> Maybe you can try my test-case at https://lkml.org/lkml/2012/3/31/90 ? There seem to be a few cut & paste errors in that version (threads 3, 4, 5 think they are "Thread 2"). Also no check for malloc failing (which since it is done in an infinite loop seems inevitable - unless your machines have infinite memory :-) Fixed up version attached. Seems to run without any lockups on a kernel with your patch applied until either the malloc's start to fail, or the OOM killer zaps it. I put your patch into my "next" tree - it's in linux-next tag "next-20120614" and I'll push to Linus in the next merge window. Thanks -Tony
/* https://lkml.org/lkml/2012/3/31/90 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#define ALLOC_BYTE 512*1024
#define COUNT 50
void *alloc_function_one( void *ptr );
void *alloc_function_two( void *ptr );
void *alloc_function_three( void *ptr );
void *alloc_function_four( void *ptr );
void *alloc_function_five( void *ptr );
void *enable_function( void *ptr );
int main(int argc, char *argv[])
{
pthread_t thread1, thread2, thread3, thread4, thread5;
char *message1 = "Thread 1";
char *message2 = "Thread 2";
char *message3 = "Thread 3";
char *message4 = "Thread 4";
char *message5 = "Thread 5";
int iret1 = -1;
int iret2 = -1;
int iret3 = -1;
int iret4 = -1;
int iret5 = -1;
fork();
iret1 = pthread_create( &thread1, NULL, alloc_function_one, (void*) message1);
iret2 = pthread_create( &thread2, NULL, alloc_function_two, (void*) message2);
iret3 = pthread_create( &thread3, NULL, alloc_function_three, (void*) message3);
iret4 = pthread_create( &thread4, NULL, alloc_function_four, (void*) message4);
iret5 = pthread_create( &thread5, NULL, alloc_function_five, (void*) message5);
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
pthread_join( thread3, NULL);
pthread_join( thread4, NULL);
pthread_join( thread5, NULL);
printf("Thread 1 returns: %d\n",iret1);
printf("Thread 2 returns: %d\n",iret2);
printf("Thread 3 returns: %d\n",iret3);
printf("Thread 4 returns: %d\n",iret4);
printf("Thread 5 returns: %d\n",iret5);
exit(0);
}
void *alloc_function_two( void *ptr )
{
char *message;
message = (char *) ptr;
void *myblock[COUNT];
int i= 0,j=0;
int freed=0;
printf("message_alloc \n");
while(1)
{
memset(myblock,0,sizeof(myblock));
printf("message_alloc %s \n",message);
for(i=0;i< COUNT ;i++)
{
myblock[i] = (void *) malloc(ALLOC_BYTE);
if (myblock[i] == NULL) {
printf("malloc failed in %s\n", message);
return NULL;
}
memset(myblock[i],1, ALLOC_BYTE);
}
}
}
void *alloc_function_one( void *ptr )
{
char *message;
message = (char *) ptr;
void *myblock[COUNT];
int i= 0,j=0;
int freed=0;
printf("message_alloc \n");
while(1)
{
memset(myblock,0,sizeof(myblock));
printf("message_alloc %s \n",message);
for(i=0;i< COUNT ;i++)
{
myblock[i] = (void *) malloc(ALLOC_BYTE);
if (myblock[i] == NULL) {
printf("malloc failed in %s\n", message);
return NULL;
}
memset(myblock[i],1, ALLOC_BYTE);
}
}
}
void *alloc_function_three( void *ptr )
{
char *message;
message = (char *) ptr;
void *myblock[COUNT];
int i= 0,j=0;
int freed=0;
printf("message_alloc \n");
while(1)
{
memset(myblock,0,sizeof(myblock));
printf("message_alloc %s \n",message);
for(i=0;i< COUNT ;i++)
{
myblock[i] = (void *) malloc(ALLOC_BYTE);
if (myblock[i] == NULL) {
printf("malloc failed in %s\n", message);
return NULL;
}
memset(myblock[i],1, ALLOC_BYTE);
}
}
}
void *alloc_function_four( void *ptr )
{
char *message;
message = (char *) ptr;
void *myblock[COUNT];
int i= 0,j=0;
int freed=0;
printf("message_alloc \n");
while(1)
{
memset(myblock,0,sizeof(myblock));
printf("message_alloc %s \n",message);
for(i=0;i< COUNT ;i++)
{
myblock[i] = (void *) malloc(ALLOC_BYTE);
if (myblock[i] == NULL) {
printf("malloc failed in %s\n", message);
return NULL;
}
memset(myblock[i],1, ALLOC_BYTE);
}
}
}
void *alloc_function_five( void *ptr )
{
char *message;
message = (char *) ptr;
void *myblock[COUNT];
int i= 0,j=0;
int freed=0;
printf("message_alloc \n");
while(1)
{
memset(myblock,0,sizeof(myblock));
printf("message_alloc %s \n",message);
for(i=0;i< COUNT ;i++)
{
myblock[i] = (void *) malloc(ALLOC_BYTE);
if (myblock[i] == NULL) {
printf("malloc failed in %s\n", message);
return NULL;
}
memset(myblock[i],1, ALLOC_BYTE);
}
}
}
|