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malloc: Decorate malloc maps
Add anonymous mmap annotations on loader malloc, malloc when it allocates memory with mmap, and on malloc arena. The /proc/self/maps will now print: [anon: glibc: malloc arena] [anon: glibc: malloc] [anon: glibc: loader malloc] On arena allocation, glibc annotates only the read/write mapping. Checked on x86_64-linux-gnu and aarch64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>
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@ -2983,3 +2983,7 @@ $(objpfx)tst-dlclose-lazy.out: \
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$(objpfx)tst-dlclose-lazy-mod1.so $(objpfx)tst-dlclose-lazy-mod2.so
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$(objpfx)tst-decorate-maps: $(shared-thread-library)
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tst-decorate-maps-ENV = \
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GLIBC_TUNABLES=glibc.malloc.arena_max=8:glibc.malloc.mmap_threshold=1024
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tst-decorate-maps-ARGS = 8
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@ -26,6 +26,7 @@
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#include <string.h>
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#include <ldsodefs.h>
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#include <malloc/malloc-internal.h>
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#include <setvmaname.h>
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static void *alloc_ptr, *alloc_end, *alloc_last_block;
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@ -60,6 +61,7 @@ __minimal_malloc (size_t n)
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MAP_ANON|MAP_PRIVATE, -1, 0);
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if (page == MAP_FAILED)
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return NULL;
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__set_vma_name (page, nup, " glibc: loader malloc");
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if (page != alloc_end)
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alloc_ptr = page;
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alloc_end = page + nup;
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@ -32,15 +32,21 @@
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static pthread_barrier_t b;
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static int expected_n_arenas;
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static void *
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tf (void *closure)
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{
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void *p = xmalloc (1024);
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/* Wait the thread startup, so thread stack is allocated. */
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xpthread_barrier_wait (&b);
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/* Wait the test to read the process mapping. */
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xpthread_barrier_wait (&b);
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free (p);
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return NULL;
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}
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@ -48,6 +54,9 @@ struct proc_maps_t
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{
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int n_def_threads;
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int n_user_threads;
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int n_arenas;
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int n_malloc_mmap;
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int n_loader_malloc_mmap;
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};
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static struct proc_maps_t
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@ -69,6 +78,12 @@ read_proc_maps (void)
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r.n_def_threads++;
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else if (strstr (line, "[anon: glibc: pthread user stack:") != NULL)
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r.n_user_threads++;
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else if (strstr (line, "[anon: glibc: malloc arena]") != NULL)
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r.n_arenas++;
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else if (strstr (line, "[anon: glibc: malloc]") != NULL)
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r.n_malloc_mmap++;
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else if (strstr (line, "[anon: glibc: loader malloc]") != NULL)
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r.n_loader_malloc_mmap++;
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}
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free (line);
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xfclose (f);
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@ -90,6 +105,9 @@ do_test_threads (bool set_guard)
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xpthread_barrier_init (&b, NULL, num_threads + 1);
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/* Issue a large malloc to trigger a mmap call. */
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void *p = xmalloc (256 * 1024);
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pthread_t thr[num_threads];
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{
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int i = 0;
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@ -128,6 +146,10 @@ do_test_threads (bool set_guard)
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struct proc_maps_t r = read_proc_maps ();
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TEST_COMPARE (r.n_def_threads, num_def_threads);
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TEST_COMPARE (r.n_user_threads, num_user_threads);
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TEST_COMPARE (r.n_arenas, expected_n_arenas);
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TEST_COMPARE (r.n_malloc_mmap, 1);
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/* On some architectures the loader might use more than one page. */
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TEST_VERIFY (r.n_loader_malloc_mmap >= 1);
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}
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/* Let the threads finish. */
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@ -140,9 +162,23 @@ do_test_threads (bool set_guard)
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struct proc_maps_t r = read_proc_maps ();
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TEST_COMPARE (r.n_def_threads, 0);
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TEST_COMPARE (r.n_user_threads, 0);
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TEST_COMPARE (r.n_arenas, expected_n_arenas);
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TEST_COMPARE (r.n_malloc_mmap, 1);
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TEST_VERIFY (r.n_loader_malloc_mmap >= 1);
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}
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free (p);
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}
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static void
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do_prepare (int argc, char *argv[])
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{
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TEST_VERIFY_EXIT (argc == 2);
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expected_n_arenas = strtol (argv[1], NULL, 10);
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expected_n_arenas = expected_n_arenas - 1;
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}
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#define PREPARE do_prepare
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static int
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do_test (void)
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{
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@ -17,6 +17,7 @@
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not, see <https://www.gnu.org/licenses/>. */
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#include <stdbool.h>
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#include <setvmaname.h>
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#define TUNABLE_NAMESPACE malloc
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#include <elf/dl-tunables.h>
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@ -436,6 +437,9 @@ alloc_new_heap (size_t size, size_t top_pad, size_t pagesize,
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return 0;
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}
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/* Only considere the actual usable range. */
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__set_vma_name (p2, size, " glibc: malloc arena");
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madvise_thp (p2, size);
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h = (heap_info *) p2;
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@ -218,6 +218,7 @@
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#include <sys/sysinfo.h>
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#include <ldsodefs.h>
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#include <setvmaname.h>
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#include <unistd.h>
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#include <stdio.h> /* needed for malloc_stats */
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@ -2428,6 +2429,8 @@ sysmalloc_mmap (INTERNAL_SIZE_T nb, size_t pagesize, int extra_flags, mstate av)
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madvise_thp (mm, size);
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#endif
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__set_vma_name (mm, size, " glibc: malloc");
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/*
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The offset to the start of the mmapped region is stored in the prev_size
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field of the chunk. This allows us to adjust returned start address to
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@ -2513,6 +2516,8 @@ sysmalloc_mmap_fallback (long int *s, INTERNAL_SIZE_T nb,
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madvise_thp (mbrk, size);
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#endif
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__set_vma_name (mbrk, size, " glibc: malloc");
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/* Record that we no longer have a contiguous sbrk region. After the first
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time mmap is used as backup, we do not ever rely on contiguous space
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since this could incorrectly bridge regions. */
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@ -699,6 +699,10 @@ tst-audit-threads-ENV = LD_AUDIT=$(objpfx)tst-audit-threads-mod1.so
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tst-setuid1-static-ENV = \
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LD_LIBRARY_PATH=$(ld-library-path):$(common-objpfx)elf:$(common-objpfx)nss
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tst-pthread-proc-maps-ENV = \
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GLIBC_TUNABLES=glibc.malloc.arena_max=8:glibc.malloc.mmap_threshold=1024
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tst-pthread-proc-maps-ARGS = 8
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# The tests here better do not run in parallel.
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ifeq ($(run-built-tests),yes)
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ifneq ($(filter %tests,$(MAKECMDGOALS)),)
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