From 1d9f0b6d889086ed54c549c152320780d967e5b0 Mon Sep 17 00:00:00 2001 From: Mauri de Souza Meneguzzo Date: Sun, 8 Oct 2023 19:31:36 +0000 Subject: [PATCH] unix: add linux cachestat system call The cachestat system call is an alternative to mincore that offers more extensive page cache statistics, aiming to enhance scalability. It was added on Linux 6.5. Fixes golang/go#61917 Change-Id: If1b6b96f859dd6bf09f1a0c048abfa743a42c540 GitHub-Last-Rev: d18fbb9c48348e5f1f663395647a9ca89a578f60 GitHub-Pull-Request: golang/sys#176 Reviewed-on: https://go-review.googlesource.com/c/sys/+/533242 Reviewed-by: Ian Lance Taylor Reviewed-by: Dmitri Shuralyov Auto-Submit: Ian Lance Taylor LUCI-TryBot-Result: Go LUCI --- unix/linux/types.go | 17 +++++++++++++++++ unix/syscall_linux.go | 2 ++ unix/zsyscall_linux.go | 10 ++++++++++ unix/ztypes_linux.go | 12 ++++++++++++ 4 files changed, 41 insertions(+) diff --git a/unix/linux/types.go b/unix/linux/types.go index 389eed4bd..f5a6ae9e7 100644 --- a/unix/linux/types.go +++ b/unix/linux/types.go @@ -461,6 +461,20 @@ struct my_can_bittiming_const { struct riscv_hwprobe {}; #endif + +// copied from /usr/include/uapi/linux/mman.h +struct cachestat_range { + __u64 off; + __u64 len; +}; + +struct cachestat { + __u64 nr_cache; + __u64 nr_dirty; + __u64 nr_writeback; + __u64 nr_evicted; + __u64 nr_recently_evicted; +}; */ import "C" @@ -5813,3 +5827,6 @@ const ( type SchedAttr C.struct_sched_attr const SizeofSchedAttr = C.sizeof_struct_sched_attr + +type Cachestat_t C.struct_cachestat +type CachestatRange C.struct_cachestat_range diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go index fb4e50224..6b8a4ad69 100644 --- a/unix/syscall_linux.go +++ b/unix/syscall_linux.go @@ -2482,3 +2482,5 @@ func SchedGetAttr(pid int, flags uint) (*SchedAttr, error) { } return attr, nil } + +//sys Cachestat(fd uint, crange *CachestatRange, cstat *Cachestat_t, flags uint) (err error) diff --git a/unix/zsyscall_linux.go b/unix/zsyscall_linux.go index 1ff3aec74..863d7dde2 100644 --- a/unix/zsyscall_linux.go +++ b/unix/zsyscall_linux.go @@ -2195,3 +2195,13 @@ func schedGetattr(pid int, attr *SchedAttr, size uint, flags uint) (err error) { } return } + +// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT + +func Cachestat(fd uint, crange *CachestatRange, cstat *Cachestat_t, flags uint) (err error) { + _, _, e1 := Syscall6(SYS_CACHESTAT, uintptr(fd), uintptr(unsafe.Pointer(crange)), uintptr(unsafe.Pointer(cstat)), uintptr(flags), 0, 0) + if e1 != 0 { + err = errnoErr(e1) + } + return +} diff --git a/unix/ztypes_linux.go b/unix/ztypes_linux.go index 18aa70b42..cdba4c77d 100644 --- a/unix/ztypes_linux.go +++ b/unix/ztypes_linux.go @@ -5883,3 +5883,15 @@ type SchedAttr struct { } const SizeofSchedAttr = 0x38 + +type Cachestat_t struct { + Cache uint64 + Dirty uint64 + Writeback uint64 + Evicted uint64 + Recently_evicted uint64 +} +type CachestatRange struct { + Off uint64 + Len uint64 +}