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Merge pull request #10550 from kkoniuszy/linux-map-buildup-fix
host_memory: merge adjacent placeholder mappings on Linux
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commit
c5782150f0
@ -14,6 +14,7 @@
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <boost/icl/interval_set.hpp>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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@ -415,6 +416,7 @@ public:
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madvise(virtual_base, virtual_size, MADV_HUGEPAGE);
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#endif
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placeholders.add({0, virtual_size});
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good = true;
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}
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@ -423,6 +425,10 @@ public:
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}
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void Map(size_t virtual_offset, size_t host_offset, size_t length) {
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{
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std::scoped_lock lock{placeholder_mutex};
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placeholders.subtract({virtual_offset, virtual_offset + length});
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}
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void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_FIXED, fd, host_offset);
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@ -433,6 +439,19 @@ public:
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// The method name is wrong. We're still talking about the virtual range.
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// We don't want to unmap, we want to reserve this memory.
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{
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std::scoped_lock lock{placeholder_mutex};
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auto it = placeholders.find({virtual_offset - 1, virtual_offset + length + 1});
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if (it != placeholders.end()) {
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size_t prev_upper = virtual_offset + length;
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virtual_offset = std::min(virtual_offset, it->lower());
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length = std::max(it->upper(), prev_upper) - virtual_offset;
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}
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placeholders.add({virtual_offset, virtual_offset + length});
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}
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void* ret = mmap(virtual_base + virtual_offset, length, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
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@ -476,6 +495,9 @@ private:
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}
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int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
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boost::icl::interval_set<size_t> placeholders; ///< Mapped placeholders
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std::mutex placeholder_mutex; ///< Mutex for placeholders
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};
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#else // ^^^ Linux ^^^ vvv Generic vvv
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