Avoid touching all pages in extent_recycle for debug build.
We may have a large number of pages with *zero set (since they are populated on demand). Only check the first page to avoid paging in all of them.
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@ -1162,14 +1162,15 @@ extent_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
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if (*zero) {
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void *addr = extent_base_get(extent);
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size_t size = extent_size_get(extent);
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if (!extent_zeroed_get(extent)) {
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size_t size = extent_size_get(extent);
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if (pages_purge_forced(addr, size)) {
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memset(addr, 0, size);
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}
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} else if (config_debug) {
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size_t *p = (size_t *)(uintptr_t)addr;
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for (size_t i = 0; i < size / sizeof(size_t); i++) {
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/* Check the first page only. */
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for (size_t i = 0; i < PAGE / sizeof(size_t); i++) {
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assert(p[i] == 0);
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}
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}
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