libblkio
https://kvm-forum.qemu.org/2022/libblkio-kvm-forum-2022.pdf
virtio-blk + VFIO PCI to bypass the guest kernel’s virtio-blk drive
https://gitlab.com/libblkio/libblkio.git/
libblkio qemu iouring guest 中 4k randread 的结果:
- qemu_main_loop ▒
- 54.46% main_loop_wait ▒
- 53.89% os_host_main_loop_wait (inlined) ▒
- 46.13% glib_pollfds_poll (inlined) ▒
- 44.81% g_main_context_dispatch ▒
- 44.81% g_main_context_dispatch_unlocked ▒
- 44.76% aio_ctx_dispatch ▒
- 44.71% aio_dispatch ▒
- 44.69% aio_dispatch_handlers (inlined) ▒
- aio_dispatch_handler ▒
- 41.86% virtio_queue_notify_vq (inlined) ▒
- 41.85% virtio_blk_handle_vq ▒
- 36.29% defer_call_end ▒
- 36.28% blkio_deferred_fn ▒
- 36.27% blkioq_do_io ▒
blkio::handling_result_with_value (inlined) ▒
- blkio::blkioq_do_io::_$u7b$$u7b$closure$u7d$$u7d$::ha60b5b610ff6645a (inlined) ▒
- 36.26% blkio::Blkioq::do_io ▒
- <blkio::drivers::iouring::IoUringQueue as blkio::Queue>::do_io ▒
- 36.24% io_uring::submit::Submitter::enter (inlined) ▒
- io_uring::sys::io_uring_enter (inlined) ▒
- 36.24% syscall ▒
- 36.22% entry_SYSCALL_64_after_hwframe ▒
- do_syscall_64 ▒
- 36.19% __do_sys_io_uring_enter ▒
- 36.11% io_submit_sqes ▒
- 34.30% io_issue_sqe ▒
- 33.43% io_read ▒
- __io_read ▒
- 32.49% xfs_file_read_iter ▒
- xfs_file_buffered_read ▒
- 31.04% filemap_read ▒
- 17.69% copy_page_to_iter
17.45% _copy_to_iter ▒
- 11.04% filemap_get_pages ▒
- filemap_get_read_batch ▒
3.55% xas_load ▒
- 0.72% touch_atime ▒
atime_needs_update ▒
- 0.66% xfs_iunlock ▒
up_read ▒
0.52% xfs_ilock_nowait ▒
0.55% kiocb_done ▒
- 1.26% io_prep_rwv ▒
- io_prep_rw ▒
- 0.99% __io_import_iovec ▒
- __import_iovec ▒
0.66% copy_iovec_from_user ▒
- 3.79% virtio_blk_handle_request ▒
- 2.36% virtio_blk_submit_multireq ▒
- 1.43% blk_aio_preadv ▒
- blk_aio_prwv ▒
- 0.55% blk_aio_get (inlined) ▒
0.53% qemu_aio_get ▒
- 0.69% __GI___qsort_r ▒
- 0.67% msort_with_tmp.part.0 ▒
0.53% msort_with_tmp.part.0 ▒
0.52% block_acct_start ▒
- 1.54% virtio_blk_submit_multireq ▒
- 0.98% blk_aio_preadv ▒
blk_aio_prwv ▒
- 2.57% blkio_completion_fd_read ▒
- 0.94% blkioq_do_io ▒
- blkio::handling_result_with_value (inlined) ▒
- blkio::blkioq_do_io::_$u7b$$u7b$closure$u7d$$u7d$::ha60b5b610ff6645a (inlined) ▒
- 0.81% blkio::Blkioq::do_io ▒
0.64% <blkio::drivers::iouring::IoUringQueue as blkio::Queue>::do_io ▒
0.74% qemu_aio_coroutine_enter
- 1.32% g_main_context_check ▒
1.30% g_main_context_check_unlocked ▒
- 6.65% qemu_poll_ns ▒
- ppoll (inlined) ▒
- ppoll ▒
- 6.59% entry_SYSCALL_64_after_hwframe ▒
- do_syscall_64 ▒
- 6.55% __x64_sys_ppoll ▒
- 6.48% do_sys_poll ▒
- 1.54% sock_poll ▒
- 1.30% udp_poll ▒
- datagram_poll ▒
0.60% add_wait_queue ▒
- 1.52% poll_freewait ▒
0.52% remove_wait_queue ▒
1.21% fput ▒
0.76% fdget ▒
0.58% eventfd_poll ▒
- 1.06% glib_pollfds_fill (inlined) ▒
- 0.62% g_main_context_prepare ▒
0.61% g_main_context_prepare_unlocked
想要在 qemu + nixos 中使用，需要添加上这个 patch
- 还需要 checkout 到 master
- 不知道为什么 qemu 中 tests/set-completion-fd.c 测试就有问题，但是直接构建没有问题
diff --git a/build.sh b/build.sh
