58f2656d7e
Summary: This implements an opportunistic check for the RSS limit. For ASan, this was implemented thanks to a background thread checking the current RSS vs the set limit every 100ms. This was deemed problematic for Scudo due to potential Android concerns (Zygote as pointed out by Aleksey) as well as the general inconvenience of having a permanent background thread. If a limit (soft or hard) is specified, we will attempt to update the RSS limit status (exceeded or not) every 100ms. This is done in an opportunistic way: if we can update it, we do it, if not we return the current status, mostly because we don't need it to be fully consistent (it's done every 100ms anyway). If the limit is exceeded `allocate` will act as if OOM for a soft limit, or just die for a hard limit. We use the `common_flags()`'s `hard_rss_limit_mb` & `soft_rss_limit_mb` for configuration of the limits. Reviewers: alekseyshl Reviewed By: alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D40038 llvm-svn: 318301
57 lines
3.1 KiB
C
57 lines
3.1 KiB
C
// RUN: %clang_scudo %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit
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// RUN: %env_scudo_opts="soft_rss_limit_mb=256" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit
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// RUN: %env_scudo_opts="hard_rss_limit_mb=256" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit
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// RUN: %env_scudo_opts="soft_rss_limit_mb=64:allocator_may_return_null=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit
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// RUN: %env_scudo_opts="soft_rss_limit_mb=64:allocator_may_return_null=1" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit-returnnull
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// RUN: %env_scudo_opts="soft_rss_limit_mb=64:allocator_may_return_null=0:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit
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// RUN: %env_scudo_opts="soft_rss_limit_mb=64:allocator_may_return_null=1:can_use_proc_maps_statm=0" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit-returnnull
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// RUN: %env_scudo_opts="hard_rss_limit_mb=64:allocator_may_return_null=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit
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// RUN: %env_scudo_opts="hard_rss_limit_mb=64:allocator_may_return_null=1" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit
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// RUN: %env_scudo_opts="hard_rss_limit_mb=64:allocator_may_return_null=0:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit
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// RUN: %env_scudo_opts="hard_rss_limit_mb=64:allocator_may_return_null=1:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit
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// Tests that the soft and hard RSS limits work as intended. Without limit or
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// with a high limit, the test should pass without any malloc returning NULL or
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// the program dying.
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// If a limit is specified, it should return some NULL or die depending on
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// allocator_may_return_null. This should also work without statm.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static const size_t kNumAllocs = 128;
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static const size_t kAllocSize = 1 << 20; // 1MB.
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static void *allocs[kNumAllocs];
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int main(int argc, char *argv[]) {
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int returned_null = 0;
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for (int i = 0; i < kNumAllocs; i++) {
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if ((i & 0xf) == 0)
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usleep(50000);
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allocs[i] = malloc(kAllocSize);
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if (allocs[i])
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memset(allocs[i], 0xff, kAllocSize); // Dirty the pages.
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else
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returned_null++;
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}
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for (int i = 0; i < kNumAllocs; i++)
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free(allocs[i]);
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if (returned_null == 0)
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printf("All malloc calls succeeded\n");
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else
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printf("%d malloc calls returned NULL\n", returned_null);
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return 0;
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}
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// CHECK-nolimit: All malloc calls succeeded
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// CHECK-softlimit: soft RSS limit exhausted
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// CHECK-softlimit-NOT: malloc calls
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// CHECK-softlimit-returnnull: soft RSS limit exhausted
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// CHECK-softlimit-returnnull: malloc calls returned NULL
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// CHECK-hardlimit: hard RSS limit exhausted
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// CHECK-hardlimit-NOT: malloc calls
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