[kernel/f14] Avoid false quiescent states in rcutree with CONFIG_RCU_FAST_NO_HZ. (rhbz 577968)
Dave Jones
davej at fedoraproject.org
Mon Aug 22 14:36:42 UTC 2011
commit 83a9139012b03840e5acddc82375ffa3b88af1ba
Author: Dave Jones <davej at redhat.com>
Date: Mon Aug 22 10:36:20 2011 -0400
Avoid false quiescent states in rcutree with CONFIG_RCU_FAST_NO_HZ. (rhbz 577968)
kernel.spec | 3 +
rcutree-avoid-false-quiescent-states.patch | 810 ++++++++++++++++++++++++++++
2 files changed, 813 insertions(+), 0 deletions(-)
---
diff --git a/kernel.spec b/kernel.spec
index 4dbdf87..db49436 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -2179,6 +2179,9 @@ fi
# and build.
%changelog
+* Mon Aug 22 2011 Dave Jones <davej at redhat.com>
+- Avoid false quiescent states in rcutree with CONFIG_RCU_FAST_NO_HZ. (rhbz 577968)
+
* Mon Aug 15 2011 Chuck Ebbert <cebbert at redhat.com> 2.6.35.14-95
- CVE-2011-2905: perf tools: may parse user-controlled configuration file
- CVE-2011-2695: ext4: kernel panic when writing data to the last block of sparse file
diff --git a/rcutree-avoid-false-quiescent-states.patch b/rcutree-avoid-false-quiescent-states.patch
new file mode 100644
index 0000000..c8f8f20
--- /dev/null
+++ b/rcutree-avoid-false-quiescent-states.patch
@@ -0,0 +1,810 @@
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+ Attachment #519158: Patch to remove rcu_needs_cpu_flush() to avoid false quiescent states.
+ for <a href="show_bug.cgi?id=577968">bug #577968</a></p>
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+ | Return to <a href="show_bug.cgi?id=577968" title="ASSIGNED - kernel 2.6.34-0.16.rc2.git0.fc14.x86_64 gets GPF at cfq_free_io_context+0x18/0x34">bug 577968</a> |
+ Differences between
+ <form style="display: inline" action="attachment.cgi">
+ <select name="oldid">
+ <option value="519110" selected
+ >Diagnostic patch for RCU_FAST_NO_HZ assumptions</option>
+ <option value="500449"
+ >Fix frequent cgroup changed messages visible in debug logs</option>
+ <option value="499716"
+ >CFQ cic debug patch V2</option>
+ <option value="499426"
+ >CFQ cic debug patch</option>
+ </select>
+ and this patch
+ <input type="submit" id="diff" value="Diff">
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+<form name="checkboxform" action="attachment.cgi">
+<input type="checkbox" name="restore_indicator" style="display: none"><table class="file_table"><thead><tr><td class="num"></td><td></td><td class="num"></td><td></td></tr><tr><td class="file_head" colspan="4"><a href="#" onclick="return twisty_click(this)">(-)</a><input type="checkbox" name="a/kernel/rcutree.c" checked style="display: none">a/kernel/rcutree.c
+ (-3 lines)
+</td></tr></thead><tbody class="file">
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+</script>
+
+ <tr><th colspan="4" class="section_head">
+ <table cellpadding="0" cellspacing="0">
+ <tr><th width="95%" align="left">
+ Lines 1532-1540
+ static void rcu_process_callbacks(struct softirq_action *unused)
+ </th><th>
+ <a name="a/kernel/rcutree.c_sec1" href="#a/kernel/rcutree.c_sec1">Link Here</a>
+ </th></tr></table>
+ </th></tr>
+ <tr>
+ <td class="num">1532</td>
+ <td><pre> &__get_cpu_var(rcu_sched_data));</pre></td>
+ <td class="num">1532</td>
+ <td><pre> &__get_cpu_var(rcu_sched_data));</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1533</td>
+ <td><pre> __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));</pre></td>
+ <td class="num">1533</td>
+ <td><pre> __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1534</td>
+ <td><pre> rcu_preempt_process_callbacks();</pre></td>
+ <td class="num">1534</td>
+ <td><pre> rcu_preempt_process_callbacks();</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1535</td>
+ <td class="removed"><pre></pre></td>
+ <td class="num" rowspan="3"></td>
+ <td rowspan="3"></td>
+ </tr>
+ <tr>
+ <td class="num">1536</td>
+ <td class="removed"><pre> /* If we are last CPU on way to dyntick-idle mode, accelerate it. */</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1537</td>
+ <td class="removed"><pre> rcu_needs_cpu_flush();</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1538</td>
