Messages in this thread | | | From | Luis Henriques <> | Subject | Re: [PATCH 2/2] percpu: fix iteration to prevent skipping over block | Date | Thu, 28 Sep 2017 09:31:00 +0100 |
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Tejun Heo <tj@kernel.org> writes:
> On Wed, Sep 27, 2017 at 04:35:00PM -0500, Dennis Zhou wrote: >> The iterator functions pcpu_next_md_free_region and >> pcpu_next_fit_region use the block offset to determine if they have >> checked the area in the prior iteration. However, this causes an issue >> when the block offset is greater than subsequent block contig hints. If >> within the iterator it moves to check subsequent blocks, it may fail in >> the second predicate due to the block offset not being cleared. Thus, >> this causes the allocator to skip over blocks leading to false failures >> when allocating from the reserved chunk. While this happens in the >> general case as well, it will only fail if it cannot allocate a new >> chunk. >> >> This patch resets the block offset to 0 to pass the second predicate >> when checking subseqent blocks within the iterator function. >> >> Signed-off-by: Dennis Zhou <dennisszhou@gmail.com> >> Reported-by: Luis Henriques <lhenriques@suse.com> > > Luis, can you please verify that this fixes the allocaiton failure you > were seeing?
I can confirm that I'm no longer seeing the allocation failure after applying these patches. Feel free to add my:
Tested-by: Luis Henriques <lhenriques@suse.com>
Cheers, -- Luis
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