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bdev: save mgmt_ch that spdk_bdev_io was allocated from

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This avoids having to dereference the spdk_bdev_io's
channel in the spdk_bdev_free_io() path.

Cleaning up after hotplug events should ensure that
all associated bdev_ios have been freed (not just
completed) before the bdev channels have been freed,
but this patch gives us some more wiggle room in this
area.

Results in a small (1-2%) performance degradation on
a bdevperf microbenchmark, but should result in no
noticeable difference on any real world workload.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Id8b88300fc53e8c0b83309a738a4c3bd2aeaff52

Reviewed-on: https://review.gerrithub.io/394399
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Jim Harris 2018-01-11 08:07:27 -07:00
parent cd31a31f03
commit b5f4a259bd
2 changed files with 7 additions and 2 deletions
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3
include/spdk_internal/bdev.h
View File

@ -274,6 +274,9 @@ struct spdk_bdev_io {
/** The bdev I/O channel that this was submitted on. */
struct spdk_bdev_channel *ch;
/** The mgmt channel that this I/O was allocated from. */
struct spdk_bdev_mgmt_channel *mgmt_ch;
/** bdev allocated memory associated with this request */
void *buf;

6
lib/bdev/bdev.c
View File

@ -283,7 +283,7 @@ spdk_bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
assert(bdev_io->u.bdev.iovcnt == 1);
buf = bdev_io->buf;
ch = spdk_io_channel_get_ctx(bdev_io->ch->mgmt_channel);
ch = bdev_io->mgmt_ch;
if (bdev_io->buf_len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
pool = g_bdev_mgr.buf_small_pool;
@ -754,13 +754,15 @@ spdk_bdev_get_io(struct spdk_io_channel *_ch)
}
}
bdev_io->mgmt_ch = ch;
return bdev_io;
}
static void
spdk_bdev_put_io(struct spdk_bdev_io *bdev_io)
{
struct spdk_bdev_mgmt_channel *ch = spdk_io_channel_get_ctx(bdev_io->ch->mgmt_channel);
struct spdk_bdev_mgmt_channel *ch = bdev_io->mgmt_ch;
if (bdev_io->buf != NULL) {
spdk_bdev_io_put_buf(bdev_io);