Messages in this thread Patch in this message | | | Date | Sat, 16 Jun 2001 18:06:48 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: spindown [was Re: 2.4.6-pre2, pre3 VM Behavior] |
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On Sat, 16 Jun 2001, Daniel Phillips wrote:
> In other words, any episode of pageouts is followed immediately by a > short episode of preemptive cleaning.
linux/mm/vmscan.c::page_launder(), around line 666: /* Let bdflush take care of the rest. */ wakeup_bdflush(0);
> The definition of 'for a while' and 'plenty of disk bandwidth' can be > tuned, but I don't think either is particularly critical.
Can be tuned a bit, indeed.
> As a side note, the good old multisecond delay before bdflush kicks in > doesn't really make a lot of sense - when bandwidth is available the > filesystem-initiated writeouts should happen right away.
... thus spinning up the disk ?
How about just making sure we write out a bigger bunch of dirty pages whenever one buffer gets too old ?
Does the patch below do anything good for your laptop? ;)
regards,
Rik --
--- buffer.c.orig Sat Jun 16 18:05:15 2001 +++ buffer.c Sat Jun 16 18:05:29 2001 @@ -2550,8 +2550,7 @@ if the current bh is not yet timed out, then also all the following bhs will be too young. */ - if (++flushed > bdf_prm.b_un.ndirty && - time_before(jiffies, bh->b_flushtime)) + if(time_before(jiffies, bh->b_flushtime)) goto out_unlock; } else { if (++flushed > bdf_prm.b_un.ndirty) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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