Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 412 insertions, 0 deletions

diff --git a/storage/perfschema/pfs_digest.cc b/storage/perfschema/pfs_digest.cc
new file mode 100644
index 00000000..6f0b93f9
--- /dev/null
+++ b/storage/perfschema/pfs_digest.cc
@@ -0,0 +1,412 @@
+/* Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2.0,
+  as published by the Free Software Foundation.
+
+  This program is also distributed with certain software (including
+  but not limited to OpenSSL) that is licensed under separate terms,
+  as designated in a particular file or component or in included license
+  documentation.  The authors of MySQL hereby grant you an additional
+  permission to link the program and your derivative works with the
+  separately licensed software that they have included with MySQL.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License, version 2.0, for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/**
+  @file storage/perfschema/pfs_digest.h
+  Statement Digest data structures (implementation).
+*/
+
+/*
+  This code needs extra visibility in the lexer structures
+*/
+
+#define MYSQL_LEX 1
+
+#include "my_global.h"
+#include "my_sys.h"
+#include "pfs_instr.h"
+#include "pfs_digest.h"
+#include "pfs_global.h"
+#include "pfs_builtin_memory.h"
+#include "table_helper.h"
+#include "sql_lex.h"
+#include "sql_signal.h"
+#include "sql_get_diagnostics.h"
+#include "sql_string.h"
+#include <string.h>
+
+size_t digest_max= 0;
+ulong digest_lost= 0;
+
+/** EVENTS_STATEMENTS_HISTORY_LONG circular buffer. */
+PFS_statements_digest_stat *statements_digest_stat_array= NULL;
+static unsigned char *statements_digest_token_array= NULL;
+/** Consumer flag for table EVENTS_STATEMENTS_SUMMARY_BY_DIGEST. */
+bool flag_statements_digest= true;
+/**
+  Current index in Stat array where new record is to be inserted.
+  index 0 is reserved for "all else" case when entire array is full.
+*/
+static PFS_ALIGNED PFS_cacheline_uint32 digest_monotonic_index;
+
+bool digest_full= false;
+
+LF_HASH digest_hash;
+static bool digest_hash_inited= false;
+
+/**
+  Initialize table EVENTS_STATEMENTS_SUMMARY_BY_DIGEST.
+  @param param performance schema sizing
+*/
+int init_digest(const PFS_global_param *param)
+{
+  /*
+    Allocate memory for statements_digest_stat_array based on
+    performance_schema_digests_size values
+  */
+  digest_max= param->m_digest_sizing;
+  digest_lost= 0;
+  PFS_atomic::store_u32(& digest_monotonic_index.m_u32, 1);
+  digest_full= false;
+
+  if (digest_max == 0)
+    return 0;
+
+  statements_digest_stat_array=
+    PFS_MALLOC_ARRAY(& builtin_memory_digest,
+                     digest_max,
+                     sizeof(PFS_statements_digest_stat), PFS_statements_digest_stat,
+                     MYF(MY_ZEROFILL));
+
+  if (unlikely(statements_digest_stat_array == NULL))
+  {
+    cleanup_digest();
+    return 1;
+  }
+
+  if (pfs_max_digest_length > 0)
+  {
+    /* Size of each digest array. */
+    size_t digest_memory_size= pfs_max_digest_length * sizeof(unsigned char);
+
+    statements_digest_token_array=
+      PFS_MALLOC_ARRAY(& builtin_memory_digest_tokens,
+                       digest_max,
+                       digest_memory_size,
+                       unsigned char,
+                       MYF(MY_ZEROFILL));
+
+    if (unlikely(statements_digest_token_array == NULL))
+    {
+      cleanup_digest();
+      return 1;
+    }
+  }
+
+  for (size_t index= 0; index < digest_max; index++)
+  {
+    statements_digest_stat_array[index].reset_data(statements_digest_token_array
+                                                   + index * pfs_max_digest_length, pfs_max_digest_length);
+  }
+
+  /* Set record[0] as allocated. */
+  statements_digest_stat_array[0].m_lock.set_allocated();
+
+  /* Set record[0] as allocated. */
+  statements_digest_stat_array[0].m_lock.set_allocated();
+
+  return 0;
+}
+
+/** Cleanup table EVENTS_STATEMENTS_SUMMARY_BY_DIGEST. */
+void cleanup_digest(void)
+{
+  PFS_FREE_ARRAY(& builtin_memory_digest,
+                 digest_max,
+                 sizeof(PFS_statements_digest_stat),
+                 statements_digest_stat_array);
+
+  PFS_FREE_ARRAY(& builtin_memory_digest_tokens,
+                 digest_max,
+                 (pfs_max_digest_length * sizeof(unsigned char)),
+                 statements_digest_token_array);
+
+  statements_digest_stat_array= NULL;
+  statements_digest_token_array= NULL;
+}
+
+C_MODE_START
+static uchar *digest_hash_get_key(const uchar *entry, size_t *length,
+                                  my_bool)
+{
+  const PFS_statements_digest_stat * const *typed_entry;
+  const PFS_statements_digest_stat *digest;
+  const void *result;
+  typed_entry= reinterpret_cast<const PFS_statements_digest_stat*const*>(entry);
+  DBUG_ASSERT(typed_entry != NULL);
+  digest= *typed_entry;
+  DBUG_ASSERT(digest != NULL);
+  *length= sizeof (PFS_digest_key);
+  result= & digest->m_digest_key;
+  return const_cast<uchar*> (reinterpret_cast<const uchar*> (result));
+}
+C_MODE_END
+
+
+/**
+  Initialize the digest hash.