index bf3176ff51d9..0fe1c510833c 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
set -e
cd $(dirname $0)
diff --git a/containerized-build.sh b/containerized-build.sh
index 978514bd1710..51802167bd61 100755
--- a/containerized-build.sh
+++ b/containerized-build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
cd "$(dirname $0)"
# Build image, if it doesn't exist or is older than ./Containerfile
diff --git a/kcov-wrapper.sh b/kcov-wrapper.sh
index 9004fc576f3d..773a26a99cac 100755
--- a/kcov-wrapper.sh
+++ b/kcov-wrapper.sh
@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/usr/bin/env bash
test_name=$(basename $1_$3)
exec kcov --exclude-path=/usr/include,/usr/src/libblkio/.cargo,/usr/src/libblkio/tests kcov-runs/$test_name "$@"
diff --git a/run-test-suites-in-vm.sh b/run-test-suites-in-vm.sh
index 8411332780cd..82b486f66437 100755
--- a/run-test-suites-in-vm.sh
+++ b/run-test-suites-in-vm.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -o errexit -o pipefail -o nounset
export LANG=C
@@ -328,7 +328,7 @@ set +o errexit
__ssh_batch driverctl unset-override 0000:00:05.0
__log_info 'Running virtio-blk-vhost-user tests in guest...'
- __ssh_batch /bin/bash -c '
+ __ssh_batch /usr/bin/env bash -c '
set -e
trap "kill -TERM %1; wait" EXIT
qemu-storage-daemon \
diff --git a/src/cargo-build.sh b/src/cargo-build.sh
index 5c97ef3a8575..e0f3cdecc603 100755
--- a/src/cargo-build.sh
+++ b/src/cargo-build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -e
meson_debug="$1"
diff --git a/tests/blkio-bench.sh b/tests/blkio-bench.sh
index 8fac78b39052..a9d8bf800d98 100755
--- a/tests/blkio-bench.sh
+++ b/tests/blkio-bench.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -e
FILE="blkio-bench-file"
diff --git a/tests/blkio-copy.sh b/tests/blkio-copy.sh
index b9a37b5121c6..569d33a4f763 100755
--- a/tests/blkio-copy.sh
+++ b/tests/blkio-copy.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -e
diff --git a/tests/blkio-info.sh b/tests/blkio-info.sh
index e3198ac59927..8b9c5998644d 100755
--- a/tests/blkio-info.sh
+++ b/tests/blkio-info.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -e
FILE="blkio-info-file"
diff --git a/tests/props-blkio-info.sh b/tests/props-blkio-info.sh
index f62f79f94ec9..575b9bd9a0c8 100755
--- a/tests/props-blkio-info.sh
+++ b/tests/props-blkio-info.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
set -eu
if [[ "$#" -le 2 || "$1" != "--path" || $(($# % 2)) -ne 0 ]]; then
diff --git a/tests/set-completion-fd.c b/tests/set-completion-fd.c
index b51232df018a..0eebc24664c0 100644
--- a/tests/set-completion-fd.c
+++ b/tests/set-completion-fd.c
@@ -94,7 +94,8 @@ int main(int argc, char **argv)
char event_data[8];
do {
- read(completion_fd, event_data, sizeof(event_data));
+ int a = read(completion_fd, event_data, sizeof(event_data));
+ printf("[martins3:%s:%d] %d\n", __FUNCTION__, __LINE__, a);
n += process_completions(q, &completion);
} while (n < NUM_REQS);
--
2.47.2
fio 居然有 libblkio 的后端
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