linux-kernel - Re: [PATCH] mm/truncate: reset xa_has

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Message-ID: <zdrmuzjcgxps3ivdvnmouygdct2lr6qj2avypuj3hatv746rye@7wu3txx5hyou>
Date: Wed, 2 Oct 2024 16:09:11 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, 
	Matthew Wilcox <willy@...radead.org>, Yu Zhao <yuzhao@...gle.com>, linux-fsdevel@...r.kernel.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Meta kernel team <kernel-team@...a.com>
Subject: Re: [PATCH] mm/truncate: reset xa_has_values flag on each iteration

On Wed, Oct 02, 2024 at 03:55:55PM GMT, Andrew Morton wrote:
> On Wed,  2 Oct 2024 15:51:50 -0700 Shakeel Butt <shakeel.butt@...ux.dev> wrote:
> 
> > Currently mapping_try_invalidate() and invalidate_inode_pages2_range()
> > traverses the xarray in batches and then for each batch, maintains and
> > set the flag named xa_has_values if the batch has a shadow entry to
> > clear the entries at the end of the iteration. However they forgot to
> > reset the flag at the end of the iteration which cause them to always
> > try to clear the shadow entries in the subsequent iterations where
> > there might not be any shadow entries. Fixing it.
> > 
> 
> So this is an efficiency thing, no other effects expected?
> 

Correct, just an efficiency thing.