linux-kernel - Re: [PATCH 0/2] Add BLK_FEAT_READ_SYNCHRONOUS and SWP_READ_SYNCHRONOUS

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Message-ID: <87frporxtt.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date: Wed, 25 Sep 2024 15:34:22 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Qun-Wei Lin <qun-wei.lin@...iatek.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,  Matthias Brugger
 <matthias.bgg@...il.com>,  AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>,  Ryan Roberts
 <ryan.roberts@....com>,  "David Hildenbrand" <david@...hat.com>,  Chris Li
 <chrisl@...nel.org>,  "Matthew Wilcox (Oracle)" <willy@...radead.org>,  Al
 Viro <viro@...iv.linux.org.uk>,  "Dan Schatzberg"
 <schatzberg.dan@...il.com>,  Kairui Song <kasong@...cent.com>,  Barry Song
 <baohua@...nel.org>,  Jens Axboe <axboe@...nel.dk>,
  <linux-kernel@...r.kernel.org>,  <linux-mm@...ck.org>,
  <linux-arm-kernel@...ts.infradead.org>,
  <linux-mediatek@...ts.infradead.org>,  <linux-block@...r.kernel.org>,
  Casper Li <casper.li@...iatek.com>,  "Chinwen Chang"
 <chinwen.chang@...iatek.com>,  Andrew Yang <andrew.yang@...iatek.com>,
  John Hsu <john.hsu@...iatek.com>,  <wsd_upstream@...iatek.com>
Subject: Re: [PATCH 0/2] Add BLK_FEAT_READ_SYNCHRONOUS and
 SWP_READ_SYNCHRONOUS_IO

Qun-Wei Lin <qun-wei.lin@...iatek.com> writes:

> This patchset introduces 2 new feature flags, BLK_FEAT_READ_SYNCHRONOUS and
> SWP_READ_SYNCHRONOUS_IO.
>
> These changes are motivated by the need to better accommodate certain swap
> devices that support synchronous read operations but asynchronous write
> operations.
>
> The existing BLK_FEAT_SYNCHRONOUS and SWP_SYNCHRONOUS_IO flags are not
> sufficient for these devices, as they enforce synchronous behavior for both
> read and write operations.

Which kind of device needs this?  Read fast, but write slow?

--
Best Regards,
Huang, Ying