linux-kernel - [PATCH v2 0/2] ublk: decouple server threads from hctxs

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Message-Id: <20250408-ublk_task_per_io-v2-0-b97877e6fd50@purestorage.com>
Date: Tue, 08 Apr 2025 19:42:06 -0600
From: Uday Shankar <ushankar@...estorage.com>
To: Ming Lei <ming.lei@...hat.com>, Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Uday Shankar <ushankar@...estorage.com>, 
 Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH v2 0/2] ublk: decouple server threads from hctxs

This patch set aims to allow ublk server threads to better balance load
amongst themselves by decoupling server threads from ublk queues/hctxs,
so that multiple threads can service I/Os from a single hctx.

Signed-off-by: Uday Shankar <ushankar@...estorage.com>
---
Changes in v2:
- Remove changes split into other patches
- To ease error handling/synchronization, associate each I/O (instead of
  each queue) to the last task that issues a FETCH_REQ against it. Only
  that task is allowed to operate on the I/O.
- Link to v1: https://lore.kernel.org/r/20241002224437.3088981-1-ushankar@purestorage.com

---
Uday Shankar (2):
      ublk: properly serialize all FETCH_REQs
      ublk: require unique task per io instead of unique task per hctx

 drivers/block/ublk_drv.c | 92 +++++++++++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 48 deletions(-)
---
base-commit: 88e581728f3f0036110126adbaa0d88d3cd3b48d
change-id: 20250408-ublk_task_per_io-c693cf608d7a

Best regards,
-- 
Uday Shankar <ushankar@...estorage.com>