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block: Add idle_time_ns to BlockDeviceStats

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This patch adds the new field 'idle_time_ns' to the BlockDeviceStats
structure, indicating the time that has passed since the previous I/O
operation.

It also adds the block_acct_idle_time_ns() call, to ensure that all
references to the clock type used for accounting are in the same
place. This will later allow us to use a different clock for iotests.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 7d8cfcf931453e1a2443e6626e8c1edc347c7c8a.1446044837.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2015-10-28 17:33:02 +02:00 • committed by Kevin Wolf
parent bd797fc15b
commit cb38fffbc9
6 changed files with 33 additions and 6 deletions
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12
block/accounting.c
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@ -40,12 +40,15 @@ void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
{
int64_t time_ns = qemu_clock_get_ns(clock_type);
int64_t latency_ns = time_ns - cookie->start_time_ns;
assert(cookie->type < BLOCK_MAX_IOTYPE);
stats->nr_bytes[cookie->type] += cookie->bytes;
stats->nr_ops[cookie->type]++;
stats->total_time_ns[cookie->type] +=
qemu_clock_get_ns(clock_type) - cookie->start_time_ns;
stats->total_time_ns[cookie->type] += latency_ns;
stats->last_access_time_ns = time_ns;
}
@ -55,3 +58,8 @@ void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
assert(type < BLOCK_MAX_IOTYPE);
stats->merged[type] += num_requests;
}
int64_t block_acct_idle_time_ns(BlockAcctStats *stats)
{
return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns;
}