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Merge branch 'bugfix/nvs_page_selection' into 'master'

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nvs: Fix page selection algo to consider free entry counts as well

See merge request idf/esp-idf!2240
This commit is contained in:
Ivan Grokhotkov 2018-04-16 10:32:01 +08:00
parent 5029eb4b3b 7e79471ece
commit d0d314d8f8
2 changed files with 32 additions and 9 deletions
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20
components/nvs_flash/src/nvs_pagemanager.cpp
View file

@ -125,17 +125,18 @@ esp_err_t PageManager::requestNewPage()
}
// find the page with the higest number of erased items
TPageListIterator maxErasedItemsPageIt;
size_t maxErasedItems = 0;
TPageListIterator maxUnusedItemsPageIt;
size_t maxUnusedItems = 0;
for (auto it = begin(); it != end(); ++it) {
auto erased = it->getErasedEntryCount();
if (erased > maxErasedItems) {
maxErasedItemsPageIt = it;
maxErasedItems = erased;
auto unused = Page::ENTRY_COUNT - it->getUsedEntryCount();
if (unused > maxUnusedItems) {
maxUnusedItemsPageIt = it;
maxUnusedItems = unused;
}
}
if (maxErasedItems == 0) {
if (maxUnusedItems == 0) {
return ESP_ERR_NVS_NOT_ENOUGH_SPACE;
}
@ -146,7 +147,8 @@ esp_err_t PageManager::requestNewPage()
Page* newPage = &mPageList.back();
Page* erasedPage = maxErasedItemsPageIt;
Page* erasedPage = maxUnusedItemsPageIt;
#ifndef NDEBUG
size_t usedEntries = erasedPage->getUsedEntryCount();
#endif
@ -172,7 +174,7 @@ esp_err_t PageManager::requestNewPage()
assert(usedEntries == newPage->getUsedEntryCount());
#endif
mPageList.erase(maxErasedItemsPageIt);
mPageList.erase(maxUnusedItemsPageIt);
mFreePageList.push_back(erasedPage);
return ESP_OK;

21
components/nvs_flash/test_nvs_host/test_nvs.cpp
View file

@ -1246,6 +1246,27 @@ TEST_CASE("multiple partitions access check", "[nvs]")
CHECK(v2 == 0xcafebabe);
}
TEST_CASE("nvs page selection takes into account free entries also not just erased entries", "[nvs]")
{
const size_t blob_size = Page::BLOB_MAX_SIZE;
uint8_t blob[blob_size] = {0};
SpiFlashEmulator emu(3);
TEST_ESP_OK( nvs_flash_init_custom(NVS_DEFAULT_PART_NAME, 0, 3) );
nvs_handle handle;
TEST_ESP_OK( nvs_open("test", NVS_READWRITE, &handle) );
// Fill first page
TEST_ESP_OK( nvs_set_blob(handle, "1a", blob, blob_size/3) );
TEST_ESP_OK( nvs_set_blob(handle, "1b", blob, blob_size) );
// Fill second page
TEST_ESP_OK( nvs_set_blob(handle, "2a", blob, blob_size) );
TEST_ESP_OK( nvs_set_blob(handle, "2b", blob, blob_size) );
// The item below should be able to fit the first page.
TEST_ESP_OK( nvs_set_blob(handle, "3a", blob, 4) );
TEST_ESP_OK( nvs_commit(handle) );
nvs_close(handle);
}
TEST_CASE("dump all performance data", "[nvs]")
{
std::cout << "====================" << std::endl << "Dumping benchmarks" << std::endl;