library: address remaining cpu distortions, <stat> api

Signed-off-by: Liu Chao <liuchao173@huawei.com>
(cherry picked from commit c0c3b00182474729dd198a39b6d05442ed9c0e62)

backport-library-address-remaining-cpu-distortions-stat-api.patch

@@ -0,0 +1,79 @@
+From 6418b8c1fbcfdcda4cad8efacccceb7bcdbb1de9 Mon Sep 17 00:00:00 2001
+From: Jim Warner <james.warner@comcast.net>
+Date: Wed, 20 Mar 2024 00:00:00 -0500
+Subject: [PATCH] library: address remaining cpu distortions, <stat> api
+
+When the potential cpu distortion was addressed in the
+commit referenced below, the revision did not quite go
+far enough.  This was revealed in the merge plus issue
+posts also shown. Thus a need for this final solution.
+
+[ and now that all the stat_jifs fields are verified ]
+[ that TICsetH macro need not check for distortions. ]
+
+Reference(s):
+https://gitlab.com/procps-ng/procps/-/merge_requests/223
+https://gitlab.com/procps-ng/procps/-/issues/321
+
+. Mar, 2017 - cpu distorions relocated/improved
+commit 253ac7f709412a8699767bd70faeaf98e19614f0
+
+Discovered-by: Chao Liu SuperSix173 <liuchao173@huawei.com>
+Signed-off-by: Jim Warner <james.warner@comcast.net>
+---
+ library/stat.c | 24 +++++++++++++++---------
+ 1 file changed, 15 insertions(+), 9 deletions(-)
+
+diff --git a/library/stat.c b/library/stat.c
+index c37e9b54..b04fe0a5 100644
+--- a/library/stat.c
++++ b/library/stat.c
+@@ -182,9 +182,10 @@ struct stat_info {
+ #define SYS_set(e,t,x) setDECL(e) { \
+     (void)T; R->result. t = S->new. x; }
+ // delta assignment
++// ( thanks to 'stat_derive_unique', this macro no longer needs to )
++// ( protect against a negative value when a cpu is brought online )
+ #define TICsetH(e,t,x) setDECL(e) { \
+-    (void)S; R->result. t = ( T->new. x - T->old. x ); \
+-    if (R->result. t < 0) R->result. t = 0; }
++    (void)S; R->result. t = ( T->new. x - T->old. x ); }
+ #define SYSsetH(e,t,x) setDECL(e) { \
+     (void)T; R->result. t = ( S->new. x - S->old. x ); }
+ 
+@@ -555,6 +556,9 @@ wrap_up:
+ static inline void stat_derive_unique (
+         struct hist_tic *this)
+ {
++    unsigned long long *new, *old;
++    int i;
++
+     /* note: we calculate these derived values in a manner consistent with
+              the calculations for cgroup accounting, as nearly as possible
+        ( see linux sources: ./kernel/cgroup/rstat.c, root_cgroup_cputime ) */
+@@ -576,13 +580,15 @@ static inline void stat_derive_unique (
+     this->new.xbsy
+         = this->new.xtot - this->new.xidl;
+ 
+-    // don't distort deltas when cpus are taken offline or brought online
+-    if (this->new.xusr < this->old.xusr
+-    || (this->new.xsys < this->old.xsys)
+-    || (this->new.xidl < this->old.xidl)
+-    || (this->new.xbsy < this->old.xbsy)
+-    || (this->new.xtot < this->old.xtot))
+-        memcpy(&this->old, &this->new, sizeof(struct stat_jifs));
++    // don't distort results when cpus are brought back online
++    new = (unsigned long long *)&this->new;
++    old = (unsigned long long *)&this->old;
++    for (i = 0; i < sizeof(struct stat_jifs) / sizeof(unsigned long long); i++) {
++        if (*(new++) < *(old++)) {
++            memcpy(&this->old, &this->new, sizeof(struct stat_jifs));
++            break;
++        }
++    }
+ } // end: stat_derive_unique
+ 
+ 
+-- 
+2.33.0
+

procps-ng.spec

@@ -1,6 +1,6 @@
 Name: 		procps-ng
 Version: 	4.0.4
-Release:	1
+Release:	2
 Summary: 	Utilities that provide system information.
 License: 	GPL+ and GPLv2 and GPLv2+ and GPLv3+ and LGPLv2+
 URL: 		https://sourceforge.net/projects/procps-ng/
@@ -11,6 +11,7 @@ Source2: 	README.top
 
 Patch1: 	openeuler-add-M-and-N-options-for-top.patch
 Patch2: 	openeuler-top-exit-with-error-when-pid-overflow.patch
+Patch3:		backport-library-address-remaining-cpu-distortions-stat-api.patch
 
 BuildRequires: 	ncurses-devel libtool autoconf automake gcc gettext-devel systemd-devel
 
@@ -93,6 +94,9 @@ ln -s %{_bindir}/pidof %{buildroot}%{_sbindir}/pidof
 %{_mandir}/man*
 
 %changelog
+* Tue Apr 02 2024 Liu Chao <liuchao173@huawei.com> - 4.0.4-2
+- library: address remaining cpu distortions, <stat> api
+
 * Wed Nov 01 2023 liweigang <weigangli99@gmail.com> - 4.0.4-1
 - update to version v4.0.4