/* CacheFiles statistics * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #include #include #include #include "internal.h" atomic_t cachefiles_lookup_histogram[HZ]; atomic_t cachefiles_mkdir_histogram[HZ]; atomic_t cachefiles_create_histogram[HZ]; /* * display the latency histogram */ static int cachefiles_histogram_show(struct seq_file *m, void *v) { unsigned long index; unsigned x, y, z, t; switch ((unsigned long) v) { case 1: seq_puts(m, "JIFS SECS LOOKUPS MKDIRS CREATES\n"); return 0; case 2: seq_puts(m, "===== ===== ========= ========= =========\n"); return 0; default: index = (unsigned long) v - 3; x = atomic_read(&cachefiles_lookup_histogram[index]); y = atomic_read(&cachefiles_mkdir_histogram[index]); z = atomic_read(&cachefiles_create_histogram[index]); if (x == 0 && y == 0 && z == 0) return 0; t = (index * 1000) / HZ; seq_printf(m, "%4lu 0.%03u %9u %9u %9u\n", index, t, x, y, z); return 0; } } /* * set up the iterator to start reading from the first line */ static void *cachefiles_histogram_start(struct seq_file *m, loff_t *_pos) { if ((unsigned long long)*_pos >= HZ + 2) return NULL; if (*_pos == 0) *_pos = 1; return (void *)(unsigned long) *_pos; } /* * move to the next line */ static void *cachefiles_histogram_next(struct seq_file *m, void *v, loff_t *pos) { (*pos)++; return (unsigned long long)*pos > HZ + 2 ? NULL : (void *)(unsigned long) *pos; } /* * clean up after reading */ static void cachefiles_histogram_stop(struct seq_file *m, void *v) { } static const struct seq_operations cachefiles_histogram_ops = { .start = cachefiles_histogram_start, .stop = cachefiles_histogram_stop, .next = cachefiles_histogram_next, .show = cachefiles_histogram_show, }; /* * open "/proc/fs/cachefiles/XXX" which provide statistics summaries */ static int cachefiles_histogram_open(struct inode *inode, struct file *file) { return seq_open(file, &cachefiles_histogram_ops); } static const struct file_operations cachefiles_histogram_fops = { .open = cachefiles_histogram_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; /* * initialise the /proc/fs/cachefiles/ directory */ int __init cachefiles_proc_init(void) { _enter(""); if (!proc_mkdir("fs/cachefiles", NULL)) goto error_dir; if (!proc_create("fs/cachefiles/histogram", S_IFREG | 0444, NULL, &cachefiles_histogram_fops)) goto error_histogram; _leave(" = 0"); return 0; error_histogram: remove_proc_entry("fs/cachefiles", NULL); error_dir: _leave(" = -ENOMEM"); return -ENOMEM; } /* * clean up the /proc/fs/cachefiles/ directory */ void cachefiles_proc_cleanup(void) { remove_proc_entry("fs/cachefiles/histogram", NULL); remove_proc_entry("fs/cachefiles", NULL); } change='this.form.submit();'>space:mode:
authorDavid S. Miller <davem@davemloft.net>2017-02-06 16:53:30 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-06 16:53:30 -0500
commit9172d2a026f95f217da81610037608996d3f6a3f (patch)
tree07ed46ceedeb980d62da34ae26e3aac5f8af7dfb /net/dsa
parent321fa4ffd94e333657e54037d2511c862ec92f6f (diff)
parent04d3a4c6af52a58370795bc9f70dc15f51f8bb84 (diff)
Merge branch 'dsa-add-fabric-notifier'
Vivien Didelot says: ==================== net: dsa: add fabric notifier When a switch fabric is composed of multiple switch chips, these chips must be programmed accordingly when an event occurred on one of them. Examples of such event include hardware bridging: when a Linux bridge spans interconnected chips, they must be programmed to allow external ports to ingress frames on their internal ports. Another example is cross-chip hardware VLANs. Switch chips in-between interconnected bridge ports must also configure a given VLAN to allow packets to pass through them. In order to support that, this patchset introduces a non-intrusive notifier mechanism. It adds a notifier head in every DSA switch tree (the said fabric), and a notifier block in every DSA switch chip. When an even occurs, it is chained to all notifiers of the fabric. Switch chips can react accordingly if they are cross-chip capable. On a dynamic debug enabled system, bridging a port in a multi-chip fabric will print something like this (ZII Rev B board): # brctl addif br0 lan3 mv88e6085 0.1:00: crosschip DSA port 1.0 bridged to br0 mv88e6085 0.4:00: crosschip DSA port 1.0 bridged to br0 # brctl delif br0 lan3 mv88e6085 0.1:00: crosschip DSA port 1.0 unbridged from br0 mv88e6085 0.4:00: crosschip DSA port 1.0 unbridged from br0 Currently only bridging events are added. A patchset introducing support for cross-chip hardware bridging configuration in mv88e6xxx will follow right after. Then events for switchdev operations are next on the line. We should note that non-switchdev events do not support rolling-back switch-wide operations. We'll have to work on closer integration with switchdev for that, like introducing new attributes or objects, to benefit from the prepare and commit phases. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/Makefile1
-rw-r--r--net/dsa/dsa.c16
-rw-r--r--net/dsa/dsa2.c6
-rw-r--r--net/dsa/dsa_priv.h8
-rw-r--r--net/dsa/slave.c121
-rw-r--r--net/dsa/switch.c85
6 files changed, 188 insertions, 49 deletions
diff --git a/net/dsa/Makefile b/net/dsa/Makefile