Date:   Mon, 14 Jan 2019 20:08:20 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Reinette Chatre <reinette.chatre@...el.com>,
        James Morse <james.morse@....com>,
        Xiaochen Shen <xiaochen.shen@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@...el.com>
CC:     linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/10] selftests/resctrl: Add Cache Allocation
 Technology (CAT) selftest

Hi Fenghua/Sai/Arshiya,

Few comments on this patch below. Sorry for the late comment.

On 12/21/18 6:20 PM, Fenghua Yu wrote:
> From: Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@...el.com>
> 
> Cache Allocation Technology (CAT) selftest allocates a portion of
> last level cache and starts a benchmark to read each cache
> line in this portion of cache. Measure the cache misses in perf and
> the misses should be equal to the number of cache lines in this
> portion of cache.
> 
> We don't use CQM to calculate cache usage because some CAT enabled
> platforms don't have CQM.
> 
> Signed-off-by: Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@...el.com>
> Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  tools/testing/selftests/resctrl/Makefile      |   2 +-
>  tools/testing/selftests/resctrl/cache.c       | 175 ++++++++++++-
>  tools/testing/selftests/resctrl/cat_test.c    | 243 ++++++++++++++++++
>  tools/testing/selftests/resctrl/fill_buf.c    |  10 +-
>  tools/testing/selftests/resctrl/resctrl.h     |   3 +
>  .../testing/selftests/resctrl/resctrl_tests.c |  15 +-
>  tools/testing/selftests/resctrl/resctrlfs.c   |   8 +-
>  7 files changed, 448 insertions(+), 8 deletions(-)
>  create mode 100644 tools/testing/selftests/resctrl/cat_test.c
> 
> diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
> index 664561cd76e6..0282222b4c22 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -8,7 +8,7 @@ all: resctrl_tests
>  
>  resctrl_tests: *.o
>  	$(CC) $(CFLAGS) -o resctrl_tests resctrl_tests.o resctrlfs.o \
> -		 resctrl_val.o fill_buf.o mbm_test.o mba_test.o cache.o cqm_test.o
> +		 resctrl_val.o fill_buf.o mbm_test.o mba_test.o cache.o cqm_test.o cat_test.o
>  
>  .PHONY: clean
>  
> diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
> index 1256590ef804..c98b7bc6ad9c 100644
> --- a/tools/testing/selftests/resctrl/cache.c
> +++ b/tools/testing/selftests/resctrl/cache.c
> @@ -10,10 +10,107 @@ struct read_format {
>  	} values[2];
>  };
>  
> +static struct perf_event_attr pea_llc_miss;
> +static struct read_format rf_cqm;
> +static int fd_lm;
>  char cbm_mask[256];
>  unsigned long long_mask;
>  char llc_occup_path[1024];
>  
> +static void initialize_perf_event_attr(void)
> +{
> +	pea_llc_miss.type = PERF_TYPE_HARDWARE;
> +	pea_llc_miss.size = sizeof(struct perf_event_attr);
> +	pea_llc_miss.read_format = PERF_FORMAT_GROUP;
> +	pea_llc_miss.exclude_kernel = 1;
> +	pea_llc_miss.exclude_hv = 1;
> +	pea_llc_miss.exclude_idle = 1;
> +	pea_llc_miss.exclude_callchain_kernel = 1;
> +	pea_llc_miss.inherit = 1;
> +	pea_llc_miss.exclude_guest = 1;
> +	pea_llc_miss.disabled = 1;
> +}
> +
> +static void ioctl_perf_event_ioc_reset_enable(void)
> +{
> +	ioctl(fd_lm, PERF_EVENT_IOC_RESET, 0);
> +	ioctl(fd_lm, PERF_EVENT_IOC_ENABLE, 0);
> +}
> +
> +static int perf_event_open_llc_miss(pid_t pid, int cpu_no)