+ <td><pre> trace_rcu_utilization("End RCU core");</pre></td>
+ <td class="num">1535</td>
+ <td><pre> trace_rcu_utilization("End RCU core");</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1539</td>
+ <td><pre>}</pre></td>
+ <td class="num">1536</td>
+ <td><pre>}</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1540</td>
+ <td><pre></pre></td>
+ <td class="num">1537</td>
+ <td><pre></pre></td>
+ </tr>
+
+</table><table class="file_table"><thead><tr><td class="num"></td><td></td><td class="num"></td><td></td></tr><tr><td class="file_head" colspan="4"><a href="#" onclick="return twisty_click(this)">(-)</a><input type="checkbox" name="a/kernel/rcutree.h" checked style="display: none">a/kernel/rcutree.h
+ (-1 lines)
+</td></tr></thead><tbody class="file">
+<script type="text/javascript">
+incremental_restore()
+</script>
+
+ <tr><th colspan="4" class="section_head">
+ <table cellpadding="0" cellspacing="0">
+ <tr><th width="95%" align="left">
+ Lines 458-464
+ static int rcu_preempt_needs_cpu(int cpu);
+ </th><th>
+ <a name="a/kernel/rcutree.h_sec1" href="#a/kernel/rcutree.h_sec1">Link Here</a>
+ </th></tr></table>
+ </th></tr>
+ <tr>
+ <td class="num">458</td>
+ <td><pre>static void __cpuinit rcu_preempt_init_percpu_data(int cpu);</pre></td>
+ <td class="num">458</td>
+ <td><pre>static void __cpuinit rcu_preempt_init_percpu_data(int cpu);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">459</td>
+ <td><pre>static void rcu_preempt_send_cbs_to_online(void);</pre></td>
+ <td class="num">459</td>
+ <td><pre>static void rcu_preempt_send_cbs_to_online(void);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">460</td>
+ <td><pre>static void __init __rcu_init_preempt(void);</pre></td>
+ <td class="num">460</td>
+ <td><pre>static void __init __rcu_init_preempt(void);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">461</td>
+ <td class="removed"><pre>static void rcu_needs_cpu_flush(void);</pre></td>
+ <td class="num"></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td class="num">462</td>
+ <td><pre>static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);</pre></td>
+ <td class="num">461</td>
+ <td><pre>static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">463</td>
+ <td><pre>static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);</pre></td>
+ <td class="num">462</td>
+ <td><pre>static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">464</td>
+ <td><pre>static void invoke_rcu_callbacks_kthread(void);</pre></td>
+ <td class="num">463</td>
+ <td><pre>static void invoke_rcu_callbacks_kthread(void);</pre></td>
+ </tr>
+
+</table><table class="file_table"><thead><tr><td class="num"></td><td></td><td class="num"></td><td></td></tr><tr><td class="file_head" colspan="4"><a href="#" onclick="return twisty_click(this)">(-)</a><input type="checkbox" name="a/kernel/rcutree_plugin.h" checked style="display: none">a/kernel/rcutree_plugin.h
+ (-25 lines)
+</td></tr></thead><tbody class="file">
+<script type="text/javascript">
+incremental_restore()
+</script>
+
+ <tr><th colspan="4" class="section_head">
+ <table cellpadding="0" cellspacing="0">
+ <tr><th width="95%" align="left">
+ Lines 1954-1968
+ int rcu_needs_cpu(int cpu)
+ </th><th>
+ <a name="a/kernel/rcutree_plugin.h_sec1" href="#a/kernel/rcutree_plugin.h_sec1">Link Here</a>
+ </th></tr></table>
+ </th></tr>
+ <tr>
+ <td class="num">1954</td>
+ <td><pre> return rcu_needs_cpu_quick_check(cpu);</pre></td>
+ <td class="num">1954</td>
+ <td><pre> return rcu_needs_cpu_quick_check(cpu);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1955</td>
+ <td><pre>}</pre></td>
+ <td class="num">1955</td>
+ <td><pre>}</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1956</td>
+ <td><pre></pre></td>
+ <td class="num">1956</td>
+ <td><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">1957</td>
+ <td class="removed"><pre>/*</pre></td>
+ <td class="num" rowspan="9"></td>
+ <td rowspan="9"></td>
+ </tr>
+ <tr>
+ <td class="num">1958</td>
+ <td class="removed"><pre> * Check to see if we need to continue a callback-flush operations to</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1959</td>
