<div dir="ltr"><div>I have known more request_timer_fn(). Thanks</div><div><br></div><div><div>I think helper function <b style="color:rgb(0,0,0);font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;font-size:14px;line-height:20px;white-space:nowrap">time_min_in_future() </b>function will return the nearest future time, right?</div><div>And, next_trigger_time is initialize now value, so always is same.</div><div><div id="main-content" class="" style="margin:0px;padding:0px;font-size:12px;color:rgb(51,51,51);font-family:Helvetica,'\00b9d1\00c740 \00ace0\00b515',Verdana,serif;line-height:17.1429px"><div class="" style="margin:10px 0px;padding:0px;border:1px solid rgb(204,204,204);overflow:auto;border-radius:3px"><div class="" style="margin:0px;padding:0px;font-size:14px;line-height:20px;overflow:hidden;border-bottom-left-radius:3px;border-bottom-right-radius:3px;background-image:initial;background-repeat:initial"><div style="margin:0px;padding:0px"><div id="highlighter_381323" class="" style="margin:0px;padding:0px;width:1387px;overflow:auto;font-size:1em"><table border="0" cellpadding="0" cellspacing="0" style="border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:1387px;font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;min-height:inherit;background:0px 50%"><tbody style="border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"><tr style="border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"><td class="" style="border:0px;overflow:visible;border-radius:0px;float:none;height:auto;outline:0px;padding:0px 0px 0px 15px;vertical-align:baseline;width:1372px;font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;min-height:inherit;background:0px 50%"><div class="" title="Hint: double-click to select code" style="margin:15px 0px 0px;padding:0px 0px 15px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:pre-wrap;background:0px 50%"><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">void</code> <code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">request_timer_fn(unsigned </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">long</code> <code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">data)</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">{</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">if</code> <code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">(dt) {</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">if</code> <code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">(device->disk_state[NOW] > D_FAILED) {</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">next_trigger_time = <b>time_min_in_future</b>(now,</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">next_trigger_time, oldest_submit_jif + dt); </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:rgb(0,130,0)!important;background:0px 50%">// 1st assign</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">restart_timer = </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">true</code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">;</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">}</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">}</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">for_each_connection(connection, device->resource) {</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">next_trigger_time = <b>time_min_in_future</b>(now,</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">next_trigger_time, pre_send_jif + ent); </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:rgb(0,130,0)!important;background:0px 50%">// 2nd assign</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">}</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;font-weight:bold!important;color:rgb(0,102,153)!important;background:0px 50%">if</code> <code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">(restart_timer) {</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">next_trigger_time = <b>time_min_in_future</b>(now, next_trigger_time, now + et); </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:rgb(0,130,0)!important;background:0px 50%">// 3rd assign</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">...</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;background:0px 50%"> </code><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">}</code></div><div class="" style="margin:0px;padding:0px 1em 0px 0px;border-radius:0px;border:0px;float:none;height:auto;outline:0px;overflow:visible;vertical-align:baseline;width:auto;min-height:inherit;white-space:nowrap;background-image:initial;background-repeat:initial"><code class="" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;border-radius:0px;border:0px;float:none;height:auto;margin:0px;outline:0px;overflow:visible;padding:0px;vertical-align:baseline;width:auto;min-height:inherit;color:black!important;background:0px 50%">}</code></div></div></td></tr></tbody></table></div></div></div></div></div><div id="likes-and-labels-container" style="margin:10px 0px;padding:10px 0px;overflow:hidden;clear:both;color:rgb(51,51,51);font-family:Helvetica,'\00b9d1\00c740 \00ace0\00b515',Verdana,serif;font-size:12px;line-height:17.1429px">Maybe, 3 assignments are always same, because now == next_trigger_time, which is the nearest. <br>So, if <span style="color:rgb(0,0,0);font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace;font-size:14px;line-height:20px;white-space:nowrap">restart_timer</span> 's value is true, then loop continuously even dt or ent exists.