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Diffstat (limited to 'include/llfio/v2.0/utils.hpp')
| -rw-r--r-- | include/llfio/v2.0/utils.hpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/llfio/v2.0/utils.hpp b/include/llfio/v2.0/utils.hpp index 1877d43a..147dfc7b 100644 --- a/include/llfio/v2.0/utils.hpp +++ b/include/llfio/v2.0/utils.hpp @@ -236,6 +236,14 @@ namespace utils cannot distinguish between regions with the accounted flag enabled or disabled. By default, this fast path is enabled. + \note `/proc/pid/smaps_rollup` was added in Linux kernel 3.16, so the default specifying + `process_memory_usage::want::private_committed_inaccurate` will always fail on Linux + kernels preceding that with an error code comparing equal to `errc::operation_not_supported`. + As one would assume users would prefer this operation to fail on older kernels rather than + silently go slowly in complex memory spaces, it is left opt-in to request + the accurate implementation which works on older Linux kernels. Or, just don't request + `private_committed` at all, and pretend `private_paged_in` means the same thing. + \note Mac OS provides no way of reading how much memory a process has committed. We therefore supply as `private_committed` the same value as `private_paged_in`. */ |