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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-08-22 13:56:53 -0700
committerIngo Molnar <mingo@elte.hu>2009-08-23 10:32:40 +0200
commit6b3ef48adf847f7adf11c870e3ffacac150f1564 (patch)
treee1403ce515bf00ade99ec806f6ab6b6db999aa0b /kernel/rcupreempt_trace.c
parentf41d911f8c49a5d65c86504c19e8204bb605c4fd (diff)
rcu: Remove CONFIG_PREEMPT_RCU
Now that CONFIG_TREE_PREEMPT_RCU is in place, there is no further need for CONFIG_PREEMPT_RCU. Remove it, along with whatever subtle bugs it may (or may not) contain. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josht@linux.vnet.ibm.com Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org LKML-Reference: <125097461396-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcupreempt_trace.c')
-rw-r--r--kernel/rcupreempt_trace.c335
1 files changed, 0 insertions, 335 deletions
diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
deleted file mode 100644
index 11640346a507..000000000000
--- a/kernel/rcupreempt_trace.c
+++ /dev/null
@@ -1,335 +0,0 @@
-/*
- * Read-Copy Update tracing for realtime implementation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright IBM Corporation, 2006
- *
- * Papers: http://www.rdrop.com/users/paulmck/RCU
- *
- * For detailed explanation of Read-Copy Update mechanism see -
- * Documentation/RCU/ *.txt
- *
- */
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/smp.h>
-#include <linux/rcupdate.h>
-#include <linux/interrupt.h>
-#include <linux/sched.h>
-#include <asm/atomic.h>
-#include <linux/bitops.h>
-#include <linux/module.h>
-#include <linux/completion.h>
-#include <linux/moduleparam.h>
-#include <linux/percpu.h>
-#include <linux/notifier.h>
-#include <linux/cpu.h>
-#include <linux/mutex.h>
-#include <linux/rcupreempt_trace.h>
-#include <linux/debugfs.h>
-
-static struct mutex rcupreempt_trace_mutex;
-static char *rcupreempt_trace_buf;
-#define RCUPREEMPT_TRACE_BUF_SIZE 4096
-
-void rcupreempt_trace_move2done(struct rcupreempt_trace *trace)
-{
- trace->done_length += trace->wait_length;
- trace->done_add += trace->wait_length;
- trace->wait_length = 0;
-}
-void rcupreempt_trace_move2wait(struct rcupreempt_trace *trace)
-{
- trace->wait_length += trace->next_length;
- trace->wait_add += trace->next_length;
- trace->next_length = 0;
-}
-void rcupreempt_trace_try_flip_1(struct rcupreempt_trace *trace)
-{
- atomic_inc(&trace->rcu_try_flip_1);
-}
-void rcupreempt_trace_try_flip_e1(struct rcupreempt_trace *trace)
-{
- atomic_inc(&trace->rcu_try_flip_e1);
-}
-void rcupreempt_trace_try_flip_i1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_i1++;
-}
-void rcupreempt_trace_try_flip_ie1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_ie1++;
-}
-void rcupreempt_trace_try_flip_g1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_g1++;
-}
-void rcupreempt_trace_try_flip_a1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_a1++;
-}
-void rcupreempt_trace_try_flip_ae1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_ae1++;
-}
-void rcupreempt_trace_try_flip_a2(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_a2++;
-}
-void rcupreempt_trace_try_flip_z1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_z1++;
-}
-void rcupreempt_trace_try_flip_ze1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_ze1++;
-}
