Messages in this thread | | | Date | Thu, 6 Mar 2014 15:47:26 -0500 | From | Tejun Heo <> | Subject | Re: [PATCH 1/5][RFC][CFT] percpu fixes, part 1 |
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Hello, Al.
On Thu, Mar 06, 2014 at 08:30:30PM +0000, Al Viro wrote: > > Also, I think it'd be better to split addition of first_free hint to a > > separate patch. > > OK, but I'm not sure how much does it simplify things, actually.
Not much, but it should at least help bisection if something goes wrong, I think.
> > A comment explaining why ignoring the free bit during bin search is > > okay would be nice? > > Huh? We are not ignoring it - we are searching for exact value, including > the lower bit being set. It might be worth adding a comment next to > "freeme |= 1;" before the loop, but that's it. These two BUG_ON() fold
Oh yeah, nothing too much. I was just thinking about noting that looking for the exact match is enough as we're looking for the matching busy slot and the bit itself can't change ordering between entries.
> > > + if (unlikely(align < 2)) > > > + align = 2; > > > > Please add a comment explaining why the above min alignment is > > necessary. > > Umm... Will "we want the lowest bit of offset available for free/in_use > indicator" do?
Yeap.
Thanks!
-- tejun
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