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- From 8147cec9ee8feea9440cf79365709ddc32ff57d5 Mon Sep 17 00:00:00 2001
- From: Alexandru Ardelean <ardeleanalex@gmail.com>
- Date: Thu, 4 Feb 2016 09:20:34 +0200
- Subject: [PATCH] lib/ovs-thread: Ensure that thread stacks are always at least
- 512 kB.
-
- This makes a difference for libc implementations (such as musl libc) that
- have a really small default pthread stack size.
-
- Will reference this discussion:
- http://patchwork.ozlabs.org/patch/572340/
-
- Reported-by: Robert McKay <robert@mckay.com>
- Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
- [blp@ovn.org made style changes]
- Signed-off-by: Ben Pfaff <blp@ovn.org>
- ---
- lib/ovs-thread.c | 29 +++++++++++++++++++++++++++++
- 1 file changed, 29 insertions(+)
-
- diff --git a/lib/ovs-thread.c b/lib/ovs-thread.c
- index 6ebda07..b0e10ee 100644
- --- a/lib/ovs-thread.c
- +++ b/lib/ovs-thread.c
- @@ -340,6 +340,25 @@ ovsthread_wrapper(void *aux_)
- return aux.start(aux.arg);
- }
-
- +static void
- +set_min_stack_size(pthread_attr_t *attr, size_t min_stacksize)
- +{
- + size_t stacksize;
- + int error;
- +
- + error = pthread_attr_getstacksize(attr, &stacksize);
- + if (error) {
- + ovs_abort(error, "pthread_attr_getstacksize failed");
- + }
- +
- + if (stacksize < min_stacksize) {
- + error = pthread_attr_setstacksize(attr, min_stacksize);
- + if (error) {
- + ovs_abort(error, "pthread_attr_setstacksize failed");
- + }
- + }
- +}
- +
- /* Starts a thread that calls 'start(arg)'. Sets the thread's name to 'name'
- * (suffixed by its ovsthread_id()). Returns the new thread's pthread_t. */
- pthread_t
- @@ -358,10 +377,20 @@ ovs_thread_create(const char *name, void *(*start)(void *), void *arg)
- aux->arg = arg;
- ovs_strlcpy(aux->name, name, sizeof aux->name);
-
- + /* Some small systems use a default stack size as small as 80 kB, but OVS
- + * requires approximately 384 kB according to the following analysis:
- + * http://openvswitch.org/pipermail/dev/2016-January/065049.html
- + *
- + * We use 512 kB to give us some margin of error. */
- + pthread_attr_t attr;
- + pthread_attr_init(&attr);
- + set_min_stack_size(&attr, 512 * 1024);
- +
- error = pthread_create(&thread, NULL, ovsthread_wrapper, aux);
- if (error) {
- ovs_abort(error, "pthread_create failed");
- }
- + pthread_attr_destroy(&attr);
- return thread;
- }
-
- --
- 2.1.4
-
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