-void rcupreempt_trace_try_flip_z2(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_z2++;
-}
-void rcupreempt_trace_try_flip_m1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_m1++;
-}
-void rcupreempt_trace_try_flip_me1(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_me1++;
-}
-void rcupreempt_trace_try_flip_m2(struct rcupreempt_trace *trace)
-{
- trace->rcu_try_flip_m2++;
-}
-void rcupreempt_trace_check_callbacks(struct rcupreempt_trace *trace)
-{
- trace->rcu_check_callbacks++;
-}
-void rcupreempt_trace_done_remove(struct rcupreempt_trace *trace)
-{
- trace->done_remove += trace->done_length;
- trace->done_length = 0;
-}
-void rcupreempt_trace_invoke(struct rcupreempt_trace *trace)
-{
- atomic_inc(&trace->done_invoked);
-}
-void rcupreempt_trace_next_add(struct rcupreempt_trace *trace)
-{
- trace->next_add++;
- trace->next_length++;
-}
-
-static void rcupreempt_trace_sum(struct rcupreempt_trace *sp)
-{
- struct rcupreempt_trace *cp;
- int cpu;
-
- memset(sp, 0, sizeof(*sp));
- for_each_possible_cpu(cpu) {
- cp = rcupreempt_trace_cpu(cpu);
- sp->next_length += cp->next_length;
- sp->next_add += cp->next_add;
- sp->wait_length += cp->wait_length;
- sp->wait_add += cp->wait_add;
- sp->done_length += cp->done_length;
- sp->done_add += cp->done_add;
- sp->done_remove += cp->done_remove;
- atomic_add(atomic_read(&cp->done_invoked), &sp->done_invoked);
- sp->rcu_check_callbacks += cp->rcu_check_callbacks;
- atomic_add(atomic_read(&cp->rcu_try_flip_1),
- &sp->rcu_try_flip_1);
- atomic_add(atomic_read(&cp->rcu_try_flip_e1),
- &sp->rcu_try_flip_e1);
- sp->rcu_try_flip_i1 += cp->rcu_try_flip_i1;
- sp->rcu_try_flip_ie1 += cp->rcu_try_flip_ie1;
- sp->rcu_try_flip_g1 += cp->rcu_try_flip_g1;
- sp->rcu_try_flip_a1 += cp->rcu_try_flip_a1;
- sp->rcu_try_flip_ae1 += cp->rcu_try_flip_ae1;
- sp->rcu_try_flip_a2 += cp->rcu_try_flip_a2;
- sp->rcu_try_flip_z1 += cp->rcu_try_flip_z1;
- sp->rcu_try_flip_ze1 += cp->rcu_try_flip_ze1;
- sp->rcu_try_flip_z2 += cp->rcu_try_flip_z2;
- sp->rcu_try_flip_m1 += cp->rcu_try_flip_m1;
- sp->rcu_try_flip_me1 += cp->rcu_try_flip_me1;
- sp->rcu_try_flip_m2 += cp->rcu_try_flip_m2;
- }
-}
-
-static ssize_t rcustats_read(struct file *filp, char __user *buffer,
- size_t count, loff_t *ppos)
-{
- struct rcupreempt_trace trace;
- ssize_t bcount;
- int cnt = 0;
-
- rcupreempt_trace_sum(&trace);
- mutex_lock(&rcupreempt_trace_mutex);
- snprintf(&rcupreempt_trace_buf[cnt], RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "ggp=%ld rcc=%ld\n",
- rcu_batches_completed(),
- trace.rcu_check_callbacks);
- snprintf(&rcupreempt_trace_buf[cnt], RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "na=%ld nl=%ld wa=%ld wl=%ld da=%ld dl=%ld dr=%ld di=%d\n"
- "1=%d e1=%d i1=%ld ie1=%ld g1=%ld a1=%ld ae1=%ld a2=%ld\n"
- "z1=%ld ze1=%ld z2=%ld m1=%ld me1=%ld m2=%ld\n",
-
- trace.next_add, trace.next_length,
- trace.wait_add, trace.wait_length,
- trace.done_add, trace.done_length,
- trace.done_remove, atomic_read(&trace.done_invoked),
- atomic_read(&trace.rcu_try_flip_1),
- atomic_read(&trace.rcu_try_flip_e1),
- trace.rcu_try_flip_i1, trace.rcu_try_flip_ie1,
- trace.rcu_try_flip_g1,
- trace.rcu_try_flip_a1, trace.rcu_try_flip_ae1,
- trace.rcu_try_flip_a2,
- trace.rcu_try_flip_z1, trace.rcu_try_flip_ze1,
- trace.rcu_try_flip_z2,
- trace.rcu_try_flip_m1, trace.rcu_try_flip_me1,
- trace.rcu_try_flip_m2);
