svn commit: r218221 - head/sys/x86/x86

[John Baldwin]

Author: jhb
Date: Thu Feb  3 13:09:22 2011
New Revision: 218221
URL: http://svn.freebsd.org/changeset/base/218221

Log:
  Use a dedicated taskqueue with a thread that runs at a software-interrupt
  priority for the periodic polling of the machine check registers.

Modified:
  head/sys/x86/x86/mca.c

Modified: head/sys/x86/x86/mca.c
==============================================================================
--- head/sys/x86/x86/mca.c      Thu Feb  3 12:19:07 2011        (r218220)
+++ head/sys/x86/x86/mca.c      Thu Feb  3 13:09:22 2011        (r218221)
@@ -105,6 +105,7 @@ SYSCTL_INT(_hw_mca, OID_AUTO, erratum383
 static STAILQ_HEAD(, mca_internal) mca_records;
 static struct callout mca_timer;
 static int mca_ticks = 3600;   /* Check hourly by default. */
+static struct taskqueue *mca_tq;
 static struct task mca_task;
 static struct mtx mca_lock;
 
@@ -606,7 +607,7 @@ static void
 mca_periodic_scan(void *arg)
 {
 
-       taskqueue_enqueue(taskqueue_thread, &mca_task);
+       taskqueue_enqueue(mca_tq, &mca_task);
        callout_reset(&mca_timer, mca_ticks * hz, mca_periodic_scan, NULL);
 }
 
@@ -620,7 +621,7 @@ sysctl_mca_scan(SYSCTL_HANDLER_ARGS)
        if (error)
                return (error);
        if (i)
-               taskqueue_enqueue(taskqueue_thread, &mca_task);
+               taskqueue_enqueue(mca_tq, &mca_task);
        return (0);
 }
 
@@ -631,6 +632,9 @@ mca_startup(void *dummy)
        if (!mca_enabled || !(cpu_feature & CPUID_MCA))
                return;
 
+       mca_tq = taskqueue_create("mca", M_WAITOK, taskqueue_thread_enqueue,
+           &mca_tq);
+       taskqueue_start_threads(&mca_tq, 1, PI_SWI(SWI_TQ), "mca taskq");
        callout_reset(&mca_timer, mca_ticks * hz, mca_periodic_scan,
                    NULL);
 }
@@ -670,7 +674,7 @@ mca_setup(uint64_t mcg_cap)
 
        mtx_init(&mca_lock, "mca", NULL, MTX_SPIN);
        STAILQ_INIT(&mca_records);
-       TASK_INIT(&mca_task, 0x8000, mca_scan_cpus, NULL);
+       TASK_INIT(&mca_task, 0, mca_scan_cpus, NULL);
        callout_init(&mca_timer, CALLOUT_MPSAFE);
        SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_mca), OID_AUTO,
            "count", CTLFLAG_RD, &mca_count, 0, "Record count");
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