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-rw-r--r--include/block/accounting.h123
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diff --git a/include/block/accounting.h b/include/block/accounting.h
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+++ b/include/block/accounting.h
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+/*
+ * QEMU System Emulator block accounting
+ *
+ * Copyright (c) 2011 Christoph Hellwig
+ * Copyright (c) 2015 Igalia, S.L.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef BLOCK_ACCOUNTING_H
+#define BLOCK_ACCOUNTING_H
+
+#include "qemu/timed-average.h"
+#include "qemu/thread.h"
+#include "qapi/qapi-builtin-types.h"
+
+typedef struct BlockAcctTimedStats BlockAcctTimedStats;
+typedef struct BlockAcctStats BlockAcctStats;
+
+enum BlockAcctType {
+ BLOCK_ACCT_NONE = 0,
+ BLOCK_ACCT_READ,
+ BLOCK_ACCT_WRITE,
+ BLOCK_ACCT_FLUSH,
+ BLOCK_ACCT_UNMAP,
+ BLOCK_MAX_IOTYPE,
+};
+
+struct BlockAcctTimedStats {
+ BlockAcctStats *stats;
+ TimedAverage latency[BLOCK_MAX_IOTYPE];
+ unsigned interval_length; /* in seconds */
+ QSLIST_ENTRY(BlockAcctTimedStats) entries;
+};
+
+typedef struct BlockLatencyHistogram {
+ /* The following histogram is represented like this:
+ *
+ * 5| *
+ * 4| *
+ * 3| * *
+ * 2| * * *
+ * 1| * * * *
+ * +------------------
+ * 10 50 100
+ *
+ * BlockLatencyHistogram histogram = {
+ * .nbins = 4,
+ * .boundaries = {10, 50, 100},
+ * .bins = {3, 1, 5, 2},
+ * };
+ *
+ * @boundaries array define histogram intervals as follows:
+ * [0, boundaries[0]), [boundaries[0], boundaries[1]), ...
+ * [boundaries[nbins-2], +inf)
+ *
+ * So, for example above, histogram intervals are:
+ * [0, 10), [10, 50), [50, 100), [100, +inf)
+ */
+ int nbins;
+ uint64_t *boundaries; /* @nbins-1 numbers here
+ (all boundaries, except 0 and +inf) */
+ uint64_t *bins;
+} BlockLatencyHistogram;
+
+struct BlockAcctStats {
+ QemuMutex lock;
+ uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
+ uint64_t nr_ops[BLOCK_MAX_IOTYPE];
+ uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
+ uint64_t failed_ops[BLOCK_MAX_IOTYPE];
+ uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
+ uint64_t merged[BLOCK_MAX_IOTYPE];
+ int64_t last_access_time_ns;
+ QSLIST_HEAD(, BlockAcctTimedStats) intervals;
+ bool account_invalid;
+ bool account_failed;
+ BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
+};
+
+typedef struct BlockAcctCookie {
+ int64_t bytes;
+ int64_t start_time_ns;
+ enum BlockAcctType type;
+} BlockAcctCookie;
+
+void block_acct_init(BlockAcctStats *stats);
+void block_acct_setup(BlockAcctStats *stats, bool account_invalid,
+ bool account_failed);
+void block_acct_cleanup(BlockAcctStats *stats);
+void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
+BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
+ BlockAcctTimedStats *s);
+void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
+ int64_t bytes, enum BlockAcctType type);
+void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
+void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
+void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
+void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
+ int num_requests);
+int64_t block_acct_idle_time_ns(BlockAcctStats *stats);
+double block_acct_queue_depth(BlockAcctTimedStats *stats,
+ enum BlockAcctType type);
+int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
+ uint64List *boundaries);
+void block_latency_histograms_clear(BlockAcctStats *stats);
+
+#endif