From: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
To: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Catalin Marinas <catalin.marinas@arm.com>,
harry.yoo@oracle.com, akpm@linux-foundation.org,
hao.li@linux.dev, cl@gentwo.org, rientjes@google.com,
roman.gushchin@linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
stern@rowland.harvard.edu, linux@roeck-us.net,
andy.shevchenko@gmail.com, hch@lst.de, Jeff.kirsher@gmail.com,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH] mm/slab: align kmalloc to cacheline when DMA API debugging is active
Date: Fri, 27 Mar 2026 19:37:08 +0500 [thread overview]
Message-ID: <CABXGCsNDfuLQ64r=sMyJ0UYbzZT_j8xsH5h0gpAGTPwV64Qp2g@mail.gmail.com> (raw)
In-Reply-To: <bfa5ff0a-8ef9-46cb-8881-396f71ed5be0@kernel.org>
On Fri, Mar 27, 2026 at 7:30 PM Vlastimil Babka (SUSE)
<vbabka@kernel.org> wrote:
>
> So what about Harry's proposal [1]? Mikhail seems to be on board? [2]
>
> It seems it would achieve the goal that enabling DMA_API_DEBUG doesn't
> change the kernel behavior? But I don't know this area too well so
> maybe there's a catch.
>
> [1] https://lore.kernel.org/all/acYlxRBhSMcwBnja@hyeyoo/
> [2] https://lore.kernel.org/all/CABXGCsO_C8%2B%2B4%2BoPfZ%2BbQyrBnEGy5JFpXHkGNpfy%2B8%3D5BvVNfg@mail.gmail.com/
Hi Vlastimil,
Yes, I've already sent v2 based on Harry's suggestion:
https://lore.kernel.org/all/20260327124156.24820-1-mikhail.v.gavrilov@gmail.com/
It adds a dma_get_cache_alignment() >= L1_CACHE_BYTES check in
add_dma_entry() instead of changing ARCH_KMALLOC_MINALIGN, so
enabling DMA_API_DEBUG no longer affects allocator behavior.
--
Best Regards,
Mike Gavrilov.
next prev parent reply other threads:[~2026-03-27 14:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-27 5:58 Mikhail Gavrilov
2026-03-27 6:37 ` Harry Yoo (Oracle)
2026-03-27 6:50 ` Mikhail Gavrilov
2026-03-27 8:00 ` Harry Yoo (Oracle)
2026-03-27 8:07 ` Mikhail Gavrilov
2026-03-27 8:43 ` Harry Yoo (Oracle)
2026-03-27 10:25 ` Mikhail Gavrilov
2026-03-27 10:39 ` Harry Yoo (Oracle)
2026-03-27 6:41 ` Guenter Roeck
2026-03-27 12:26 ` Catalin Marinas
2026-03-27 12:34 ` Andy Shevchenko
2026-03-27 14:09 ` Marek Szyprowski
2026-03-27 14:30 ` Vlastimil Babka (SUSE)
2026-03-27 14:37 ` Mikhail Gavrilov [this message]
2026-03-27 14:41 ` Marek Szyprowski
2026-03-27 14:55 ` Marek Szyprowski
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