fs/xfs/xfs_stats.c

Source file repositories/reference/linux-study-clean/fs/xfs/xfs_stats.c

File Facts

System
Linux kernel
Corpus path
fs/xfs/xfs_stats.c
Extension
.c
Size
5319 bytes
Lines
180
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs_platform.h"

struct xstats xfsstats;

static int counter_val(struct xfsstats __percpu *stats, int idx)
{
	int val = 0, cpu;

	for_each_possible_cpu(cpu)
		val += *(((__u32 *)per_cpu_ptr(stats, cpu) + idx));
	return val;
}

int xfs_stats_format(struct xfsstats __percpu *stats, char *buf)
{
	int		i, j;
	int		len = 0;
	uint64_t	xs_xstrat_bytes = 0;
	uint64_t	xs_write_bytes = 0;
	uint64_t	xs_read_bytes = 0;
	uint64_t	xs_defer_relog = 0;
	uint64_t	xs_gc_bytes = 0;

	static const struct xstats_entry {
		char	*desc;
		int	endpoint;
	} xstats[] = {
		{ "extent_alloc",	xfsstats_offset(xs_abt_lookup)	},
		{ "abt",		xfsstats_offset(xs_blk_mapr)	},
		{ "blk_map",		xfsstats_offset(xs_bmbt_lookup)	},
		{ "bmbt",		xfsstats_offset(xs_dir_lookup)	},
		{ "dir",		xfsstats_offset(xs_trans_sync)	},
		{ "trans",		xfsstats_offset(xs_ig_attempts)	},
		{ "ig",			xfsstats_offset(xs_log_writes)	},
		{ "log",		xfsstats_offset(xs_try_logspace)},
		{ "push_ail",		xfsstats_offset(xs_xstrat_quick)},
		{ "xstrat",		xfsstats_offset(xs_write_calls)	},
		{ "rw",			xfsstats_offset(xs_attr_get)	},
		{ "attr",		xfsstats_offset(xs_iflush_count)},
		{ "icluster",		xfsstats_offset(xs_inodes_active) },
		{ "vnodes",		xfsstats_offset(xb_get)		},
		{ "buf",		xfsstats_offset(xs_abtb_2)	},
		{ "abtb2",		xfsstats_offset(xs_abtc_2)	},
		{ "abtc2",		xfsstats_offset(xs_bmbt_2)	},
		{ "bmbt2",		xfsstats_offset(xs_ibt_2)	},
		{ "ibt2",		xfsstats_offset(xs_fibt_2)	},
		{ "fibt2",		xfsstats_offset(xs_rmap_2)	},
		{ "rmapbt",		xfsstats_offset(xs_refcbt_2)	},
		{ "refcntbt",		xfsstats_offset(xs_rmap_mem_2)	},
		{ "rmapbt_mem",		xfsstats_offset(xs_rcbag_2)	},
		{ "rcbagbt",		xfsstats_offset(xs_rtrmap_2)	},
		{ "rtrmapbt",		xfsstats_offset(xs_rtrmap_mem_2)},
		{ "rtrmapbt_mem",	xfsstats_offset(xs_rtrefcbt_2)	},
		{ "rtrefcntbt",		xfsstats_offset(xs_qm_dqreclaims)},
		/* we print both series of quota information together */
		{ "qm",			xfsstats_offset(xs_gc_read_calls)},
		{ "zoned",		xfsstats_offset(xs_inodes_meta)},
		{ "metafile",		xfsstats_offset(xs_xstrat_bytes)},
	};

	/* Loop over all stats groups */

	for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
		len += scnprintf(buf + len, PATH_MAX - len, "%s",
				xstats[i].desc);
		/* inner loop does each group */
		for (; j < xstats[i].endpoint; j++)
			len += scnprintf(buf + len, PATH_MAX - len, " %u",
					counter_val(stats, j));
		len += scnprintf(buf + len, PATH_MAX - len, "\n");
	}
	/* extra precision counters */
	for_each_possible_cpu(i) {
		xs_xstrat_bytes += per_cpu_ptr(stats, i)->s.xs_xstrat_bytes;
		xs_write_bytes += per_cpu_ptr(stats, i)->s.xs_write_bytes;
		xs_read_bytes += per_cpu_ptr(stats, i)->s.xs_read_bytes;
		xs_defer_relog += per_cpu_ptr(stats, i)->s.xs_defer_relog;
		xs_gc_bytes += per_cpu_ptr(stats, i)->s.xs_gc_bytes;
	}

	len += scnprintf(buf + len, PATH_MAX-len, "xpc %llu %llu %llu\n",
			xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
	len += scnprintf(buf + len, PATH_MAX-len, "defer_relog %llu\n",
			xs_defer_relog);
	len += scnprintf(buf + len, PATH_MAX-len, "debug %u\n",

Annotation

Implementation Notes