lkml.org 
[lkml]   [2021]   [Nov]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH RFC 0/9] support concurrent sync io for bfq on a specail occasion
Date
Bfq can't handle sync io concurrently as long as the io are not issued
from root group currently.

Previous patch set:
https://lore.kernel.org/lkml/20211014014556.3597008-2-yukuai3@huawei.com/t/

During implemting the method mentioned by the above patch set, I found
more problems that will block implemting concurrent sync io. The
modifications of this patch set are as follows:

1) count root group into 'num_groups_with_pending_reqs';
2) don't idle if 'num_groups_with_pending_reqs' is 1;
3) If the group doesn't have pending requests while it's child groups
have pending requests, don't count the group.
4) Once the group doesn't have pending requests, decrease
'num_groups_with_pending_reqs' immediately. Don't delay to when all
it's child groups don't have pending requests.

Noted that I just tested basic functionality of this patchset, and I
think it's better to see if anyone have suggestions or better
solutions.

Yu Kuai (9):
block, bfq: add new apis to iterate bfq entities
block, bfq: apply news apis where root group is not expected
block, bfq: handle the case when for_each_entity() access root group
block, bfq: count root group into 'num_groups_with_pending_reqs'
block, bfq: do not idle if only one cgroup is activated
block, bfq: only count group that the bfq_queue belongs to
block, bfq: record how many queues have pending requests in bfq_group
block, bfq: move forward __bfq_weights_tree_remove()
block, bfq: decrease 'num_groups_with_pending_reqs' earlier

block/bfq-cgroup.c | 3 +-
block/bfq-iosched.c | 92 +++++++++++++++++++++++----------------------
block/bfq-iosched.h | 41 +++++++++++++-------
block/bfq-wf2q.c | 44 +++++++++++++++-------
4 files changed, 106 insertions(+), 74 deletions(-)

--
2.31.1

\
 
 \ /
  Last update: 2021-11-27 11:01    [W:0.187 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site