Created
February 5, 2026 04:13
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| /* | |
| * Test program for zswpraw per-cgroup stat. | |
| * Pre-compress data with zstd so kernel zswap can't compress further. | |
| * Dep: apt-get install libzstd-dev | |
| * Build: gcc -o test_zswpraw test_zswpraw.c -lzstd | |
| */ | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <zstd.h> | |
| #define MB (1024 * 1024) | |
| #define SIZE (100 * MB) | |
| int main(void) | |
| { | |
| char *src, *dst; | |
| size_t dst_size, compressed_size; | |
| /* Allocate source buffer and fill with random-ish data */ | |
| src = malloc(SIZE); | |
| if (!src) { | |
| perror("malloc src"); | |
| return 1; | |
| } | |
| for (size_t i = 0; i < SIZE; i++) | |
| src[i] = rand(); | |
| /* Compress with zstd */ | |
| dst_size = ZSTD_compressBound(SIZE); | |
| dst = malloc(dst_size); | |
| if (!dst) { | |
| perror("malloc dst"); | |
| return 1; | |
| } | |
| compressed_size = ZSTD_compress(dst, dst_size, src, SIZE, 3); | |
| if (ZSTD_isError(compressed_size)) { | |
| fprintf(stderr, "ZSTD error: %s\n", ZSTD_getErrorName(compressed_size)); | |
| return 1; | |
| } | |
| free(src); | |
| printf("Compressed %d MB -> %zu MB (%.1f%%)\n", | |
| SIZE / MB, compressed_size / MB, | |
| 100.0 * compressed_size / SIZE); | |
| printf("PID: %d, sleeping... (trigger memory.reclaim now)\n", getpid()); | |
| /* Keep compressed data in memory, sleep for reclaim test */ | |
| sleep(300); | |
| free(dst); | |
| return 0; | |
| } |
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