Maximum size that can be allocated
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Can I allocate more memory than VmallocTotal given in /proc/meminfo ?
linux memory
asked Mar 13 at 9:32
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Can I allocate more memory than VmallocTotal given in /proc/meminfo ?
linux memory
asked Mar 13 at 9:32
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Can I allocate more memory than VmallocTotal given in /proc/meminfo ?
linux memory
asked Mar 13 at 9:32
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Can I allocate more memory than VmallocTotal given in /proc/meminfo ?
linux memory
linux memory
asked Mar 13 at 9:32
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asked Mar 13 at 9:32
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asked Mar 13 at 9:32
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asked Mar 13 at 9:32
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asked Mar 13 at 9:32
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vmalloc() is an internal kernel function. It is not available to user programs. It has no effect on allocations of memory for user programs. VmallocTotal limits the allocations of kernel code which calls vmalloc() (and VmallocTotal does not change, either automatically or manually).
Maximum size of memory that can be "allocated" by user programs depends on overcommit settings. I write "allocated" in scare quotes, because "overcommit" somewhat contradicts the idea of "allocating memory". One explanation is here, you can search on the keywords it uses for other explanations: https://serverfault.com/questions/606185/how-does-vm-overcommit-memory-work
As the kernel doc puts it, system calls like mmap() or the old sbrk() do not allocate memory by default. They return "address space". Real memory will be mapped on-demand if/when it is written to. Memory is mapped in terms of pages (usually 4096 bytes).
answered Mar 13 at 11:11
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1 Answer
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1 Answer
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vmalloc() is an internal kernel function. It is not available to user programs. It has no effect on allocations of memory for user programs. VmallocTotal limits the allocations of kernel code which calls vmalloc() (and VmallocTotal does not change, either automatically or manually).
Maximum size of memory that can be "allocated" by user programs depends on overcommit settings. I write "allocated" in scare quotes, because "overcommit" somewhat contradicts the idea of "allocating memory". One explanation is here, you can search on the keywords it uses for other explanations: https://serverfault.com/questions/606185/how-does-vm-overcommit-memory-work
As the kernel doc puts it, system calls like mmap() or the old sbrk() do not allocate memory by default. They return "address space". Real memory will be mapped on-demand if/when it is written to. Memory is mapped in terms of pages (usually 4096 bytes).
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
add a comment |
vmalloc() is an internal kernel function. It is not available to user programs. It has no effect on allocations of memory for user programs. VmallocTotal limits the allocations of kernel code which calls vmalloc() (and VmallocTotal does not change, either automatically or manually).
Maximum size of memory that can be "allocated" by user programs depends on overcommit settings. I write "allocated" in scare quotes, because "overcommit" somewhat contradicts the idea of "allocating memory". One explanation is here, you can search on the keywords it uses for other explanations: https://serverfault.com/questions/606185/how-does-vm-overcommit-memory-work
As the kernel doc puts it, system calls like mmap() or the old sbrk() do not allocate memory by default. They return "address space". Real memory will be mapped on-demand if/when it is written to. Memory is mapped in terms of pages (usually 4096 bytes).
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
add a comment |
vmalloc() is an internal kernel function. It is not available to user programs. It has no effect on allocations of memory for user programs. VmallocTotal limits the allocations of kernel code which calls vmalloc() (and VmallocTotal does not change, either automatically or manually).
Maximum size of memory that can be "allocated" by user programs depends on overcommit settings. I write "allocated" in scare quotes, because "overcommit" somewhat contradicts the idea of "allocating memory". One explanation is here, you can search on the keywords it uses for other explanations: https://serverfault.com/questions/606185/how-does-vm-overcommit-memory-work
As the kernel doc puts it, system calls like mmap() or the old sbrk() do not allocate memory by default. They return "address space". Real memory will be mapped on-demand if/when it is written to. Memory is mapped in terms of pages (usually 4096 bytes).
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
vmalloc() is an internal kernel function. It is not available to user programs. It has no effect on allocations of memory for user programs. VmallocTotal limits the allocations of kernel code which calls vmalloc() (and VmallocTotal does not change, either automatically or manually).
Maximum size of memory that can be "allocated" by user programs depends on overcommit settings. I write "allocated" in scare quotes, because "overcommit" somewhat contradicts the idea of "allocating memory". One explanation is here, you can search on the keywords it uses for other explanations: https://serverfault.com/questions/606185/how-does-vm-overcommit-memory-work
As the kernel doc puts it, system calls like mmap() or the old sbrk() do not allocate memory by default. They return "address space". Real memory will be mapped on-demand if/when it is written to. Memory is mapped in terms of pages (usually 4096 bytes).
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
edited Mar 13 at 11:55
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
answered Mar 13 at 11:11
sourcejedisourcejedi
25.9k445113
25.9k445113
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