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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include "storcach.hxx"
#include <sal/log.hxx>
#include <sal/types.h>
#include <sal/macros.h>
#include <rtl/alloc.h>
#include <osl/diagnose.h>
#include <store/types.h>
#include "storbase.hxx"
#include <memory>
#include <string.h>
using namespace store;
namespace store {
struct Entry
{
std::shared_ptr<PageData> m_xPage;
sal_uInt32 m_nOffset;
Entry * m_pNext;
static void * operator new (size_t, void * p) { return p; }
static void operator delete (void *, void *) {}
explicit Entry (std::shared_ptr<PageData> const & rxPage, sal_uInt32 nOffset)
: m_xPage(rxPage), m_nOffset(nOffset), m_pNext(nullptr)
{}
};
};
namespace
{
class EntryCache
{
rtl_cache_type * m_entry_cache;
public:
static EntryCache & get();
Entry * create (std::shared_ptr<PageData> const & rxPage, sal_uInt32 nOffset);
void destroy (Entry * entry);
protected:
EntryCache();
~EntryCache();
};
} // namespace
EntryCache & EntryCache::get()
{
static EntryCache g_entry_cache;
return g_entry_cache;
}
EntryCache::EntryCache()
{
m_entry_cache = rtl_cache_create (
"store_cache_entry_cache",
sizeof(Entry),
0, // objalign
nullptr, // constructor
nullptr, // destructor
nullptr, // reclaim
nullptr, // userarg
nullptr, // default source
0 // flags
);
}
EntryCache::~EntryCache()
{
rtl_cache_destroy (m_entry_cache);
m_entry_cache = nullptr;
}
Entry * EntryCache::create (std::shared_ptr<PageData> const & rxPage, sal_uInt32 nOffset)
{
void * pAddr = rtl_cache_alloc (m_entry_cache);
if (pAddr != nullptr)
{
// construct
return new(pAddr) Entry (rxPage, nOffset);
}
return nullptr;
}
void EntryCache::destroy (Entry * entry)
{
if (entry != nullptr)
{
// destruct
entry->~Entry();
// return to cache
rtl_cache_free (m_entry_cache, entry);
}
}
// highbit():= log2() + 1 (complexity O(1))
static int highbit(std::size_t n)
{
int k = 1;
if (n == 0)
return 0;
if constexpr (sizeof(n) == 8)
{
if (n & 0xffffffff00000000)
{
k |= 32;
n >>= 32;
}
}
if (n & 0xffff0000)
{
k |= 16;
n >>= 16;
}
if (n & 0xff00)
{
k |= 8;
n >>= 8;
}
if (n & 0xf0)
{
k |= 4;
n >>= 4;
}
if (n & 0x0c)
{
k |= 2;
n >>= 2;
}
if (n & 0x02)
k++;
return k;
}
PageCache::PageCache (sal_uInt16 nPageSize)
: m_hash_table (m_hash_table_0),
m_hash_size (theTableSize),
m_hash_shift (highbit(m_hash_size) - 1),
m_page_shift (highbit(nPageSize) - 1),
m_hash_entries (0),
m_nHit (0),
m_nMissed (0)
{
static size_t const theSize = SAL_N_ELEMENTS(m_hash_table_0);
static_assert(theSize == theTableSize, "must be equal");
}
PageCache::~PageCache()
{
double s_x = 0.0;
std::size_t i, n = m_hash_size;
for (i = 0; i < n; i++)
{
int x = 0;
Entry * entry = m_hash_table[i];
while (entry != nullptr)
{
m_hash_table[i] = entry->m_pNext;
entry->m_pNext = nullptr;
EntryCache::get().destroy (entry);
entry = m_hash_table[i];
x += 1;
}
s_x += double(x);
}
double ave = s_x / double(n);
SAL_INFO("store", "avg hash chain length: " << ave);
if (m_hash_table != m_hash_table_0)
{
std::free (m_hash_table);
m_hash_table = m_hash_table_0;
m_hash_size = theTableSize;
m_hash_shift = highbit(m_hash_size) - 1;
}
SAL_INFO("store", "Hits: " << m_nHit << ", Misses: " << m_nMissed);
}
void PageCache::rescale_Impl (std::size_t new_size)
{
std::size_t new_bytes = new_size * sizeof(Entry*);
Entry ** new_table = static_cast<Entry**>(std::malloc(new_bytes));
if (new_table == nullptr)
return;
Entry ** old_table = m_hash_table;
std::size_t old_size = m_hash_size;
SAL_INFO(
"store",
"ave chain length: " << (m_hash_entries >> m_hash_shift)
<< ", total entries: " << m_hash_entries << " [old_size: "
<< old_size << " new_size: " << new_size << "]");
memset (new_table, 0, new_bytes);
m_hash_table = new_table;
m_hash_size = new_size;
m_hash_shift = highbit(m_hash_size) - 1;
std::size_t i;
for (i = 0; i < old_size; i++)
{
Entry * curr = old_table[i];
while (curr != nullptr)
{
Entry * next = curr->m_pNext;
int index = hash_index_Impl(curr->m_nOffset);
curr->m_pNext = m_hash_table[index];
m_hash_table[index] = curr;
curr = next;
}
old_table[i] = nullptr;
}
if (old_table != m_hash_table_0)
{
std::free (old_table);
}
}
Entry * PageCache::lookup_Impl (Entry * entry, sal_uInt32 nOffset)
{
int lookups = 0;
while (entry != nullptr)
{
if (entry->m_nOffset == nOffset)
break;
lookups += 1;
entry = entry->m_pNext;
}
if (lookups > 2)
{
std::size_t new_size = m_hash_size, ave = m_hash_entries >> m_hash_shift;
for (; ave > 4; new_size *= 2, ave /= 2)
continue;
if (new_size != m_hash_size)
rescale_Impl (new_size);
}
return entry;
}
storeError PageCache::lookupPageAt (std::shared_ptr<PageData> & rxPage, sal_uInt32 nOffset)
{
OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::PageCache::lookupPageAt(): invalid Offset");
if (nOffset == STORE_PAGE_NULL)
return store_E_CantSeek;
int index = hash_index_Impl(nOffset);
Entry const * entry = lookup_Impl (m_hash_table[index], nOffset);
if (entry != nullptr)
{
// Existing entry.
