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| author | Kostya Kortchinsky <kostyak@google.com> | 2017-12-11 19:23:12 +0000 |
|---|---|---|
| committer | Kostya Kortchinsky <kostyak@google.com> | 2017-12-11 19:23:12 +0000 |
| commit | 313d4281293b9be28bc0a6af624c4729e4faae21 (patch) | |
| tree | 09b12b80ba7450cd7208acc6a7e912c82d5035a9 /lib/sanitizer_common/sanitizer_syscall_generic.inc | |
| parent | b3c6c0c00d983413de921cbf5a139f0c6edcc72c (diff) | |
[sanitizer] Introduce a vDSO aware time function, and use it in the allocator [redo]
Summary:
Redo of D40657, which had the initial discussion. The initial code had to move
into a libcdep file, and things had to be shuffled accordingly.
`NanoTime` is a time sink when checking whether or not to release memory to
the OS. While reducing the amount of calls to said function is in the works,
another solution that was found to be beneficial was to use a timing function
that can leverage the vDSO.
We hit a couple of snags along the way, like the fact that the glibc crashes
when clock_gettime is called from a preinit_array, or the fact that
`__vdso_clock_gettime` is mangled (for security purposes) and can't be used
directly, and also that clock_gettime can be intercepted.
The proposed solution takes care of all this as far as I can tell, and
significantly improve performances and some Scudo load tests with memory
reclaiming enabled.
@mcgrathr: please feel free to follow up on
https://reviews.llvm.org/D40657#940857 here. I posted a reply at
https://reviews.llvm.org/D40657#940974.
Reviewers: alekseyshl, krytarowski, flowerhack, mcgrathr, kubamracek
Reviewed By: alekseyshl, krytarowski
Subscribers: #sanitizers, mcgrathr, srhines, llvm-commits, kubamracek
Differential Revision: https://reviews.llvm.org/D40679
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@320409 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/sanitizer_common/sanitizer_syscall_generic.inc')
| -rw-r--r-- | lib/sanitizer_common/sanitizer_syscall_generic.inc | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_syscall_generic.inc b/lib/sanitizer_common/sanitizer_syscall_generic.inc index 138d5ca90..ccc6dc360 100644 --- a/lib/sanitizer_common/sanitizer_syscall_generic.inc +++ b/lib/sanitizer_common/sanitizer_syscall_generic.inc @@ -36,6 +36,7 @@ # define SYS_sigaltstack SYS___sigaltstack14 # define SYS_sigprocmask SYS___sigprocmask14 # define SYS_nanosleep SYS___nanosleep50 +# define SYS_clock_gettime SYS___clock_gettime50 # if SANITIZER_WORDSIZE == 64 # define internal_syscall_ptr __syscall # else |