include/qemu/qdist.h

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