> +{
> +	fd_lm = perf_event_open(&pea_llc_miss, pid, cpu_no, -1,
> +				PERF_FLAG_FD_CLOEXEC);
> +	if (fd_lm == -1) {
> +		perror("Error opening leader");
> +		ctrlc_handler(0, NULL, NULL);
> +		return -1;
> +	}
> +
> +	return 0;
> +}
> +
> +static int initialize_llc_perf(void)
> +{
> +	memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr));
> +	memset(&rf_cqm, 0, sizeof(struct read_format));
> +
> +	/* Initialize perf_event_attr structures for HW_CACHE_MISSES */
> +	initialize_perf_event_attr();
> +
> +	pea_llc_miss.config = PERF_COUNT_HW_CACHE_MISSES;
> +
> +	rf_cqm.nr = 1;
> +
> +	return 0;
> +}
> +
> +static int reset_enable_llc_perf(pid_t pid, int cpu_no)
> +{
> +	int ret = 0;
> +
> +	ret = perf_event_open_llc_miss(pid, cpu_no);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Start counters to log values */
> +	ioctl_perf_event_ioc_reset_enable();
> +
> +	return 0;
> +}
> +
> +/*
> + * get_llc_perf:	llc cache miss through perf events
> + * @cpu_no:		CPU number that the benchmark PID is binded to
> + *
> + * Perf events like HW_CACHE_MISSES could be used to validate number of
> + * cache lines allocated.
> + *
> + * Return: =0 on success.  <0 on failure.
> + */
> +static int get_llc_perf(unsigned long *llc_perf_miss)
> +{
> +	__u64 total_misses;
> +
> +	/* Stop counters after one span to get miss rate */
> +
> +	ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);
> +
> +	if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
> +		perror("Could not get llc misses through perf");
> +
> +		return -1;
> +	}
> +
> +	total_misses = rf_cqm.values[0].value;
> +
> +	close(fd_lm);
> +
> +	*llc_perf_miss = total_misses;
> +
> +	return 0;
> +}
> +
>  /*
>   * Get LLC Occupancy as reported by RESCTRL FS
>   * For CQM,
> @@ -82,9 +179,19 @@ static int print_results_cache(char *filename, int bm_pid,
>  
>  int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
>  {
> -	unsigned long llc_occu_resc = 0, llc_value = 0;
> +	unsigned long llc_perf_miss = 0, llc_occu_resc = 0, llc_value = 0;
>  	int ret;
>  
> +	/*
> +	 * Measure cache miss from perf.
> +	 */
> +	if (!strcmp(param->resctrl_val, "cat")) {
> +		ret = get_llc_perf(&llc_perf_miss);
> +		if (ret < 0)
> +			return ret;
> +		llc_value = llc_perf_miss;
> +	}
> +
>  	/*
>  	 * Measure llc occupancy from resctrl.
>  	 */
> @@ -100,3 +207,69 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
>  
>  	return 0;
>  }
> +
> +/*
> + * cache_val:		execute benchmark and measure LLC occupancy resctrl
> + * and perf cache miss for the benchmark
> + * @param:		parameters passed to cache_val()
> + *
> + * Return:		0 on success. non-zero on failure.
> + */
> +int cat_val(struct resctrl_val_param *param)
> +{
> +	int malloc_and_init_memory = 1, memflush = 1, opeartion = 1, ret = 0;
> +	char *resctrl_val = param->resctrl_val;
> +	pid_t bm_pid;
> +
> +	if (strcmp(param->filename, "") == 0)
> +		sprintf(param->filename, "stdio");
> +
> +	bm_pid = getpid();
> +
> +	/* Taskset benchmark to specified cpu */
> +	ret = taskset_benchmark(bm_pid, param->cpu_no);
> +	if (ret)
> +		return ret;
> +
> +	/* Write benchmark to specified con_mon grp, mon_grp in resctrl FS*/
> +	ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp,
