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| author | Florian Fischer <florian.fl.fischer@fau.de> | 2020-02-26 10:41:23 +0100 |
|---|---|---|
| committer | Florian Fischer <florian.fl.fischer@fau.de> | 2020-02-26 10:41:23 +0100 |
| commit | f7ebd336cb8a86b29f039d5028e6fa9aaca6d42f (patch) | |
| tree | 0808d3efcfc6602711c71e079dd508f47504a01a /src | |
| parent | 19f858f0712aa38cd61d8380c7c879dd254804ad (diff) | |
| download | allocbench-f7ebd336cb8a86b29f039d5028e6fa9aaca6d42f.tar.gz allocbench-f7ebd336cb8a86b29f039d5028e6fa9aaca6d42f.zip | |
free big allocations using madv_free
Diffstat (limited to 'src')
| -rw-r--r-- | src/speedymalloc.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/src/speedymalloc.c b/src/speedymalloc.c index 7df3c5a..7ddcafe 100644 --- a/src/speedymalloc.c +++ b/src/speedymalloc.c @@ -10,6 +10,12 @@ #define MIN_ALIGNMENT 16 +#ifdef DONTNEED +#define MY_MADVISE_FREE MADV_DONTNEED +#else +#define MY_MADVISE_FREE MADV_FREE +#endif + #ifndef MEMSIZE #define MEMSIZE 1024*4*1024*1024l #endif @@ -19,6 +25,7 @@ #endif // sizeof(tls_t) == 4096 +//#define CACHE_BINS 511 #define CACHE_BINS 511 // max cached object: 511 * 64 - 1 = 32703 #define CACHE_BIN_SEPERATION 64 @@ -29,6 +36,7 @@ extern "C" { #endif +size_t PAGE_SIZE = 0; typedef struct chunk { size_t size; // Size header field for internal use @@ -73,6 +81,8 @@ static void init_tls(void) { #ifndef NO_WILLNEED next_willneed = tls->ptr; #endif + + PAGE_SIZE = sysconf(_SC_PAGESIZE); } static void* bump_alloc(size_t size) { @@ -85,9 +95,7 @@ static void* bump_alloc(size_t size) { #ifndef NO_WILLNEED if(unlikely(tls->ptr >= next_willneed)) { - if (madvise((void*)next_willneed, WILLNEED_SIZE, MADV_WILLNEED) != 0) { - perror("madvice"); - } + madvise((void*)next_willneed, WILLNEED_SIZE, MADV_WILLNEED); next_willneed += WILLNEED_SIZE; } #endif @@ -135,6 +143,19 @@ void free(void* ptr) { chunk->next = tls->bins[bin]; tls->bins[bin] = chunk; } +#ifndef NO_FREE + else { + size_t size = chunk->size; + size -= ((uintptr_t)ptr % PAGE_SIZE); // size without part before a page boundry + size -= size % PAGE_SIZE; // size without part after a page boundry + + size_t mask = PAGE_SIZE - 1; + void* page_start = (void*)(((uintptr_t)ptr + mask) & ~mask); + //fprintf(stderr, "ptr: %p, s: %ux, pages: %ux, page_ptr: %p\n", + // ptr, chunk->size, size, page_start); + madvise(page_start, size, MY_MADVISE_FREE); + } +#endif } void* memalign(size_t alignment, size_t size) { |