fix previous rcu diff. (broken commit)
This commit is contained in:
Dave Jones
parent
83a9139012
commit
b5c25fa75f
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@ -735,6 +735,8 @@ Patch2950: linux-2.6-via-velocity-dma-fix.patch
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Patch3010: linux-2.6-rcu-netpoll.patch
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Patch4000: rcutree-avoid-false-quiescent-states.patch
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# NFSv4
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# patches headed upstream
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@ -1483,6 +1485,8 @@ ApplyPatch linux-2.6-via-velocity-dma-fix.patch
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# silence another rcu_reference warning
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ApplyPatch linux-2.6-rcu-netpoll.patch
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ApplyPatch rcutree-avoid-false-quiescent-states.patch
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# Patches headed upstream
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ApplyPatch disable-i8042-check-on-apple-mac.patch
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<p>Red Hat Bugzilla –
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Attachment #519158: Patch to remove rcu_needs_cpu_flush() to avoid false quiescent states.
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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> |
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Differences between
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<form style="display: inline" action="attachment.cgi">
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<select name="oldid">
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<option value="519110" selected
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>Diagnostic patch for RCU_FAST_NO_HZ assumptions</option>
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<option value="500449"
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>Fix frequent cgroup changed messages visible in debug logs</option>
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<option value="499716"
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>CFQ cic debug patch V2</option>
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<option value="499426"
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>CFQ cic debug patch</option>
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</select>
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and this patch
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<br><br>
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--- linux-2.6.35.noarch/kernel/rcutree.c~ 2011-08-22 10:46:35.518079924 -0400
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+++ linux-2.6.35.noarch/kernel/rcutree.c 2011-08-22 10:46:47.151040660 -0400
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@@ -1376,9 +1376,6 @@ static void rcu_process_callbacks(struct
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* grace-period manipulations above.
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*/
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smp_mb(); /* See above block comment. */
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-
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- /* If we are last CPU on way to dyntick-idle mode, accelerate it. */
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- rcu_needs_cpu_flush();
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}
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<form name="checkboxform" action="attachment.cgi">
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<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
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(-3 lines)
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incremental_restore()
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<table cellpadding="0" cellspacing="0">
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<tr><th width="95%" align="left">
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Lines 1532-1540
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static void rcu_process_callbacks(struct softirq_action *unused)
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</th><th>
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<a name="a/kernel/rcutree.c_sec1" href="#a/kernel/rcutree.c_sec1">Link Here</a>
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</th></tr></table>
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</th></tr>
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<tr>
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<td class="num">1532</td>
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<td><pre> &__get_cpu_var(rcu_sched_data));</pre></td>
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<td class="num">1532</td>
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<td><pre> &__get_cpu_var(rcu_sched_data));</pre></td>
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</tr>
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<tr>
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<td class="num">1533</td>
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<td><pre> __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));</pre></td>
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<td class="num">1533</td>
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<td><pre> __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));</pre></td>
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</tr>
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<tr>
