Messages in this thread | | | Date | Thu, 25 Apr 2019 15:06:52 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] fs/proc: add VmTaskSize field to /proc/$$/status |
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On Thu, 25 Apr 2019 16:57:47 -0400 Joel Savitz <jsavitz@redhat.com> wrote:
> Currently, there is no fast mechanism to get the virtual memory size of > the current process from userspace. This information is available to the > user through several means, one being a linear search of the entire address > space. This is the method used by a component of the libhugetlb kernel > test, and using the mechanism proposed in this patch, the time complexity > of that test would be upgraded to constant time from linear time. This is > especially relevant on 64-bit architechtures where a linear search of > the address space could take an absurd amount of time. Using this > mechanism, the modification to the test component would be portable > across all architechtures.
Please include all details on the observed performance improvements.
> fs/proc/task_mmu.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-)
Please update Documentation/filesystems/proc.txt.
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