</div></div></div><div id="likes-and-labels-container" style="margin:10px 0px;padding:10px 0px;overflow:hidden;clear:both;color:rgb(51,51,51);font-family:Helvetica,'\00b9d1\00c740 \00ace0\00b515',Verdana,serif;font-size:12px;line-height:17.1429px">I don't know how to put the different thing.<br><br>Thanks.</div><div id="likes-and-labels-container" style="margin:10px 0px;padding:10px 0px;overflow:hidden;clear:both;color:rgb(51,51,51);font-family:Helvetica,'\00b9d1\00c740 \00ace0\00b515',Verdana,serif;font-size:12px;line-height:17.1429px"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-03-11 20:00 GMT+09:00 <span dir="ltr"><<a href="mailto:drbd-dev-request@lists.linbit.com" target="_blank">drbd-dev-request@lists.linbit.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send drbd-dev mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: request_timer continuous loop if there is disk-timeout<br>
(Lars Ellenberg)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Fri, 11 Mar 2016 11:02:35 +0100<br>
From: Lars Ellenberg <<a href="mailto:lars.ellenberg@linbit.com">lars.ellenberg@linbit.com</a>><br>
Subject: Re: [Drbd-dev] request_timer continuous loop if there is<br>
disk-timeout<br>
To: <a href="mailto:drbd-dev@lists.linbit.com">drbd-dev@lists.linbit.com</a><br>
Message-ID: <20160311100235.GD17669@soda.linbit><br>
Content-Type: text/plain; charset=utf-8<br>
<br>
On Fri, Mar 11, 2016 at 04:30:27PM +0900, ??? wrote:<br>
> Hello.<br>
> I'm a software engineer in Mantech.<br>
><br>
> In testing about disk-timeout property,<br>
> if not default value, which will lead into a continuous loop.<br>
><br>
> in request_timer_fn()<br>
> ...<br>
> if (device->disk_state[NOW] > D_FAILED) {<br>
> et = min_not_zero(et, dt);<br>
> next_trigger_time = time_min_in_future(now,<br>
> next_trigger_time, oldest_submit_jif + dt);<br>
> restart_timer = true;<br>
> }<br>
> ...<br>
> I think, if there is no request, next_trigger_time should be calculated<br>
> below<br>
> next_trigger_time = time_min_in_future(now,<br>
> next_trigger_time + *dt*, oldest_submit_jif + dt);<br>
><br>
> However, I can't be sure.<br>
<br>
"dt" : disk timeout<br>
"et" : effective timeout<br>
"ent" : effective network timeout<br>
"now" : well, now.<br>
"next_trigger_time" : when to trigger the next timer<br>
<br>
next_trigger_time is initialized to "now".<br>
<br>
it gets adjusted using "time_min_in_future()",<br>
which is this helper:<br>
static unsigned long time_min_in_future(unsigned long now,<br>
unsigned long t1, unsigned long t2)<br>
{<br>
t1 = time_after(now, t1) ? now : t1;<br>
t2 = time_after(now, t2) ? now : t2;<br>
return time_after(t1, t2) ? t2 : t1;<br>
}<br>
<br>
time_after is ((long)((b) - (a)) < 0)), NOT <=.<br>
<br>
next_trigger_time will become larger than now,<br>
or stay at its initial value, which is now.<br>
<br>
function ends with<br>
<br>
if (restart_timer) {<br>
next_trigger_time = time_min_in_future(now, next_trigger_time, now + et);<br>
mod_timer(&device->request_timer, next_trigger_time);<br>
}<br>
<br>
so in case next_trigger_time will still be equal to now at the end of the<br>
function, it will be set to "now + et" before it is passed to mod_timer.<br>
<br>
et can only be zero if both network and disk timeout where zero,<br>
in which case the whole thing would not even be used,<br>
because that would mean timeouts are disabled.<br>
<br>
<br>
Besides that,<br>
I would be surprised if disk timeout in 9 worked properly yet.<br>
<br>
Also, disk timeout is evil in any case, and NOT TO BE USED<br>
(not even in 8.4, where it *does* work properly ("as designed"), afaik)<br>
<br>
Why? Because if it triggers, and the IO subsystem ("disk") decides to<br>
still process the submitted request some time later,<br>
you'd get stuff RDMA'd to some random memory page which may well be meanwhile<br>
re-used for unrelated things. In which case we intentionally panic().<br>
<br>
But you knew that already.<br>
<br>
--<br>
: Lars Ellenberg<br>
: LINBIT | Keeping the Digital World Running<br>
: DRBD -- Heartbeat -- Corosync -- Pacemaker<br>
: R&D, Integration, Ops, Consulting, Support<br>
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End of drbd-dev Digest, Vol 133, Issue 7<br>
****************************************<br>
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