cb38fffbc9
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>
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*
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* QEMU System Emulator block accounting
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*
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* Copyright (c) 2011 Christoph Hellwig
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "block/accounting.h"
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#include "block/block_int.h"
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#include "qemu/timer.h"
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static QEMUClockType clock_type = QEMU_CLOCK_REALTIME;
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void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
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int64_t bytes, enum BlockAcctType type)
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{
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assert(type < BLOCK_MAX_IOTYPE);
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cookie->bytes = bytes;
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cookie->start_time_ns = qemu_clock_get_ns(clock_type);
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cookie->type = type;
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}
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void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
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{
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int64_t time_ns = qemu_clock_get_ns(clock_type);
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int64_t latency_ns = time_ns - cookie->start_time_ns;
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assert(cookie->type < BLOCK_MAX_IOTYPE);
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stats->nr_bytes[cookie->type] += cookie->bytes;
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stats->nr_ops[cookie->type]++;
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stats->total_time_ns[cookie->type] += latency_ns;
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stats->last_access_time_ns = time_ns;
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}
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void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
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int num_requests)
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{
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assert(type < BLOCK_MAX_IOTYPE);
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stats->merged[type] += num_requests;
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}
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int64_t block_acct_idle_time_ns(BlockAcctStats *stats)
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{
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return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns;
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}
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