rxPage = entry->m_xPage;
// Update stats and leave.
m_nHit += 1;
return store_E_None;
}
// Cache miss. Update stats and leave.
m_nMissed += 1;
return store_E_NotExists;
}
storeError PageCache::insertPageAt (std::shared_ptr<PageData> const & rxPage, sal_uInt32 nOffset)
{
// [SECURITY:ValInput]
PageData const * pagedata = rxPage.get();
OSL_PRECOND(!(pagedata == nullptr), "store::PageCache::insertPageAt(): invalid Page");
if (pagedata == nullptr)
return store_E_InvalidParameter;
sal_uInt32 const offset = pagedata->location();
OSL_PRECOND(!(nOffset != offset), "store::PageCache::insertPageAt(): inconsistent Offset");
if (nOffset != offset)
return store_E_InvalidParameter;
OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::PageCache::insertPageAt(): invalid Offset");
if (nOffset == STORE_PAGE_NULL)
return store_E_CantSeek;
Entry * entry = EntryCache::get().create (rxPage, nOffset);
if (entry != nullptr)
{
// Insert new entry.
int index = hash_index_Impl(nOffset);
entry->m_pNext = m_hash_table[index];
m_hash_table[index] = entry;
// Update stats and leave.
m_hash_entries += 1;
return store_E_None;
}
return store_E_OutOfMemory;
}
storeError PageCache::updatePageAt (std::shared_ptr<PageData> const & rxPage, sal_uInt32 nOffset)
{
// [SECURITY:ValInput]
PageData const * pagedata = rxPage.get();
OSL_PRECOND(!(pagedata == nullptr), "store::PageCache::updatePageAt(): invalid Page");
if (pagedata == nullptr)
return store_E_InvalidParameter;
sal_uInt32 const offset = pagedata->location();
OSL_PRECOND(!(nOffset != offset), "store::PageCache::updatePageAt(): inconsistent Offset");
if (nOffset != offset)
return store_E_InvalidParameter;
OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::PageCache::updatePageAt(): invalid Offset");
if (nOffset == STORE_PAGE_NULL)
return store_E_CantSeek;
int index = hash_index_Impl(nOffset);
Entry * entry = lookup_Impl (m_hash_table[index], nOffset);
if (entry != nullptr)
{
// Update existing entry.
entry->m_xPage = rxPage;
// Update stats and leave. // m_nUpdHit += 1;
return store_E_None;
}
return insertPageAt (rxPage, nOffset);
}
storeError PageCache::removePageAt (sal_uInt32 nOffset)
{
OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::PageCache::removePageAt(): invalid Offset");
if (nOffset == STORE_PAGE_NULL)
return store_E_CantSeek;
Entry ** ppEntry = &(m_hash_table[hash_index_Impl(nOffset)]);
while (*ppEntry != nullptr)
{
if ((*ppEntry)->m_nOffset == nOffset)
{
// Existing entry.
Entry * entry = *ppEntry;
// Dequeue and destroy entry.
(*ppEntry) = entry->m_pNext;
entry->m_pNext = nullptr;
EntryCache::get().destroy (entry);
// Update stats and leave.
m_hash_entries -= 1;
return store_E_None;
}
ppEntry = &((*ppEntry)->m_pNext);
}
return store_E_NotExists;
}
/**
Old OStorePageCache implementation.
(two-way association (sorted address array, LRU chain)).
(external PageData representation).
*/
namespace store {
storeError
PageCache_createInstance (
rtl::Reference< store::PageCache > & rxCache,
sal_uInt16 nPageSize)
{
rxCache = new PageCache (nPageSize);
if (!rxCache.is())
return store_E_OutOfMemory;
return store_E_None;
}
} // namespace store
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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