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Message-ID: <202509070012527934u0ySb3teQ4gOYKnocyNO@zte.com.cn>
Date: Sun, 7 Sep 2025 00:12:52 +0800 (CST)
From: <fan.yu9@....com.cn>
To: <akpm@...ux-foundation.org>, <wang.yaxin@....com.cn>, <corbet@....net>
Cc: <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<xu.xin16@....com.cn>, <yang.yang29@....com.cn>
Subject: [PATCHv2 linux-next 2/5] tools/delaytop: add memory verbose mode support
From: Fan Yu <fan.yu9@....com.cn>
The original delaytop tool always displayed detailed memory
subsystem breakdown, which could be overwhelming for users
who only need high-level overview.
Add flexible display control allowing users to choose their
preferred information granularity.
The new flexibility provides:
1) For quick monitoring: use normal mode to reduce visual clutter
2) For deep analysis: use verbose mode to see all memory subsystem details
Signed-off-by: Fan Yu <fan.yu9@....com.cn>
---
tools/accounting/delaytop.c | 128 +++++++++++++++++++++++++++---------
1 file changed, 98 insertions(+), 30 deletions(-)
diff --git a/tools/accounting/delaytop.c b/tools/accounting/delaytop.c
index 52718714496b..30dc95fb531a 100644
--- a/tools/accounting/delaytop.c
+++ b/tools/accounting/delaytop.c
@@ -69,13 +69,22 @@
int ret = fprintf(stream, fmt, ##__VA_ARGS__); \
ret >= 0; \
})
+#define TASK_AVG(task, field) average_ms((task).field##_delay_total, (task).field##_count)
#define PSI_LINE_FORMAT "%-12s %6.1f%%/%6.1f%%/%6.1f%%/%8llu(ms)\n"
-#define SORT_FIELD(name) \
+#define DELAY_FMT_DEFAULT "%8.2f %8.2f %8.2f %8.2f\n"
+#define DELAY_FMT_MEMVERBOSE "%8.2f %8.2f %8.2f %8.2f %8.2f %8.2f\n"
+#define SORT_FIELD(name, modes) \
{#name, \
offsetof(struct task_info, name##_delay_total), \
- offsetof(struct task_info, name##_count)}
+ offsetof(struct task_info, name##_count), \
+ modes}
#define END_FIELD {NULL, 0, 0}
+/* Display mode types */
+#define MODE_TYPE_ALL (0xFFFFFFFF)
+#define MODE_DEFAULT (1 << 0)
+#define MODE_MEMVERBOSE (1 << 1)
+
/* PSI statistics structure */
struct psi_stats {
double cpu_some_avg10, cpu_some_avg60, cpu_some_avg300;
@@ -115,6 +124,8 @@ struct task_info {
unsigned long long wpcopy_delay_total;
unsigned long long irq_count;
unsigned long long irq_delay_total;
+ unsigned long long mem_count;
+ unsigned long long mem_delay_total;
};
/* Container statistics structure */
@@ -131,6 +142,7 @@ struct field_desc {
const char *name; /* Field name for cmdline argument */
unsigned long total_offset; /* Offset of total delay in task_info */
unsigned long count_offset; /* Offset of count in task_info */
+ size_t supported_modes; /* Supported display modes */
};
/* Program settings structure */
@@ -142,6 +154,7 @@ struct config {
int monitor_pid; /* Monitor specific PID */
char *container_path; /* Path to container cgroup */
const struct field_desc *sort_field; /* Current sort field */
+ size_t display_mode; /* Current display mode */
};
/* Global variables */
@@ -152,14 +165,15 @@ static int task_count;
static int running = 1;
static struct container_stats container_stats;
static const struct field_desc sort_fields[] = {
- SORT_FIELD(cpu),
- SORT_FIELD(blkio),
- SORT_FIELD(irq),
- SORT_FIELD(swapin),
- SORT_FIELD(freepages),
- SORT_FIELD(thrashing),
- SORT_FIELD(compact),
- SORT_FIELD(wpcopy),
