Re: [RFC PATCH v1.2 2/8] mm/damon/paddr: respect folio end for DAMOS_STAT

[sashiko-bot@kernel.org]

> The function for applying DAMOS_STAT in DAMON physical address space
> operation set (paddr), namely damon_pa_stat(), applies DAMOS filters to
> folios of the given region.  For that, it gets folios of addresses in
> the region.  It starts from the region start address and advances the
> address by the size of the folio of the address until it goes out of the
> region.  If the start address is in the middle of a large folio, and if
> the next folios are small, some of the next folios could be skipped. Fix
> the issue by advancing the address to exactly the start address of the
> next folio.
> 
> The user impact is that the DAMOS_STAT-based page level monitoring
> results become inaccurate.  Since the page level monitoring is supposed
> to provide relatively high precision, this is definitely a problem.  It
> is arguably not critical since it is only monitoring quality
> degradation.
> 
> Fixes: bdbe1d7bc325 ("mm/damon/paddr: increment pa_stat damon address range by folio size")
> Cc: <stable@vger.kernel.org> # 6.14.x
> Signed-off-by: SJ Park <sj@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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