> +				      resctrl_val);
> +	if (ret)
> +		return ret;
> +
> +	if ((strcmp(resctrl_val, "cat") == 0)) {
> +		ret = initialize_llc_perf();
> +		if (ret)
> +			return ret;
> +	}
> +
> +	/* Test runs until the callback setup() tells the test to stop. */
> +	while (1) {
> +		if (strcmp(resctrl_val, "cat") == 0) {
> +			ret = param->setup(1, param);
> +			if (ret) {
> +				ret = 0;
> +				break;
> +			}
> +			ret = reset_enable_llc_perf(bm_pid, param->cpu_no);
> +			if (ret)
> +				break;
> +
> +			if (run_fill_buf(param->span, malloc_and_init_memory,
> +					 memflush, opeartion, resctrl_val)) {
> +				fprintf(stderr, "Error-running fill buffer\n");
> +				ret = -1;
> +				break;
> +			}
> +
> +			sleep(1);
> +			ret = measure_cache_vals(param, bm_pid);
> +			if (ret)
> +				break;
> +		} else {
> +			break;
> +		}
> +	}
> +
> +	return ret;
> +}
> diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
> new file mode 100644
> index 000000000000..57d501d8a153
> --- /dev/null
> +++ b/tools/testing/selftests/resctrl/cat_test.c
> @@ -0,0 +1,243 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Cache Allocation Technology (CAT) test
> + *
> + * Copyright (C) 2018 Intel Corporation
> + *
> + * Authors:
> + *    Arshiya Hayatkhan Pathan <arshiya.hayatkhan.pathan@...el.com>
> + *    Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
> + *    Fenghua Yu <fenghua.yu@...el.com>
> + */
> +#include "resctrl.h"
> +#include <unistd.h>
> +
> +#define RESULT_FILE_NAME1	"result_cat1"
> +#define RESULT_FILE_NAME2	"result_cat2"
> +#define NUM_OF_RUNS		5
> +#define MAX_DIFF_PERCENT	4
> +#define MAX_DIFF		1000000
> +
> +int count_of_bits;
> +char cbm_mask[256];
> +unsigned long long_mask;
> +unsigned long cache_size;
> +
> +/*
> + * Change schemata. Write schemata to specified
> + * con_mon grp, mon_grp in resctrl FS.
> + * Run 5 times in order to get average values.
> + */
> +static int cat_setup(int num, ...)
> +{
> +	struct resctrl_val_param *p;
> +	char schemata[64];
> +	va_list param;
> +	int ret = 0;
> +
> +	va_start(param, num);
> +	p = va_arg(param, struct resctrl_val_param *);
> +	va_end(param);
> +
> +	/* Run NUM_OF_RUNS times */
> +	if (p->num_of_runs >= NUM_OF_RUNS)
> +		return -1;
> +
> +	if (p->num_of_runs == 0) {
> +		sprintf(schemata, "%lx", p->mask);
> +		ret = write_schemata(p->ctrlgrp, schemata, p->cpu_no,
> +				     p->resctrl_val);
> +	}
> +	p->num_of_runs++;
> +
> +	return ret;
> +}
> +
> +static void show_cache_info(unsigned long sum_llc_perf_miss, int no_of_bits,
> +			    unsigned long span)
> +{
> +	unsigned long allocated_cache_lines = span / 64;
> +	unsigned long avg_llc_perf_miss = 0;
> +	float diff_percent;
> +
> +	avg_llc_perf_miss = sum_llc_perf_miss / (NUM_OF_RUNS - 1);
> +	diff_percent = ((float)allocated_cache_lines - avg_llc_perf_miss) /
> +				allocated_cache_lines * 100;
> +	printf("Results are displayed in (Bytes)\n");
> +	printf("\nNumber of bits: %d \t", no_of_bits);
> +	printf("Avg_llc_perf_miss: %lu \t", avg_llc_perf_miss);
> +	printf("Allocated cache lines: %lu \t", allocated_cache_lines);
> +	printf("Percent diff=%d \t", abs((int)diff_percent));
> +
> +	if (abs((int)diff_percent) > MAX_DIFF_PERCENT)
> +		printf("Failed\n");
> +	else
> +		printf("Passed\n");