+ SORT_FIELD(cpu, MODE_DEFAULT),
+ SORT_FIELD(blkio, MODE_DEFAULT),
+ SORT_FIELD(irq, MODE_DEFAULT),
+ SORT_FIELD(mem, MODE_DEFAULT | MODE_MEMVERBOSE),
+ SORT_FIELD(swapin, MODE_MEMVERBOSE),
+ SORT_FIELD(freepages, MODE_MEMVERBOSE),
+ SORT_FIELD(thrashing, MODE_MEMVERBOSE),
+ SORT_FIELD(compact, MODE_MEMVERBOSE),
+ SORT_FIELD(wpcopy, MODE_MEMVERBOSE),
END_FIELD
};
@@ -207,7 +221,7 @@ static const char *get_name_by_field(const struct field_desc *field)
}
/* Generate string of available field names */
-static void display_available_fields(void)
+static void display_available_fields(size_t mode)
{
const struct field_desc *field;
char buf[MAX_BUF_LEN];
@@ -215,6 +229,8 @@ static void display_available_fields(void)
buf[0] = '\0';
for (field = sort_fields; field->name != NULL; field++) {
+ if (!(field->supported_modes & mode))
+ continue;
strncat(buf, "|", MAX_BUF_LEN - strlen(buf) - 1);
strncat(buf, field->name, MAX_BUF_LEN - strlen(buf) - 1);
buf[MAX_BUF_LEN - 1] = '\0';
@@ -235,7 +251,8 @@ static void usage(void)
" -o, --once Display once and exit\n"
" -p, --pid=PID Monitor only the specified PID\n"
" -C, --container=PATH Monitor the container at specified cgroup path\n"
- " -s, --sort=FIELD Sort by delay field (default: cpu)\n");
+ " -s, --sort=FIELD Sort by delay field (default: cpu)\n"
+ " -M, --memverbose Display memory detailed information\n");
exit(0);
}
@@ -253,6 +270,7 @@ static void parse_args(int argc, char **argv)
{"processes", required_argument, 0, 'P'},
{"sort", required_argument, 0, 's'},
{"container", required_argument, 0, 'C'},
+ {"memverbose", no_argument, 0, 'M'},
{0, 0, 0, 0}
};
@@ -264,11 +282,12 @@ static void parse_args(int argc, char **argv)
cfg.output_one_time = 0;
cfg.monitor_pid = 0; /* 0 means monitor all PIDs */
cfg.container_path = NULL;
+ cfg.display_mode = MODE_DEFAULT;
while (1) {
int option_index = 0;
- c = getopt_long(argc, argv, "hd:n:p:oP:C:s:", long_options, &option_index);
+ c = getopt_long(argc, argv, "hd:n:p:oP:C:s:M", long_options, &option_index);
if (c == -1)
break;
@@ -325,12 +344,16 @@ static void parse_args(int argc, char **argv)
/* Show available fields if invalid option provided */
if (!field) {
fprintf(stderr, "Error: invalid sort field '%s'\n", optarg);
- display_available_fields();
+ display_available_fields(MODE_TYPE_ALL);
exit(1);
}
cfg.sort_field = field;
break;
+ case 'M':
+ cfg.display_mode = MODE_MEMVERBOSE;
+ cfg.sort_field = get_field_by_name("mem");
+ break;
default:
fprintf(stderr, "Try 'delaytop --help' for more information.\n");
exit(1);
@@ -338,6 +361,25 @@ static void parse_args(int argc, char **argv)
}
}
+/* Calculate average delay in milliseconds for overall memory */
+static void set_mem_delay_total(struct task_info *t)
+{
+ t->mem_delay_total = t->swapin_delay_total +
+ t->freepages_delay_total +
+ t->thrashing_delay_total +
+ t->compact_delay_total +
+ t->wpcopy_delay_total;
+}
+
+static void set_mem_count(struct task_info *t)
+{
+ t->mem_count = t->swapin_count +
+ t->freepages_count +
+ t->thrashing_count +
+ t->compact_count +
+ t->wpcopy_count;
+}
+
/* Create a raw netlink socket and bind */
static int create_nl_socket(void)
{
@@ -611,6 +653,8 @@ static void fetch_and_fill_task_info(int pid, const char *comm)
SET_TASK_STAT(task_count, wpcopy_delay_total);
