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Message-ID: <849662.25086.qm@web32602.mail.mud.yahoo.com> Date: Tue, 16 Sep 2008 06:09:08 -0700 (PDT) From: Martin Knoblauch <knobi@...bisoft.de> To: linux-kernel@...r.kernel.org Cc: Peter zijlstra <a.p.zijlstra@...llo.nl>, Fengguang Wu <wfg@...l.ustc.edu.cn> Subject: How to find out, what "pdflush" is working on Hi, I find the following comment in mm/pdflush.c /* * The pdflush threads are worker threads for writing back dirty data. * Ideally, we'd like one thread per active disk spindle. But the disk * topology is very hard to divine at this level. Instead, we take * care in various places to prevent more than one pdflush thread from * performing writeback against a single filesystem. pdflush threads * have the PF_FLUSHER flag set in current->flags to aid in this. */ Is there a way to find out what a certain instance of "pdflush" is working on? Like which block-device or which fliesystem it is writing to? I am still (2.6.27) trying to track down why writing a single file can make linux very sluggish and unresponsive. If that happens I usually see all possible 8 "pdflush" threads being in "D"-state. According to above comment only one of them should be really busy. Cheers Martin ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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