From: "Iram Shahzad" <iram.shahzad@jp.fujitsu.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-mm@kvack.org
Subject: compaction: trying to understand the code
Date: Tue, 17 Aug 2010 20:08:54 +0900 [thread overview]
Message-ID: <325E0A25FE724BA18190186F058FF37E@rainbow> (raw)
Hi
I am trying to understand the following code in isolate_migratepages
function. I have a question regarding this.
---
while (unlikely(too_many_isolated(zone))) {
congestion_wait(BLK_RW_ASYNC, HZ/10);
if (fatal_signal_pending(current))
return 0;
}
---
I have seen that in some cases this while loop never exits
because too_many_isolated keeps returning true for ever.
And hence the process hangs. Is this intended behaviour?
What is it that is supposed to change the "too_many_isolated" situation?
In other words, what is it that is supposed to increase the "inactive"
or decrease the "isolated" so that isolated > inactive becomes false?
Best regards
Iram
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next reply other threads:[~2010-08-17 11:04 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 11:08 Iram Shahzad [this message]
2010-08-17 11:10 ` Mel Gorman
2010-08-18 8:19 ` Iram Shahzad
2010-08-18 15:41 ` Wu Fengguang
2010-08-19 7:09 ` Iram Shahzad
2010-08-19 7:45 ` Wu Fengguang
2010-08-19 7:46 ` Mel Gorman
2010-08-19 8:08 ` Wu Fengguang
2010-08-19 8:15 ` Mel Gorman
2010-08-19 8:29 ` Wu Fengguang
2010-08-20 5:45 ` Iram Shahzad
2010-08-20 5:50 ` Wu Fengguang
2010-08-20 6:13 ` Iram Shahzad
2010-08-19 16:00 ` Minchan Kim
2010-08-20 5:31 ` Iram Shahzad
2010-08-20 5:34 ` Wu Fengguang
2010-08-20 9:35 ` Mel Gorman
2010-08-20 10:22 ` Minchan Kim
2010-08-22 15:31 ` Minchan Kim
2010-08-22 23:23 ` Wu Fengguang
2010-08-23 1:58 ` Minchan Kim
2010-08-23 3:03 ` Iram Shahzad
2010-08-23 9:10 ` Minchan Kim
2010-08-26 8:51 ` Mel Gorman
2010-08-23 7:18 ` Mel Gorman
2010-08-23 17:14 ` Minchan Kim
2010-08-24 0:27 ` Wu Fengguang
2010-08-24 5:07 ` Iram Shahzad
2010-08-24 6:52 ` Minchan Kim
2010-08-26 8:05 ` Iram Shahzad
2010-08-23 7:16 ` Mel Gorman
2010-08-23 9:07 ` Minchan Kim
2010-08-20 10:23 ` Wu Fengguang
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