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From:   Daniel Gomez <da.gomez@samsung.com>
To:     "willy@infradead.org" <willy@infradead.org>
CC:     "gost.dev@samsung.com" <gost.dev@samsung.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Pankaj Raghav <p.raghav@samsung.com>,
        "mcgrof@kernel.org" <mcgrof@kernel.org>
Subject: Re: [PATCH 0/2] XArray multi-index tests
Thread-Topic: [PATCH 0/2] XArray multi-index tests
Thread-Index: AQHaDrnumPQICHUIPEiQzctipV++ibBpVzIA
Date:   Sat, 4 Nov 2023 01:00:40 +0000
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On Sat, Nov 04, 2023 at 01:57:45AM +0100, Daniel Gomez wrote:
> Add multi-index XArray tests.
>
> Tests were first introduced as part of '[RFC PATCH 00/11] shmem: high
> order folios support in write path' [1]. I've created this new series wit=
h
> Matthew Wilcox's feedback [2] regarding test 'XArray: add cmpxchg order t=
est'.
>
> [1] https://lore.kernel.org/all/20231028211518.3424020-1-da.gomez@samsung=
.com/
> [2] https://lore.kernel.org/all/ZT68dBiJKNLXLRZA@casper.infradead.org/
>
> The full node is lost (not only the order) when using xa_cmpxchg with NUL=
L
> entry. Adding another (FIVE) entry at '1 << order' with the order informa=
tion
> does not keep the original node but duplicates it. I'm not sure if that's
> the intention from the proposal you mentioned in [2] but please, let me k=
now
> your comments.
>
> Changes since RFC:
> * Update cmpxchg test to include another entry at 1 << order that
> 'keeps' the node around and order information.
> * Update cmpxchg test to verify the entries and order in all tied
> indexes.
> * Drop previous Luis Chamberlain's review as changes are significant
> from the RFC.
* Make cmpxchg_order test conditional to CONFIG_XARRAY_MULTI.

>
> Daniel
>
> Daniel Gomez (1):
>   XArray: add cmpxchg order test
>
> Luis Chamberlain (1):
>   test_xarray: add tests for advanced multi-index use
>
>  lib/test_xarray.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 188 insertions(+)
>
> --
> 2.39.2=