+  @return 0 on success
+*/
+int init_digest_hash(const PFS_global_param *param)
+{
+  if ((! digest_hash_inited) && (param->m_digest_sizing != 0))
+  {
+    lf_hash_init(&digest_hash, sizeof(PFS_statements_digest_stat*),
+                 LF_HASH_UNIQUE, 0, 0, digest_hash_get_key,
+                 &my_charset_bin);
+    digest_hash_inited= true;
+  }
+  return 0;
+}
+
+void cleanup_digest_hash(void)
+{
+  if (digest_hash_inited)
+  {
+    lf_hash_destroy(&digest_hash);
+    digest_hash_inited= false;
+  }
+}
+
+static LF_PINS* get_digest_hash_pins(PFS_thread *thread)
+{
+  if (unlikely(thread->m_digest_hash_pins == NULL))
+  {
+    if (!digest_hash_inited)
+      return NULL;
+    thread->m_digest_hash_pins= lf_hash_get_pins(&digest_hash);
+  }
+  return thread->m_digest_hash_pins;
+}
+
+PFS_statement_stat*
+find_or_create_digest(PFS_thread *thread,
+                      const sql_digest_storage *digest_storage,
+                      const char *schema_name,
+                      uint schema_name_length)
+{
+  DBUG_ASSERT(digest_storage != NULL);
+
+  if (statements_digest_stat_array == NULL)
+    return NULL;
+
+  if (digest_storage->m_byte_count <= 0)
+    return NULL;
+
+  LF_PINS *pins= get_digest_hash_pins(thread);
+  if (unlikely(pins == NULL))
+    return NULL;
+
+  /*
+    Note: the LF_HASH key is a block of memory,
+    make sure to clean unused bytes,
+    so that memcmp() can compare keys.
+  */
+  PFS_digest_key hash_key;
+  memset(& hash_key, 0, sizeof(hash_key));
+  /* Compute MD5 Hash of the tokens received. */
+  compute_digest_md5(digest_storage, hash_key.m_md5);
+  memcpy((void*)& digest_storage->m_md5, &hash_key.m_md5, MD5_HASH_SIZE);
+  /* Add the current schema to the key */
+  hash_key.m_schema_name_length= schema_name_length;
+  if (schema_name_length > 0)
+    memcpy(hash_key.m_schema_name, schema_name, schema_name_length);
+
+  int res;
+  uint retry_count= 0;
+  const uint retry_max= 3;
+  size_t safe_index;
+  size_t attempts= 0;
+  PFS_statements_digest_stat **entry;
+  PFS_statements_digest_stat *pfs= NULL;
+  pfs_dirty_state dirty_state;
+
+  ulonglong now= my_hrtime().val;
+
+search:
+
+  /* Lookup LF_HASH using this new key. */
+  entry= reinterpret_cast<PFS_statements_digest_stat**>
+    (lf_hash_search(&digest_hash, pins,
+                    &hash_key, sizeof(PFS_digest_key)));
+
+  if (entry && (entry != MY_ERRPTR))
+  {
+    /* If digest already exists, update stats and return. */
+    pfs= *entry;
+    pfs->m_last_seen= now;
+    lf_hash_search_unpin(pins);
+    return & pfs->m_stat;
+  }
+
+  lf_hash_search_unpin(pins);
+
+  if (digest_full)
+  {
+    /* digest_stat array is full. Add stat at index 0 and return. */
+    pfs= &statements_digest_stat_array[0];
+    digest_lost++;
+
+    if (pfs->m_first_seen == 0)
+      pfs->m_first_seen= now;
+    pfs->m_last_seen= now;
+    return & pfs->m_stat;
+  }
+
+  while (++attempts <= digest_max)
+  {
+    safe_index= PFS_atomic::add_u32(& digest_monotonic_index.m_u32, 1) % digest_max;
+    if (safe_index == 0)
+    {
+      /* Record [0] is reserved. */
+      continue;
+    }
+
+    /* Add a new record in digest stat array. */
+    DBUG_ASSERT(safe_index < digest_max);
+    pfs= &statements_digest_stat_array[safe_index];
+
+    if (pfs->m_lock.is_free())
+    {
+      if (pfs->m_lock.free_to_dirty(& dirty_state))
+      {
+        /* Copy digest hash/LF Hash search key. */
+        memcpy(& pfs->m_digest_key, &hash_key, sizeof(PFS_digest_key));
+
+        /*
+          Copy digest storage to statement_digest_stat_array so that it could be
+          used later to generate digest text.
