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If pthread_create() is linked into the binary, then the cosmo runtime will create an independent dlmalloc arena for each core. Whenever the malloc() function is used it will index `g_heaps[sched_getcpu() / 2]` to find the arena with the greatest hyperthread / numa locality. This may be configured via an environment variable. For example if you say `export COSMOPOLITAN_HEAP_COUNT=1` then you can restore the old ways. Your process may be configured to have anywhere between 1 - 128 heaps We need this revision because it makes multithreaded C++ applications faster. For example, an HTTP server I'm working on that makes extreme use of the STL went from 16k to 2000k requests per second, after this change was made. To understand why, try out the malloc_test benchmark which calls malloc() + realloc() in a loop across many threads, which sees a a 250x improvement in process clock time and 200x on wall time The tradeoff is this adds ~25ns of latency to individual malloc calls compared to MODE=tiny, once the cosmo runtime has transitioned into a fully multi-threaded state. If you don't need malloc() to be scalable then cosmo provides many options for you. For starters the heap count variable above can be set to put the process back in single heap mode plus you can go even faster still, if you include tinymalloc.inc like many of the programs in tool/build/.. are already doing since that'll shave tens of kb off your binary footprint too. Theres also MODE=tiny which is configured to use just 1 plain old dlmalloc arena by default Another tradeoff is we need more memory now (except in MODE=tiny), to track the provenance of memory allocation. This is so allocations can be freely shared across threads, and because OSes can reschedule code to different CPUs at any time.
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_INTRIN_ASAN_H_
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#define COSMOPOLITAN_LIBC_INTRIN_ASAN_H_
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#include "libc/calls/struct/iovec.h"
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#include "libc/intrin/asancodes.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/stackframe.h"
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COSMOPOLITAN_C_START_
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#ifdef MODE_DBG
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// MODE=dbg
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// O(32mb) of morgue memory
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// Θ(64) bytes of malloc overhead
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#define ASAN_MORGUE_ITEMS 512
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#define ASAN_MORGUE_THRESHOLD 65536
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#define ASAN_TRACE_ITEMS 16
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#else
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// MODE=asan
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// O(32mb) of morgue memory
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// Θ(32) bytes of malloc overhead
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#define ASAN_MORGUE_ITEMS 512
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#define ASAN_MORGUE_THRESHOLD 65536
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#define ASAN_TRACE_ITEMS 4
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#endif
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#define SHADOW(x) ((signed char *)(((intptr_t)(x) >> kAsanScale) + kAsanMagic))
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#define UNSHADOW(x) ((void *)(MAX(0, (intptr_t)(x) - kAsanMagic) << kAsanScale))
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#define __asan_unreachable() \
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do { \
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kprintf("%s:%d: __asan_unreachable()\n", __FILE__, __LINE__); \
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__builtin_trap(); \
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} while (0)
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typedef void __asan_die_f(void);
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struct AsanFault {
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signed char kind;
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const signed char *shadow;
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};
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struct AsanTrace {
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uint32_t p[ASAN_TRACE_ITEMS]; // assumes linkage into 32-bit space
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};
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void __asan_unpoison(void *, long);
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void __asan_poison(void *, long, signed char);
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void __asan_verify(const void *, size_t);
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void __asan_verify_str(const char *);
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void __asan_map_shadow(uintptr_t, size_t);
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bool __asan_is_valid(const void *, long) nosideeffect;
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bool __asan_is_valid_str(const char *) nosideeffect;
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bool __asan_is_valid_strlist(char *const *) nosideeffect;
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bool __asan_is_valid_iov(const struct iovec *, int) nosideeffect;
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struct AsanFault __asan_check(const void *, long) nosideeffect;
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struct AsanFault __asan_check_str(const char *) nosideeffect;
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bool __asan_is_mapped(int);
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int __asan_is_leaky(void *);
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int __asan_print_trace(void *);
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__asan_die_f *__asan_die(void) __wur;
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void __asan_memset(void *, char, size_t);
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size_t __asan_get_heap_size(const void *);
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void *__asan_memcpy(void *, const void *, size_t);
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void __asan_rawtrace(struct AsanTrace *, const struct StackFrame *);
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void __asan_report_memory_origin(const unsigned char *, int, signed char);
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void __asan_report_memory_origin_image(intptr_t, int);
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void __asan_report_memory_origin_heap(const unsigned char *, int);
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_INTRIN_ASAN_H_ */
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