Sebastiaan van Stijn ec79d0fc05 pkg/fileutils: GetTotalUsedFds(): use fast-path for Kernel 6.2 and up ... Linux 6.2 and up (commit [f1f1f2569901ec5b9d425f2e91c09a0e320768f3][1]) provides a fast path for the number of open files for the process. From the [Linux docs][2]: > The number of open files for the process is stored in 'size' member of > `stat()` output for /proc/<pid>/fd for fast access. [1]: f1f1f25699 [2]: https://docs.kernel.org/filesystems/proc.html#proc-pid-fd-list-of-symlinks-to-open-files This patch adds a fast-path for Kernels that support this, and falls back to the slow path if the Size fields is zero. Comparing on a Fedora 38 (kernel 6.2.9-300.fc38.x86_64): Before/After: go test -bench ^BenchmarkGetTotalUsedFds$ -run ^$ ./pkg/fileutils/ BenchmarkGetTotalUsedFds 57264 18595 ns/op 408 B/op 10 allocs/op BenchmarkGetTotalUsedFds 370392 3271 ns/op 40 B/op 3 allocs/op Note that the slow path has 1 more file-descriptor, due to the open file-handle for /proc/<pid>/fd during the calculation. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>		2023-06-30 01:31:58 +02:00
..
fileutils.go	pkg/fileutils: ReadSymlinkedDirectory: preserve underlying error	2022-10-16 20:15:08 +02:00
fileutils_darwin.go	Add canonical import comment	2018-02-05 16:51:57 -05:00
fileutils_linux.go	pkg/fileutils: GetTotalUsedFds(): use fast-path for Kernel 6.2 and up	2023-06-30 01:31:58 +02:00
fileutils_test.go	pkg/fileutils: add BenchmarkGetTotalUsedFds	2023-06-30 01:31:57 +02:00
fileutils_windows.go	Add canonical import comment	2018-02-05 16:51:57 -05:00