Messages in this thread | | | Date | Wed, 7 Jan 2004 12:50:40 -0600 | From | Matt Mackall <> | Subject | Re: 2.6.1-rc1-tiny2 |
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On Wed, Jan 07, 2004 at 03:06:40PM +0100, Jens Axboe wrote: > On Mon, Jan 05 2004, Matt Mackall wrote: > > This is the fourth release of the -tiny kernel tree. The aim of this > > tree is to collect patches that reduce kernel disk and memory > > footprint as well as tools for working on small systems. Target users > > are things like embedded systems, small or legacy desktop folks, and > > handhelds. > > > > Latest release includes: > > - various compile fixes for last release > > - actually include Andi Kleen's bloat-o-meter this time > > - optional mempool removal > > Your CONFIG_MEMPOOL is completely broken as you are no longer giving the > same guarentees (you have no reserve at all). Might as well change it to > CONFIG_DEADLOCK instead.
It's equivalent to a pool size of zero, yes, so deadlock odds are significantly higher with some usage scenarios. I'll add a big fat warning.
On the other hand, the existence of pre-allocated mempools can greatly increase the likelihood of starvation, oom, and deadlock on the rest of the system, especially as it becomes a greater percentage of the total free memory on a small system. In other words, I had to cut this corner to make running in 2M work with my config. When I merge CONFIG_BLOCK, it'll be more generally useful.
For the sake of our other readers, I'll point out that mempool doesn't intrinisically reduce deadlock odds to zero unless we have a hard limit on requests in flight that's strictly less than pool size.
-- Matt Mackall : http://www.selenic.com : Linux development and consulting - 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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