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