+        */
+        pfs->m_digest_storage.copy(digest_storage);
+
+        pfs->m_first_seen= now;
+        pfs->m_last_seen= now;
+
+        res= lf_hash_insert(&digest_hash, pins, &pfs);
+        if (likely(res == 0))
+        {
+          pfs->m_lock.dirty_to_allocated(& dirty_state);
+          return & pfs->m_stat;
+        }
+
+        pfs->m_lock.dirty_to_free(& dirty_state);
+
+        if (res > 0)
+        {
+          /* Duplicate insert by another thread */
+          if (++retry_count > retry_max)
+          {
+            /* Avoid infinite loops */
+            digest_lost++;
+            return NULL;
+          }
+          goto search;
+        }
+
+        /* OOM in lf_hash_insert */
+        digest_lost++;
+        return NULL;
+      }
+    }
+  }
+
+  /* The digest array is now full. */
+  digest_full= true;
+  pfs= &statements_digest_stat_array[0];
+
+  if (pfs->m_first_seen == 0)
+    pfs->m_first_seen= now;
+  pfs->m_last_seen= now;
+  return & pfs->m_stat;
+}
+
+void purge_digest(PFS_thread* thread, PFS_digest_key *hash_key)
+{
+  LF_PINS *pins= get_digest_hash_pins(thread);
+  if (unlikely(pins == NULL))
+    return;
+
+  PFS_statements_digest_stat **entry;
+
+  /* Lookup LF_HASH using this new key. */
+  entry= reinterpret_cast<PFS_statements_digest_stat**>
+    (lf_hash_search(&digest_hash, pins,
+                    hash_key, sizeof(PFS_digest_key)));
+
+  if (entry && (entry != MY_ERRPTR))
+  {
+    lf_hash_delete(&digest_hash, pins,
+                   hash_key, sizeof(PFS_digest_key));
+  }
+  lf_hash_search_unpin(pins);
+  return;
+}
+
+void PFS_statements_digest_stat::reset_data(unsigned char *token_array, size_t length)
+{
+  pfs_dirty_state dirty_state;
+  m_lock.set_dirty(& dirty_state);
+  m_digest_storage.reset(token_array, length);
+  m_stat.reset();
+  m_first_seen= 0;
+  m_last_seen= 0;
+  m_lock.dirty_to_free(& dirty_state);
+}
+
+void PFS_statements_digest_stat::reset_index(PFS_thread *thread)
+{
+  /* Only remove entries that exists in the HASH index. */
+  if (m_digest_storage.m_byte_count > 0)
+  {
+    purge_digest(thread, & m_digest_key);
+  }
+}
+
+void reset_esms_by_digest()
+{
+  uint index;
+
+  if (statements_digest_stat_array == NULL)
+    return;
+
+  PFS_thread *thread= PFS_thread::get_current_thread();
+  if (unlikely(thread == NULL))
+    return;
+
+  /* Reset statements_digest_stat_array. */
+  for (index= 0; index < digest_max; index++)
+  {
+    statements_digest_stat_array[index].reset_index(thread);
+    statements_digest_stat_array[index].reset_data(statements_digest_token_array + index * pfs_max_digest_length, pfs_max_digest_length);
+  }
+
+  /* Mark record[0] as allocated again. */
+  statements_digest_stat_array[0].m_lock.set_allocated();
+
+  /*
+    Reset index which indicates where the next calculated digest information
+    to be inserted in statements_digest_stat_array.
+  */
+  PFS_atomic::store_u32(& digest_monotonic_index.m_u32, 1);
+  digest_full= false;
+}
+