Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Christoph Lameter <[email protected]> writes:

> Reclaim can be called with interrupts disabled in atomic reclaim.
> vmscan.c is currently using spinlock_irq(). Switch to spin_lock_irqsave().

I like the idea in principle. If this fully works out we could
potentially keep less memory free by default which would be a good
thing in general: free memory is bad memory.

But would be interesting to measure what the lock
changes do to interrupt latency. Probably nothing good.

A more benign alternative might be to just set a per CPU flag during
these critical sections and then only do atomic reclaim on a local
interrupt when the flag is not set.  That would make it a little less
reliable, but much less intrusive and with some luck still give many
of the benefits.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux