kswapd continuously active

From: Jan Engelhardt
Date: Fri Jan 22 2010 - 18:52:19 EST


with on sparc64 I am seeing that there is a sync(1) process
busy in D state, with the following trace:

sync D 000000000079299c 7552 4851 1 0x208061101000004
Call Trace:
[000000000053ca58] bdi_sched_wait+0xc/0x1c
[000000000079299c] __wait_on_bit+0x58/0xb8
[0000000000792a5c] out_of_line_wait_on_bit+0x60/0x74
[000000000053ca3c] bdi_sync_writeback+0x6c/0x7c
[000000000053ca78] sync_inodes_sb+0x10/0xfc
[0000000000540dd0] __sync_filesystem+0x50/0x88
[0000000000540ec8] sync_filesystems+0xc0/0x124
[0000000000540f80] sys_sync+0x1c/0x48
[0000000000406294] linux_sparc_syscall+0x34/0x44

kswapd is also active all the time, writing something to disk - LED is
blinking, and that's been going on for over half an hour despite the box
being not busy. How do I see what kswapd is still flushing to disk? Even
if all RAM (8 GB) was filled with dirty data, syncing it out would not
take that long - that is to say, the sync process should have long
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/