How do you decide pass or fail based on MAX_DIFF_PERCENT(4)? Is this
explained somewhere in the specs?

> +}
> +
> +static int check_results(struct resctrl_val_param *param)
> +{
> +	char *token_array[8], temp[512];
> +	unsigned long sum_llc_perf_miss = 0;
> +	int runs = 0, no_of_bits = 0;
> +	FILE *fp;
> +
> +	printf("\nChecking for pass/fail\n");
> +	fp = fopen(param->filename, "r");
> +	if (!fp) {
> +		perror("Error in opening file\n");
> +
> +		return errno;
> +	}
> +
> +	while (fgets(temp, 1024, fp)) {
> +		char *token = strtok(temp, ":\t");
> +		int fields = 0;
> +
> +		while (token) {
> +			token_array[fields++] = token;
> +			token = strtok(NULL, ":\t");
> +		}
> +		/*
> +		 * Discard the first value which is inaccurate due to monitoring
> +		 * setup transition phase.
> +		 */
> +		if (runs > 0)
> +			sum_llc_perf_miss += atol(token_array[3]);
> +		runs++;
> +	}
> +
> +	fclose(fp);
> +	no_of_bits = count_bits(param->mask);
> +
> +	show_cache_info(sum_llc_perf_miss, no_of_bits, param->span);
> +
> +	return 0;
> +}
> +
> +void cat_test_cleanup(void)
> +{
> +	remove(RESULT_FILE_NAME1);
> +	remove(RESULT_FILE_NAME2);
> +}
> +
> +int cat_perf_miss_val(int core_id, int n)
> +{
> +	unsigned long l_mask, l_mask_1;
> +	int ret, pipefd[2], pipe_message, mum_resctrlfs, sibling_core_id;
> +	pid_t bm_pid;
> +
> +	cache_size = 0;
> +	mum_resctrlfs = 1;
> +
> +	ret = remount_resctrlfs(mum_resctrlfs);
> +	if (ret)
> +		return ret;
> +
> +	ret = validate_resctrl_feature_request("cat");
> +	if (ret)
> +		return ret;
> +
> +	/* Get default cbm mask for L3 cache */
> +	ret = get_cbm_mask("L3");
> +	if (ret)
> +		return ret;
> +
> +	long_mask = strtoul(cbm_mask, NULL, 16);
> +
> +	/* Get L3 cache size */
> +	ret = get_cache_size(core_id, 3, &cache_size);
> +	if (ret)
> +		return ret;
> +
> +	/* Get max number of bits from default-cabm mask */
> +	count_of_bits = count_bits(long_mask);
> +
> +	if (n < 1 || n > count_of_bits - 1) {
> +		printf("Invalid input value for no_of_bits n!\n");
> +		printf("Please Enter value in range 1 to %d\n",
> +		       count_of_bits - 1);
> +		return -1;
> +	}
> +
> +	/* Get core id from same socket for running another thread */
> +	sibling_core_id = get_core_sibling(core_id);
> +	if (sibling_core_id < 0)
> +		return -1;
> +
> +	struct resctrl_val_param param = {
> +		.resctrl_val	= "cat",
> +		.cpu_no		= core_id,
> +		.mum_resctrlfs	= 0,
> +		.setup		= cat_setup,
> +	};
> +
> +	l_mask = long_mask >> n;
> +	l_mask_1 = ~l_mask & long_mask;
> +
> +	/* Set param values for parent thread which will be allocated bitmask
> +	 * with (max_bits - n) bits
> +	 */
> +	param.span = cache_size * (count_of_bits - n) / count_of_bits;
> +	strcpy(param.ctrlgrp, "c2");
> +	strcpy(param.mongrp, "m2");
> +	strcpy(param.filename, RESULT_FILE_NAME1);

Shouldn't this be
        strcpy(param.filename, RESULT_FILE_NAME2);

> +	param.mask = l_mask;
> +	param.num_of_runs = 0;
> +
> +	if (pipe(pipefd)) {
> +		perror("Unable to create pipe");
> +		return -1;
> +	}
> +	ret = remount_resctrlfs(mum_resctrlfs);
> +	if (ret)
> +		return ret;
> +
> +	bm_pid = fork();
> +
> +	/* Set param values for child thread which will be allocated bitmask
> +	 * with n bits
> +	 */
> +	if (bm_pid == 0) {
> +		param.mask = l_mask_1;
> +		strcpy(param.ctrlgrp, "c1");
> +		strcpy(param.mongrp, "m1");
> +		param.span = cache_size * n / count_of_bits;
> +		strcpy(param.filename, RESULT_FILE_NAME2);
Shouldn't this be
        strcpy(param.filename, RESULT_FILE_NAME1);

