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Kernel: Better handling of allocation failure in profiling

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If we can't allocate a PerformanceEventBuffer to store the profiling
events, we now fail sys$profiling_enable() and sys$perf_event()
with ENOMEM instead of carrying on with a broken buffer.
This commit is contained in:
Andreas Kling 2021-03-02 16:55:54 +01:00
parent e7ef729db3
commit b425c2602c
6 changed files with 26 additions and 18 deletions
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12
Kernel/PerformanceEventBuffer.cpp
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@ -34,8 +34,8 @@
namespace Kernel {
PerformanceEventBuffer::PerformanceEventBuffer()
: m_buffer(KBuffer::try_create_with_size(4 * MiB, Region::Access::Read | Region::Access::Write, "Performance events", AllocationStrategy::AllocateNow))
PerformanceEventBuffer::PerformanceEventBuffer(NonnullOwnPtr<KBuffer> buffer)
: m_buffer(move(buffer))
{
}
@ -171,4 +171,12 @@ bool PerformanceEventBuffer::to_json(KBufferBuilder& builder, ProcessID pid, con
return true;
}
OwnPtr<PerformanceEventBuffer> PerformanceEventBuffer::try_create_with_size(size_t buffer_size)
{
auto buffer = KBuffer::try_create_with_size(buffer_size, Region::Access::Read | Region::Access::Write, "Performance events", AllocationStrategy::AllocateNow);
if (!buffer)
return {};
return adopt_own(*new PerformanceEventBuffer(buffer.release_nonnull()));
}
}