SET_TASK_STAT(task_count, irq_count);
SET_TASK_STAT(task_count, irq_delay_total);
+ set_mem_count(&tasks[task_count]);
+ set_mem_delay_total(&tasks[task_count]);
task_count++;
}
break;
@@ -829,27 +873,44 @@ static void display_results(void)
/* Task delay output */
suc &= BOOL_FPRINT(out, "Top %d processes (sorted by %s delay):\n",
cfg.max_processes, get_name_by_field(cfg.sort_field));
- suc &= BOOL_FPRINT(out, "%5s %5s %-17s", "PID", "TGID", "COMMAND");
- suc &= BOOL_FPRINT(out, "%7s %7s %7s %7s %7s %7s %7s %7s\n",
- "CPU(ms)", "IO(ms)", "SWAP(ms)", "RCL(ms)",
- "THR(ms)", "CMP(ms)", "WP(ms)", "IRQ(ms)");
- suc &= BOOL_FPRINT(out, "-----------------------------------------------");
- suc &= BOOL_FPRINT(out, "----------------------------------------------\n");
+ suc &= BOOL_FPRINT(out, "%8s %8s %-17s", "PID", "TGID", "COMMAND");
+ if (cfg.display_mode == MODE_MEMVERBOSE) {
+ suc &= BOOL_FPRINT(out, "%8s %8s %8s %8s %8s %8s\n",
+ "MEM(ms)", "SWAP(ms)", "RCL(ms)",
+ "THR(ms)", "CMP(ms)", "WP(ms)");
+ suc &= BOOL_FPRINT(out, "-----------------------");
+ suc &= BOOL_FPRINT(out, "-----------------------");
+ suc &= BOOL_FPRINT(out, "-----------------------");
+ suc &= BOOL_FPRINT(out, "---------------------\n");
+ } else {
+ suc &= BOOL_FPRINT(out, "%8s %8s %8s %8s\n",
+ "CPU(ms)", "IO(ms)", "IRQ(ms)", "MEM(ms)");
+ suc &= BOOL_FPRINT(out, "-----------------------");
+ suc &= BOOL_FPRINT(out, "-----------------------");
+ suc &= BOOL_FPRINT(out, "--------------------------\n");
+ }
+
count = task_count < cfg.max_processes ? task_count : cfg.max_processes;
for (i = 0; i < count; i++) {
- suc &= BOOL_FPRINT(out, "%5d %5d %-15s",
+ suc &= BOOL_FPRINT(out, "%8d %8d %-15s",
tasks[i].pid, tasks[i].tgid, tasks[i].command);
- suc &= BOOL_FPRINT(out, "%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f\n",
- average_ms(tasks[i].cpu_delay_total, tasks[i].cpu_count),
- average_ms(tasks[i].blkio_delay_total, tasks[i].blkio_count),
- average_ms(tasks[i].swapin_delay_total, tasks[i].swapin_count),
- average_ms(tasks[i].freepages_delay_total, tasks[i].freepages_count),
- average_ms(tasks[i].thrashing_delay_total, tasks[i].thrashing_count),
- average_ms(tasks[i].compact_delay_total, tasks[i].compact_count),
- average_ms(tasks[i].wpcopy_delay_total, tasks[i].wpcopy_count),
- average_ms(tasks[i].irq_delay_total, tasks[i].irq_count));
+ if (cfg.display_mode == MODE_MEMVERBOSE) {
+ suc &= BOOL_FPRINT(out, DELAY_FMT_MEMVERBOSE,
+ TASK_AVG(tasks[i], mem),
+ TASK_AVG(tasks[i], swapin),
+ TASK_AVG(tasks[i], freepages),
+ TASK_AVG(tasks[i], thrashing),
+ TASK_AVG(tasks[i], compact),
+ TASK_AVG(tasks[i], wpcopy));
+ } else {
+ suc &= BOOL_FPRINT(out, DELAY_FMT_DEFAULT,
+ TASK_AVG(tasks[i], cpu),
+ TASK_AVG(tasks[i], blkio),
+ TASK_AVG(tasks[i], irq),
+ TASK_AVG(tasks[i], mem));
+ }
}
suc &= BOOL_FPRINT(out, "\n");
@@ -891,6 +952,13 @@ int main(int argc, char **argv)
/* Main loop */
while (running) {
+ /* Exit when sort field do not match display mode */
+ if (!(cfg.sort_field->supported_modes & cfg.display_mode)) {
+ fprintf(stderr, "Sort field not supported in this mode\n");
+ display_available_fields(cfg.display_mode);
+ break;
+ }
+
/* Read PSI statistics */
read_psi_stats();
--
2.25.1
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