- bcount = simple_read_from_buffer(buffer, count, ppos,
- rcupreempt_trace_buf, strlen(rcupreempt_trace_buf));
- mutex_unlock(&rcupreempt_trace_mutex);
- return bcount;
-}
-
-static ssize_t rcugp_read(struct file *filp, char __user *buffer,
- size_t count, loff_t *ppos)
-{
- long oldgp = rcu_batches_completed();
- ssize_t bcount;
-
- mutex_lock(&rcupreempt_trace_mutex);
- synchronize_rcu();
- snprintf(rcupreempt_trace_buf, RCUPREEMPT_TRACE_BUF_SIZE,
- "oldggp=%ld newggp=%ld\n", oldgp, rcu_batches_completed());
- bcount = simple_read_from_buffer(buffer, count, ppos,
- rcupreempt_trace_buf, strlen(rcupreempt_trace_buf));
- mutex_unlock(&rcupreempt_trace_mutex);
- return bcount;
-}
-
-static ssize_t rcuctrs_read(struct file *filp, char __user *buffer,
- size_t count, loff_t *ppos)
-{
- int cnt = 0;
- int cpu;
- int f = rcu_batches_completed() & 0x1;
- ssize_t bcount;
-
- mutex_lock(&rcupreempt_trace_mutex);
-
- cnt += snprintf(&rcupreempt_trace_buf[cnt], RCUPREEMPT_TRACE_BUF_SIZE,
- "CPU last cur F M\n");
- for_each_possible_cpu(cpu) {
- long *flipctr = rcupreempt_flipctr(cpu);
- cnt += snprintf(&rcupreempt_trace_buf[cnt],
- RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "%3d%c %4ld %3ld %d %d\n",
- cpu,
- cpu_is_offline(cpu) ? '!' : ' ',
- flipctr[!f],
- flipctr[f],
- rcupreempt_flip_flag(cpu),
- rcupreempt_mb_flag(cpu));
- }
- cnt += snprintf(&rcupreempt_trace_buf[cnt],
- RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "ggp = %ld, state = %s\n",
- rcu_batches_completed(),
- rcupreempt_try_flip_state_name());
- cnt += snprintf(&rcupreempt_trace_buf[cnt],
- RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "\n");
- bcount = simple_read_from_buffer(buffer, count, ppos,
- rcupreempt_trace_buf, strlen(rcupreempt_trace_buf));
- mutex_unlock(&rcupreempt_trace_mutex);
- return bcount;
-}
-
-static struct file_operations rcustats_fops = {
- .owner = THIS_MODULE,
- .read = rcustats_read,
-};
-
-static struct file_operations rcugp_fops = {
- .owner = THIS_MODULE,
- .read = rcugp_read,
-};
-
-static struct file_operations rcuctrs_fops = {
- .owner = THIS_MODULE,
- .read = rcuctrs_read,
-};
-
-static struct dentry *rcudir, *statdir, *ctrsdir, *gpdir;
-static int rcupreempt_debugfs_init(void)
-{
- rcudir = debugfs_create_dir("rcu", NULL);
- if (!rcudir)
- goto out;
- statdir = debugfs_create_file("rcustats", 0444, rcudir,
- NULL, &rcustats_fops);
- if (!statdir)
- goto free_out;
-
- gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
- if (!gpdir)
- goto free_out;
-
- ctrsdir = debugfs_create_file("rcuctrs", 0444, rcudir,
- NULL, &rcuctrs_fops);
- if (!ctrsdir)
- goto free_out;
- return 0;
-free_out:
- if (statdir)
- debugfs_remove(statdir);
- if (gpdir)
- debugfs_remove(gpdir);
- debugfs_remove(rcudir);
-out:
- return 1;
-}
-
-static int __init rcupreempt_trace_init(void)
-{
- int ret;
-
- mutex_init(&rcupreempt_trace_mutex);
- rcupreempt_trace_buf = kmalloc(RCUPREEMPT_TRACE_BUF_SIZE, GFP_KERNEL);
- if (!rcupreempt_trace_buf)
- return 1;
- ret = rcupreempt_debugfs_init();
- if (ret)
- kfree(rcupreempt_trace_buf);
- return ret;
-}
-
-static void __exit rcupreempt_trace_cleanup(void)
-{
- debugfs_remove(statdir);
- debugfs_remove(gpdir);
- debugfs_remove(ctrsdir);
- debugfs_remove(rcudir);
- kfree(rcupreempt_trace_buf);
-}
-
-
-module_init(rcupreempt_trace_init);
-module_exit(rcupreempt_trace_cleanup);