> +		param.num_of_runs = 0;
> +		param.cpu_no = sibling_core_id;
> +	}
> +
> +	remove(param.filename);
> +
> +	ret = cat_val(&param);
> +	if (ret)
> +		return ret;
> +
> +	ret = check_results(&param);

In general what is the purpose here to run the benchmark on both parent
and child? I see same benchmark is run on both parent and child. Why cant
just run the benchmark on parent and print the result? Or Did i miss
something?



> +	if (ret)
> +		return ret;
> +
> +	if (bm_pid == 0) {
> +		/* Tell parent that child is ready */
> +		close(pipefd[0]);
> +		pipe_message = 1;
> +		write(pipefd[1], &pipe_message, sizeof(pipe_message));
> +		close(pipefd[1]);
> +		while (1);
> +	} else {
> +		/* Parent waits for child to be ready. */
> +		close(pipefd[1]);
> +		pipe_message = 0;
> +		while (pipe_message != 1)
> +			read(pipefd[0], &pipe_message, sizeof(pipe_message));
> +		close(pipefd[0]);
> +		kill(bm_pid, SIGKILL);
> +	}
> +
> +	cat_test_cleanup();
> +	if (bm_pid)
> +		umount_resctrlfs();
> +
> +	return 0;
> +}
> diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
> index 7c3579a3ef06..671d80188a50 100644
> --- a/tools/testing/selftests/resctrl/fill_buf.c
> +++ b/tools/testing/selftests/resctrl/fill_buf.c
> @@ -105,8 +105,11 @@ void fill_one_span_write(unsigned char *start_ptr, unsigned char *end_ptr)
>  static int fill_cache_read(unsigned char *start_ptr, unsigned char *end_ptr,
>  			   char *resctrl_val)
>  {
> -	while (1)
> +	while (1) {
>  		fill_one_span_read(start_ptr, end_ptr);
> +		if (!strcmp(resctrl_val, "cat"))
> +			break;
> +	}
>  
>  	return 0;
>  }
> @@ -114,8 +117,11 @@ static int fill_cache_read(unsigned char *start_ptr, unsigned char *end_ptr,
>  static int fill_cache_write(unsigned char *start_ptr, unsigned char *end_ptr,
>  			    char *resctrl_val)
>  {
> -	while (1)
> +	while (1) {
>  		fill_one_span_write(start_ptr, end_ptr);
> +		if (!strcmp(resctrl_val, "cat"))
> +			break;
> +	}
>  
>  	return 0;
>  }
> diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
> index b847ec972e77..c41d4886555f 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -91,7 +91,10 @@ int mba_schemata_change(int core_id, char *bw_report, char **benchmark_cmd);
>  void mba_test_cleanup(void);
>  int get_cbm_mask(char *cache_type);
>  int get_cache_size(int cpu_no, int cache_num, unsigned long *cache_size);
> +int cat_val(struct resctrl_val_param *param);
> +void cat_test_cleanup(void);
>  void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
> +int cat_perf_miss_val(int core_id, int no_of_bits);
>  int cqm_resctrl_val(int core_id, int n, char **benchmark_cmd);
>  unsigned int count_bits(unsigned long n);
>  void cqm_test_cleanup(void);
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index 035929f18696..e63691de31a0 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -20,7 +20,7 @@ static void cmd_help(void)
>  	printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CQM");
>  	printf("\t default benchmark is builtin fill_buf\n");
>  	printf("\t-t test list: run tests specified in the test list, ");
> -	printf("e.g. -t mbm, mba, cqm\n");
> +	printf("e.g. -t mbm, mba, cqm, cat\n");
>  	printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n");
>  	printf("\t-h: help\n");
>  }
> @@ -30,6 +30,7 @@ void tests_cleanup(void)
