linux-kernel - [PATCH 0/2] Change zone cache format to use less memory

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Message-Id: <20160822043402.8855-1-shaun@tancheff.com>
Date:   Sun, 21 Aug 2016 23:34:00 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Shaun Tancheff <shaun@...cheff.com>, Jens Axboe <axboe@...nel.dk>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Hannes Reinecke <hare@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Sagi Grimberg <sagig@...lanox.com>,
        Mike Christie <mchristi@...hat.com>,
        Ming Lei <ming.lei@...onical.com>,
        Josh Bingaman <josh.bingaman@...gate.com>
Subject: [PATCH 0/2] Change zone cache format to use less memory

Currently the RB-Tree zone cache is fast and flexible. It does
use a rather largish amount of ram. This model reduces the ram
required from 120 bytes per zone to 16 bytes per zone with a
moderate transformation of the blk_zone_lookup() api.

This model is predicated on the belief that most variations
on zoned media will follow a pattern of using collections of same
sized zones on a single device. Similar to the pattern of erase
blocks on flash devices being progressivly larger 16K, 64K, ...

The goal is to be able to build a descriptor which is both memory
efficient, performant, and flexible.

Shaun Tancheff (2):
  Move ZBC core setup to sd_zbc
  Migrate zone cache from RB-Tree to arrays of descriptors

 block/blk-core.c       |    2 +-
 block/blk-sysfs.c      |   31 +-
 block/blk-zoned.c      |  103 +++--
 drivers/scsi/sd.c      |   66 +--
 drivers/scsi/sd.h      |   20 +-
 drivers/scsi/sd_zbc.c  | 1037 +++++++++++++++++++++++++++++-------------------
 include/linux/blkdev.h |   82 +++-
 7 files changed, 759 insertions(+), 582 deletions(-)

-- 
2.9.3