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author | Kostya Kortchinsky <kostyak@google.com> | 2019-01-24 15:56:54 +0000 |
---|---|---|
committer | Kostya Kortchinsky <kostyak@google.com> | 2019-01-24 15:56:54 +0000 |
commit | d6524c124d8b3cabdeb3046224f30a263d4eab9f (patch) | |
tree | bf3df1e9dd41c2369c0b66da1ed1164e53666c63 | |
parent | ab0b288c15a6f25511de0606b85f4e44a97f74db (diff) |
[scudo] Tuning changes based on feedback from current use
Summary:
This tunes several of the default parameters used within the allocator:
- disable the deallocation type mismatch on Android by default; this
was causing too many issues with third party libraries;
- change the default `SizeClassMap` to `Dense`, it caches less entries
and is way more memory efficient overall;
- relax the timing of the RSS checks, 10 times per second was too much,
lower it to 4 times (every 250ms), and update the test so that it
passes with the new default.
Reviewers: eugenis
Reviewed By: eugenis
Subscribers: srhines, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D57116
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@352057 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/scudo/scudo_allocator.cpp | 4 | ||||
-rw-r--r-- | lib/scudo/scudo_flags.inc | 4 | ||||
-rw-r--r-- | lib/scudo/scudo_platform.h | 2 | ||||
-rw-r--r-- | test/scudo/rss.c | 24 |
4 files changed, 18 insertions, 16 deletions
diff --git a/lib/scudo/scudo_allocator.cpp b/lib/scudo/scudo_allocator.cpp index 442166726..172975eb9 100644 --- a/lib/scudo/scudo_allocator.cpp +++ b/lib/scudo/scudo_allocator.cpp @@ -587,11 +587,11 @@ NOINLINE void Allocator::performSanityChecks() { } // Opportunistic RSS limit check. This will update the RSS limit status, if -// it can, every 100ms, otherwise it will just return the current one. +// it can, every 250ms, otherwise it will just return the current one. NOINLINE bool Allocator::isRssLimitExceeded() { u64 LastCheck = atomic_load_relaxed(&RssLastCheckedAtNS); const u64 CurrentCheck = MonotonicNanoTime(); - if (LIKELY(CurrentCheck < LastCheck + (100ULL * 1000000ULL))) + if (LIKELY(CurrentCheck < LastCheck + (250ULL * 1000000ULL))) return atomic_load_relaxed(&RssLimitExceeded); if (!atomic_compare_exchange_weak(&RssLastCheckedAtNS, &LastCheck, CurrentCheck, memory_order_relaxed)) diff --git a/lib/scudo/scudo_flags.inc b/lib/scudo/scudo_flags.inc index 6dffcbaa5..c124738c1 100644 --- a/lib/scudo/scudo_flags.inc +++ b/lib/scudo/scudo_flags.inc @@ -36,7 +36,9 @@ SCUDO_FLAG(int, QuarantineChunksUpToSize, -1, "Size in bytes up to which chunks will be quarantined (if lower than" "or equal to). Defaults to 256 (32-bit) or 2048 (64-bit)") -SCUDO_FLAG(bool, DeallocationTypeMismatch, true, +// Disable the deallocation type check by default on Android, it causes too many +// issues with third party libraries. +SCUDO_FLAG(bool, DeallocationTypeMismatch, !SANITIZER_ANDROID, "Report errors on malloc/delete, new/free, new/delete[], etc.") SCUDO_FLAG(bool, DeleteSizeMismatch, true, diff --git a/lib/scudo/scudo_platform.h b/lib/scudo/scudo_platform.h index d6e2001f3..07d4b70fc 100644 --- a/lib/scudo/scudo_platform.h +++ b/lib/scudo/scudo_platform.h @@ -79,7 +79,7 @@ const uptr RegionSizeLog = SANITIZER_ANDROID ? 19 : 20; #endif // SANITIZER_CAN_USE_ALLOCATOR64 #if !defined(SCUDO_SIZE_CLASS_MAP) -# define SCUDO_SIZE_CLASS_MAP Default +# define SCUDO_SIZE_CLASS_MAP Dense #endif #define SIZE_CLASS_MAP_TYPE SIZE_CLASS_MAP_TYPE_(SCUDO_SIZE_CLASS_MAP) diff --git a/test/scudo/rss.c b/test/scudo/rss.c index 4376290ad..f98bf9536 100644 --- a/test/scudo/rss.c +++ b/test/scudo/rss.c @@ -1,15 +1,15 @@ // RUN: %clang_scudo %s -o %t // RUN: %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit -// RUN: %env_scudo_opts="soft_rss_limit_mb=256" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit -// RUN: %env_scudo_opts="hard_rss_limit_mb=256" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit -// 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 -// 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 -// 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 -// 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 -// 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 -// 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 -// 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 -// 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 +// RUN: %env_scudo_opts="soft_rss_limit_mb=128" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit +// RUN: %env_scudo_opts="hard_rss_limit_mb=128" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-nolimit +// RUN: %env_scudo_opts="soft_rss_limit_mb=32:allocator_may_return_null=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit +// RUN: %env_scudo_opts="soft_rss_limit_mb=32:allocator_may_return_null=1" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit-returnnull +// RUN: %env_scudo_opts="soft_rss_limit_mb=32:allocator_may_return_null=0:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit +// RUN: %env_scudo_opts="soft_rss_limit_mb=32:allocator_may_return_null=1:can_use_proc_maps_statm=0" %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-softlimit-returnnull +// RUN: %env_scudo_opts="hard_rss_limit_mb=32:allocator_may_return_null=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit +// RUN: %env_scudo_opts="hard_rss_limit_mb=32:allocator_may_return_null=1" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit +// RUN: %env_scudo_opts="hard_rss_limit_mb=32:allocator_may_return_null=0:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit +// RUN: %env_scudo_opts="hard_rss_limit_mb=32:allocator_may_return_null=1:can_use_proc_maps_statm=0" not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-hardlimit // Tests that the soft and hard RSS limits work as intended. Without limit or // with a high limit, the test should pass without any malloc returning NULL or @@ -22,7 +22,7 @@ #include <string.h> #include <unistd.h> -static const size_t kNumAllocs = 128; +static const size_t kNumAllocs = 64; static const size_t kAllocSize = 1 << 20; // 1MB. static void *allocs[kNumAllocs]; @@ -31,7 +31,7 @@ int main(int argc, char *argv[]) { int returned_null = 0; for (int i = 0; i < kNumAllocs; i++) { if ((i & 0xf) == 0) - usleep(50000); + usleep(100000); allocs[i] = malloc(kAllocSize); if (allocs[i]) memset(allocs[i], 0xff, kAllocSize); // Dirty the pages. |