>  	mbm_test_cleanup();
>  	mba_test_cleanup();
>  	cqm_test_cleanup();
> +	cat_test_cleanup();
>  }
>  
>  int main(int argc, char **argv)
> @@ -38,7 +39,7 @@ int main(int argc, char **argv)
>  	int res, c, core_id = 1, span = 250, argc_new = argc, i, no_of_bits = 5;
>  	int ben_count, ben_ind;
>  	bool has_ben = false, mbm_test = true, mba_test = true;
> -	bool cqm_test = true;
> +	bool cqm_test = true, cat_test = true;
>  	char *benchmark_cmd[BENCHMARK_ARGS];
>  	char bw_report[64], bm_type[64];
>  
> @@ -62,6 +63,7 @@ int main(int argc, char **argv)
>  			mbm_test = false;
>  			mba_test = false;
>  			cqm_test = false;
> +			cat_test = false;
>  			while (token) {
>  				if (!strcmp(token, "mbm")) {
>  					mbm_test = true;
> @@ -69,6 +71,8 @@ int main(int argc, char **argv)
>  					mba_test = true;
>  				} else if (!strcmp(token, "cqm")) {
>  					cqm_test = true;
> +				} else if (!strcmp(token, "cat")) {
> +					cat_test = true;
>  				} else {
>  					printf("invalid argument\n");
>  
> @@ -159,6 +163,13 @@ int main(int argc, char **argv)
>  			printf("Error in CQM test!\n");
>  		cqm_test_cleanup();
>  	}
> +	if (cat_test) {
> +		printf("\nCAT Test Starting..\n");
> +		res = cat_perf_miss_val(core_id, no_of_bits);
> +		if (res)
> +			printf("Error in CAT test!\n");
> +		cat_test_cleanup();
> +	}
>  
>  	return 0;
>  }
> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
> index 9fc27ae68582..dd5bb3102fec 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -14,6 +14,7 @@
>  #define RESCTRL_MBM		"L3 monitoring detected"
>  #define RESCTRL_MBA		"MB allocation detected"
>  #define RESCTRL_CQM		"L3 monitoring detected"
> +#define RESCTRL_L3_CAT		"L3 allocation detected"
>  #define MAX_RESCTRL_FEATURES	4
>  #define CORE_SIBLINGS_PATH	"/sys/bus/cpu/devices/cpu"
>  
> @@ -475,6 +476,7 @@ int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)
>  	int ret;
>  
>  	if ((strcmp(resctrl_val, "mba") == 0) ||
> +	    (strcmp(resctrl_val, "cat") == 0) ||
>  	    (strcmp(resctrl_val, "cqm") == 0)) {
>  		if (!schemata) {
>  			printf("Schemata empty, so not updating\n");
> @@ -491,7 +493,7 @@ int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)
>  		else
>  			sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
>  
> -		if (!strcmp(resctrl_val, "cqm"))
> +		if (!strcmp(resctrl_val, "cat") || !strcmp(resctrl_val, "cqm"))
>  			sprintf(schema, "%s%c%c%s", "L3:", sock_num, '=',
>  				schemata);
>  		if (strcmp(resctrl_val, "mba") == 0)
> @@ -529,7 +531,7 @@ int validate_resctrl_feature_request(char *resctrl_val)
>  {
>  	int resctrl_features_supported[MAX_RESCTRL_FEATURES] = {0, 0, 0, 0};
>  	const char *resctrl_features_list[MAX_RESCTRL_FEATURES] = {
> -			"mbm", "mba", "cqm"};
> +			"mbm", "mba", "cat", "cqm"};
>  	int i, valid_resctrl_feature = -1;
>  	char line[1024];
>  	FILE *fp;
> @@ -570,6 +572,8 @@ int validate_resctrl_feature_request(char *resctrl_val)
>  			resctrl_features_supported[0] = 1;
>  		if ((strstr(line, RESCTRL_MBA)) != NULL)
>  			resctrl_features_supported[1] = 1;
> +		if ((strstr(line, RESCTRL_L3_CAT)) != NULL)
> +			resctrl_features_supported[2] = 1;
>  		if ((strstr(line, RESCTRL_CQM)) != NULL)
>  			resctrl_features_supported[3] = 1;
>  	}
> 

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