+ <td class="removed"><pre> * allow the last CPU to enter dyntick-idle mode. But fast dyntick-idle</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1960</td>
+ <td class="removed"><pre> * entry is not configured, so we never do need to.</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1961</td>
+ <td class="removed"><pre> */</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1962</td>
+ <td class="removed"><pre>static void rcu_needs_cpu_flush(void)</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1963</td>
+ <td class="removed"><pre>{</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1964</td>
+ <td class="removed"><pre>}</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1965</td>
+ <td class="removed"><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">1966</td>
+ <td><pre>#else /* #if !defined(CONFIG_RCU_FAST_NO_HZ) */</pre></td>
+ <td class="num">1957</td>
+ <td><pre>#else /* #if !defined(CONFIG_RCU_FAST_NO_HZ) */</pre></td>
+ </tr>
+ <tr>
+ <td class="num">1967</td>
+ <td><pre></pre></td>
+ <td class="num">1958</td>
+ <td><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">1968</td>
+ <td><pre>#define RCU_NEEDS_CPU_FLUSHES 5</pre></td>
+ <td class="num">1959</td>
+ <td><pre>#define RCU_NEEDS_CPU_FLUSHES 5</pre></td>
+ </tr>
+ <tr><th colspan="4" class="section_head">
+ <table cellpadding="0" cellspacing="0">
+ <tr><th width="95%" align="left">
+ Lines 2039-2058
+ int rcu_needs_cpu(int cpu)
+ </th><th>
+ <a name="a/kernel/rcutree_plugin.h_sec2" href="#a/kernel/rcutree_plugin.h_sec2">Link Here</a>
+ </th></tr></table>
+ </th></tr>
+ <tr>
+ <td class="num">2039</td>
+ <td><pre> return c;</pre></td>
+ <td class="num">2030</td>
+ <td><pre> return c;</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2040</td>
+ <td><pre>}</pre></td>
+ <td class="num">2031</td>
+ <td><pre>}</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2041</td>
+ <td><pre></pre></td>
+ <td class="num">2032</td>
+ <td><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">2042</td>
+ <td class="removed"><pre>/*</pre></td>
+ <td class="num" rowspan="16"></td>
+ <td rowspan="16"></td>
+ </tr>
+ <tr>
+ <td class="num">2043</td>
+ <td class="removed"><pre> * Check to see if we need to continue a callback-flush operations to</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2044</td>
+ <td class="removed"><pre> * allow the last CPU to enter dyntick-idle mode.</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2045</td>
+ <td class="removed"><pre> */</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2046</td>
+ <td class="removed"><pre>static void rcu_needs_cpu_flush(void)</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2047</td>
+ <td class="removed"><pre>{</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2048</td>
+ <td class="removed"><pre> int cpu = smp_processor_id();</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2049</td>
+ <td class="removed"><pre> unsigned long flags;</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2050</td>
+ <td class="removed"><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">2051</td>
+ <td class="removed"><pre> if (per_cpu(rcu_dyntick_drain, cpu) <= 0)</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2052</td>
+ <td class="removed"><pre> return;</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2053</td>
+ <td class="removed"><pre> local_irq_save(flags);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2054</td>
+ <td class="removed"><pre> (void)rcu_needs_cpu(cpu);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2055</td>
+ <td class="removed"><pre> local_irq_restore(flags);</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2056</td>
+ <td class="removed"><pre>}</pre></td>
+ </tr>
+ <tr>
+ <td class="num">2057</td>
+ <td class="removed"><pre></pre></td>
+ </tr>
+ <tr>
+ <td class="num">2058</td>
+ <td><pre>#endif /* #else #if !defined(CONFIG_RCU_FAST_NO_HZ) */</pre></td>
+ <td class="num">2033</td>
+ <td><pre>#endif /* #else #if !defined(CONFIG_RCU_FAST_NO_HZ) */</pre></td>
+ </tr>
+
+</table></form>
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