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Merge pull request #10550 from kkoniuszy/linux-map-buildup-fix

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host_memory: merge adjacent placeholder mappings on Linux
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bunnei 2023-06-03 23:22:24 -07:00 committed by GitHub
commit c5782150f0
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1 changed files with 22 additions and 0 deletions
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22
src/common/host_memory.cpp
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@ -14,6 +14,7 @@
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <boost/icl/interval_set.hpp>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
@ -415,6 +416,7 @@ public:
madvise(virtual_base, virtual_size, MADV_HUGEPAGE);
#endif
placeholders.add({0, virtual_size});
good = true;
}
@ -423,6 +425,10 @@ public:
}
void Map(size_t virtual_offset, size_t host_offset, size_t length) {
{
std::scoped_lock lock{placeholder_mutex};
placeholders.subtract({virtual_offset, virtual_offset + length});
}
void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, fd, host_offset);
@ -433,6 +439,19 @@ public:
// The method name is wrong. We're still talking about the virtual range.
// We don't want to unmap, we want to reserve this memory.
{
std::scoped_lock lock{placeholder_mutex};
auto it = placeholders.find({virtual_offset - 1, virtual_offset + length + 1});
if (it != placeholders.end()) {
size_t prev_upper = virtual_offset + length;
virtual_offset = std::min(virtual_offset, it->lower());
length = std::max(it->upper(), prev_upper) - virtual_offset;
}
placeholders.add({virtual_offset, virtual_offset + length});
}
void* ret = mmap(virtual_base + virtual_offset, length, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
@ -476,6 +495,9 @@ private:
}
int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
boost::icl::interval_set<size_t> placeholders; ///< Mapped placeholders
std::mutex placeholder_mutex; ///< Mutex for placeholders
};
#else // ^^^ Linux ^^^ vvv Generic vvv