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<td class="num">1534</td>
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<td><pre> rcu_preempt_process_callbacks();</pre></td>
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<td class="num">1534</td>
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<td><pre> rcu_preempt_process_callbacks();</pre></td>
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</tr>
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<tr>
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<td class="num">1535</td>
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<td class="removed"><pre></pre></td>
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<td class="num" rowspan="3"></td>
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<td rowspan="3"></td>
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</tr>
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<tr>
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<td class="num">1536</td>
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<td class="removed"><pre> /* If we are last CPU on way to dyntick-idle mode, accelerate it. */</pre></td>
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</tr>
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<tr>
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<td class="num">1537</td>
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<td class="removed"><pre> rcu_needs_cpu_flush();</pre></td>
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</tr>
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<tr>
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<td class="num">1538</td>
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<td><pre> trace_rcu_utilization("End RCU core");</pre></td>
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<td class="num">1535</td>
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<td><pre> trace_rcu_utilization("End RCU core");</pre></td>
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</tr>
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<tr>
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<td class="num">1539</td>
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<td><pre>}</pre></td>
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<td class="num">1536</td>
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<td><pre>}</pre></td>
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</tr>
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<tr>
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<td class="num">1540</td>
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<td><pre></pre></td>
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<td class="num">1537</td>
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<td><pre></pre></td>
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</tr>
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</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
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Lines 458-464
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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>
|
||||
|
||||
|
||||
<br>
|
||||
|
||||
<span>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></span>
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|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://engstats.redhat.com/piwik/" : "http://engstats.redhat.com/piwik/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
try {
|
||||
var piwikTracker = Piwik.getTracker(pkBaseURL + "piwik.php", 2);
|
||||
piwikTracker.setCustomVariable(1, "bz_user", "davej\x40redhat.com");
|
||||
piwikTracker.trackPageView();
|
||||
piwikTracker.enableLinkTracking();
|
||||
} catch( err ) {}
|
||||
</script><noscript><p><img src="http://engstats.redhat.com/piwik/piwik.php?idsite=2" style="border:0" alt="" /></p></noscript>
|
||||
<!-- End Piwik Tracking Code -->
|
||||
|
||||
</body>
|
||||
</html>
|
||||
static void
|
||||
--- linux-2.6.35.noarch/kernel/rcutree.h~ 2011-08-22 10:48:36.063675727 -0400
|
||||
+++ linux-2.6.35.noarch/kernel/rcutree.h 2011-08-22 10:48:43.639650514 -0400
|
||||
@@ -384,6 +384,5 @@ static int rcu_preempt_needs_cpu(int cpu
|
||||
static void __cpuinit rcu_preempt_init_percpu_data(int cpu);
|
||||
static void rcu_preempt_send_cbs_to_orphanage(void);
|
||||
static void __init __rcu_init_preempt(void);
|
||||
-static void rcu_needs_cpu_flush(void);
|
||||
|
||||
#endif /* #ifndef RCU_TREE_NONCORE */
|
||||
--- a/kernel/rcutree_plugin.h
|
||||
+++ a/kernel/rcutree_plugin.h
|
||||
@@ -1954,15 +1954,6 @@ int rcu_needs_cpu(int cpu)
|
||||
return rcu_needs_cpu_quick_check(cpu);
|
||||
}
|
||||
|
||||
-/*
|
||||
- * Check to see if we need to continue a callback-flush operations to
|
||||
- * allow the last CPU to enter dyntick-idle mode. But fast dyntick-idle
|
||||
- * entry is not configured, so we never do need to.
|
||||
- */
|
||||
-static void rcu_needs_cpu_flush(void)
|
||||
-{
|
||||
-}
|
||||
-
|
||||
#else /* #if !defined(CONFIG_RCU_FAST_NO_HZ) */
|
||||
|
||||
#define RCU_NEEDS_CPU_FLUSHES 5
|
||||
@@ -2039,20 +2030,4 @@ int rcu_needs_cpu(int cpu)
|
||||
return c;
|
||||
}
|
||||
|
||||
-/*
|
||||
- * Check to see if we need to continue a callback-flush operations to
|
||||
- * allow the last CPU to enter dyntick-idle mode.
|
||||
- */
|
||||
-static void rcu_needs_cpu_flush(void)
|
||||
-{
|
||||
- int cpu = smp_processor_id();
|
||||
- unsigned long flags;
|
||||
-
|
||||
- if (per_cpu(rcu_dyntick_drain, cpu) <= 0)
|
||||
- return;
|
||||
- local_irq_save(flags);
|
||||
- (void)rcu_needs_cpu(cpu);
|
||||
- local_irq_restore(flags);
|
||||
-}
|
||||
-
|
||||
#endif /* #else #if !defined(CONFIG_RCU_FAST_NO_HZ) */
|
||||
|
|
|
|||
Loading…
Reference in New Issue