stop(); if (need_resched()) schedule(); } @@ -546,6 +549,7 @@ long vhost_dev_set_owner(struct vhost_dev *dev) /* No owner, become one */ dev->mm = get_task_mm(current); + dev->kcov_handle = kcov_common_handle(); worker = kthread_create(vhost_worker, dev, "vhost-%d", current->pid); if (IS_ERR(worker)) { err = PTR_ERR(worker); @@ -571,6 +575,7 @@ err_worker: if (dev->mm) mmput(dev->mm); dev->mm = NULL; + dev->kcov_handle = 0; err_mm: return err; } @@ -682,6 +687,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev) if (dev->worker) { kthread_stop(dev->worker); dev->worker = NULL; + dev->kcov_handle = 0; } if (dev->mm) mmput(dev->mm); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index e9ed2722b633..a123fd70847e 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -173,6 +173,7 @@ struct vhost_dev { int iov_limit; int weight; int byte_weight; + u64 kcov_handle; }; bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len); |