Problem ======== commit 658eb5ab916d ("delayacct: add delay max to record delay peak") - adding more fields commit f65c64f311ee ("delayacct: add delay min to record delay peak") - adding more fields commit b016d0873777 ("taskstats: modify taskstats version") - version bump to 15 Since version 15 (TASKSTATS_VERSION=15) the new layout of the structure adds fields in the middle of the structure, rendering all old software incompatible with newer kernels and software compiled against the new kernel headers incompatible with older kernels. Solution ========= move delay max and delay min to the end of taskstat, and bump the version to 16 after the change [wang.yaxin@zte.com.cn: adjust indentation] Link: https://lkml.kernel.org/r/202505192131489882NSciXV4EGd8zzjLuwoOK@zte.com.cn Link: https://lkml.kernel.org/r/20250510155413259V4JNRXxukdDgzsaL0Fo6a@zte.com.cn Fixes: f65c64f311ee ("delayacct: add delay min to record delay peak") Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn> Signed-off-by: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Kun Jiang <jiang.kun2@zte.com.cn> Reviewed-by: Yang Yang <yang.yang29@zte.com.cn> Cc: Balbir Singh <bsingharora@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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| @@ -34,7 +34,7 @@ · 33 unmodified lines | ||
| 34 | 34 | */ |
| 35 | 35 | |
| 36 | 36 | |
| 37 | −#define TASKSTATS_VERSION 15 | |
| 37 | +#define TASKSTATS_VERSION 16 | |
| 38 | 38 | #define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN |
| 39 | 39 | * in linux/sched.h */ |
| 40 | 40 | |
| @@ -72,8 +72,6 @@ struct taskstats { · 31 unmodified lines | ||
| 72 | 72 | */ |
| 73 | 73 | __u64 cpu_count __attribute__((aligned(8))); |
| 74 | 74 | __u64 cpu_delay_total; |
| 75 | − __u64 cpu_delay_max; | |
| 76 | − __u64 cpu_delay_min; | |
| 77 | 75 | |
| 78 | 76 | /* Following four fields atomically updated using task->delays->lock */ |
| 79 | 77 | |
| @@ -82,14 +80,10 @@ struct taskstats { · 2 unmodified lines | ||
| 82 | 80 | */ |
| 83 | 81 | __u64 blkio_count; |
| 84 | 82 | __u64 blkio_delay_total; |
| 85 | − __u64 blkio_delay_max; | |
| 86 | − __u64 blkio_delay_min; | |
| 87 | 83 | |
| 88 | 84 | /* Delay waiting for page fault I/O (swap in only) */ |
| 89 | 85 | __u64 swapin_count; |
| 90 | 86 | __u64 swapin_delay_total; |
| 91 | − __u64 swapin_delay_max; | |
| 92 | − __u64 swapin_delay_min; | |
| 93 | 87 | |
| 94 | 88 | /* cpu "wall-clock" running time |
| 95 | 89 | * On some architectures, value will adjust for cpu time stolen |
| @@ -172,14 +166,11 @@ struct taskstats { · 76 unmodified lines | ||
| 172 | 166 | /* Delay waiting for memory reclaim */ |
| 173 | 167 | __u64 freepages_count; |
| 174 | 168 | __u64 freepages_delay_total; |
| 175 | − __u64 freepages_delay_max; | |
| 176 | − __u64 freepages_delay_min; | |
| 169 | + | |
| 177 | 170 | |
| 178 | 171 | /* Delay waiting for thrashing page */ |
| 179 | 172 | __u64 thrashing_count; |
| 180 | 173 | __u64 thrashing_delay_total; |
| 181 | − __u64 thrashing_delay_max; | |
| 182 | − __u64 thrashing_delay_min; | |
| 183 | 174 | |
| 184 | 175 | /* v10: 64-bit btime to avoid overflow */ |
| 185 | 176 | __u64 ac_btime64; /* 64-bit begin time */ |
| @@ -187,8 +178,6 @@ struct taskstats { · 1 unmodified line | ||
| 187 | 178 | /* v11: Delay waiting for memory compact */ |
| 188 | 179 | __u64 compact_count; |
| 189 | 180 | __u64 compact_delay_total; |
| 190 | − __u64 compact_delay_max; | |
| 191 | − __u64 compact_delay_min; | |
| 192 | 181 | |
| 193 | 182 | /* v12 begin */ |
| 194 | 183 | __u32 ac_tgid; /* thread group ID */ |
| @@ -210,15 +199,37 @@ struct taskstats { · 15 unmodified lines | ||
| 210 | 199 | /* v13: Delay waiting for write-protect copy */ |
| 211 | 200 | __u64 wpcopy_count; |
| 212 | 201 | __u64 wpcopy_delay_total; |
| 213 | − __u64 wpcopy_delay_max; | |
| 214 | − __u64 wpcopy_delay_min; | |
| 215 | 202 | |
| 216 | 203 | /* v14: Delay waiting for IRQ/SOFTIRQ */ |
| 217 | 204 | __u64 irq_count; |
| 218 | 205 | __u64 irq_delay_total; |
| 219 | − __u64 irq_delay_max; | |
| 220 | − __u64 irq_delay_min; | |
| 221 | − /* v15: add Delay max */ | |
| 206 | + | |
| 207 | + /* v15: add Delay max and Delay min */ | |
| 208 | + | |
| 209 | + /* v16: move Delay max and Delay min to the end of taskstat */ | |
| 210 | + __u64 cpu_delay_max; | |
| 211 | + __u64 cpu_delay_min; | |
| 212 | + | |
| 213 | + __u64 blkio_delay_max; | |
| 214 | + __u64 blkio_delay_min; | |
| 215 | + | |
| 216 | + __u64 swapin_delay_max; | |
| 217 | + __u64 swapin_delay_min; | |
| 218 | + | |
| 219 | + __u64 freepages_delay_max; | |
| 220 | + __u64 freepages_delay_min; | |
| 221 | + | |
| 222 | + __u64 thrashing_delay_max; | |
| 223 | + __u64 thrashing_delay_min; | |
| 224 | + | |
| 225 | + __u64 compact_delay_max; | |
| 226 | + __u64 compact_delay_min; | |
| 227 | + | |
| 228 | + __u64 wpcopy_delay_max; | |
| 229 | + __u64 wpcopy_delay_min; | |
| 230 | + | |
| 231 | + __u64 irq_delay_max; | |
| 232 | + __u64 irq_delay_min; | |
| 222 | 233 | }; |
| 223 | 234 | |
| 224 | 235 | |