1 /* 2 * Copyright (C) 2016, Emilio G. Cota <cota@braap.org> 3 * 4 * License: GNU GPL, version 2 or later. 5 * See the COPYING file in the top-level directory. 6 */ 7 #ifndef QEMU_QDIST_H 8 #define QEMU_QDIST_H 9 10 #include "qemu/bitops.h" 11 12 /* 13 * Samples with the same 'x value' end up in the same qdist_entry, 14 * e.g. inc(0.1) and inc(0.1) end up as {x=0.1, count=2}. 15 * 16 * Binning happens only at print time, so that we retain the flexibility to 17 * choose the binning. This might not be ideal for workloads that do not care 18 * much about precision and insert many samples all with different x values; 19 * in that case, pre-binning (e.g. entering both 0.115 and 0.097 as 0.1) 20 * should be considered. 21 */ 22 struct qdist_entry { 23 double x; 24 unsigned long count; 25 }; 26 27 struct qdist { 28 struct qdist_entry *entries; 29 size_t n; 30 size_t size; 31 }; 32 33 #define QDIST_PR_BORDER BIT(0) 34 #define QDIST_PR_LABELS BIT(1) 35 /* the remaining options only work if PR_LABELS is set */ 36 #define QDIST_PR_NODECIMAL BIT(2) 37 #define QDIST_PR_PERCENT BIT(3) 38 #define QDIST_PR_100X BIT(4) 39 #define QDIST_PR_NOBINRANGE BIT(5) 40 41 void qdist_init(struct qdist *dist); 42 void qdist_destroy(struct qdist *dist); 43 44 void qdist_add(struct qdist *dist, double x, long count); 45 void qdist_inc(struct qdist *dist, double x); 46 double qdist_xmin(const struct qdist *dist); 47 double qdist_xmax(const struct qdist *dist); 48 double qdist_avg(const struct qdist *dist); 49 unsigned long qdist_sample_count(const struct qdist *dist); 50 size_t qdist_unique_entries(const struct qdist *dist); 51 52 /* callers must free the returned string with g_free() */ 53 char *qdist_pr_plain(const struct qdist *dist, size_t n_groups); 54 55 /* callers must free the returned string with g_free() */ 56 char *qdist_pr(const struct qdist *dist, size_t n_groups, uint32_t opt); 57 58 /* Only qdist code and test code should ever call this function */ 59 void qdist_bin__internal(struct qdist *to, const struct qdist *from, size_t n); 60 61 #endif /* QEMU_QDIST_H */ 62