diff options
| -rw-r--r-- | cont.c | 21 | ||||
| -rw-r--r-- | version.h | 2 |
2 files changed, 19 insertions, 4 deletions
@@ -656,21 +656,36 @@ fiber_pool_stack_free(struct fiber_pool_stack * stack) if (DEBUG) fprintf(stderr, "fiber_pool_stack_free: %p+%"PRIuSIZE" [base=%p, size=%"PRIuSIZE"]\n", base, size, stack->base, stack->size); -#if VM_CHECK_MODE > 0 && defined(MADV_DONTNEED) + // The pages being used by the stack can be returned back to the system. + // That doesn't change the page mapping, but it does allow the system to + // reclaim the physical memory. + // Since we no longer care about the data itself, we don't need to page + // out to disk, since that is costly. Not all systems support that, so + // we try our best to select the most efficient implementation. + // In addition, it's actually slightly desirable to not do anything here, + // but that results in higher memory usage. + +#ifdef __wasi__ + // WebAssembly doesn't support madvise, so we just don't do anything. +#elif VM_CHECK_MODE > 0 && defined(MADV_DONTNEED) // This immediately discards the pages and the memory is reset to zero. madvise(base, size, MADV_DONTNEED); -#elif defined(POSIX_MADV_DONTNEED) - posix_madvise(base, size, POSIX_MADV_DONTNEED); #elif defined(MADV_FREE_REUSABLE) + // Darwin / macOS / iOS. // Acknowledge the kernel down to the task info api we make this // page reusable for future use. // As for MADV_FREE_REUSE below we ensure in the rare occasions the task was not // completed at the time of the call to re-iterate. while (madvise(base, size, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN); #elif defined(MADV_FREE) + // Recent Linux. madvise(base, size, MADV_FREE); #elif defined(MADV_DONTNEED) + // Old Linux. madvise(base, size, MADV_DONTNEED); +#elif defined(POSIX_MADV_DONTNEED) + // Solaris? + posix_madvise(base, size, POSIX_MADV_DONTNEED); #elif defined(_WIN32) VirtualAlloc(base, size, MEM_RESET, PAGE_READWRITE); // Not available in all versions of Windows. @@ -11,7 +11,7 @@ # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR #define RUBY_VERSION_TEENY 3 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR -#define RUBY_PATCHLEVEL 175 +#define RUBY_PATCHLEVEL 176 #define RUBY_RELEASE_YEAR 2022 #define RUBY_RELEASE_MONTH 11 |