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[Qemu-devel] [PATCH 0/2] coroutine: dynamically scale pool size
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 0/2] coroutine: dynamically scale pool size |
Date: |
Thu, 3 Jul 2014 15:51:59 +0200 |
The coroutine pool reuses exited coroutines to make qemu_coroutine_create()
cheap. The size of the pool is capped to prevent it from hogging memory after
a period of high coroutine activity. Previously the max size was hardcoded to
64 but this doesn't scale with guest size.
A guest with lots of disks can do more parallel I/O and therefore requires a
larger coroutine pool size. This series tries to solve the problem by scaling
pool size according to the number of drives.
Ming: Please let me know if this eliminates the rt_sigprocmask system calls you
are seeing. It should solve part of the performance regression you have seen
in qemu.git/master virtio-blk dataplane.
Stefan Hajnoczi (2):
coroutine: make pool size dynamic
block: bump coroutine pool size for drives
block.c | 4 ++++
include/block/coroutine.h | 11 +++++++++++
qemu-coroutine.c | 25 +++++++++++++++++++------
3 files changed, 34 insertions(+), 6 deletions(-)
--
1.9.3
- [Qemu-devel] [PATCH 0/2] coroutine: dynamically scale pool size,
Stefan Hajnoczi <=