linux-kernel - [PATCH bpf-next 31/35] bpf: runqslower: don't touch RLIMIT

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Message-ID: <20200725000410.3566700-32-guro@fb.com>
Date:   Fri, 24 Jul 2020 17:04:06 -0700
From:   Roman Gushchin <guro@...com>
To:     <bpf@...r.kernel.org>
CC:     <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        <linux-kernel@...r.kernel.org>, Roman Gushchin <guro@...com>
Subject: [PATCH bpf-next 31/35] bpf: runqslower: don't touch RLIMIT_MEMLOCK

Since bpf is not using memlock rlimit for memory accounting,
there are no more reasons to bump the limit.

Signed-off-by: Roman Gushchin <guro@...com>
---
 tools/bpf/runqslower/runqslower.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/tools/bpf/runqslower/runqslower.c b/tools/bpf/runqslower/runqslower.c
index d89715844952..a3380b53ce0c 100644
--- a/tools/bpf/runqslower/runqslower.c
+++ b/tools/bpf/runqslower/runqslower.c
@@ -88,16 +88,6 @@ int libbpf_print_fn(enum libbpf_print_level level,
 	return vfprintf(stderr, format, args);
 }
 
-static int bump_memlock_rlimit(void)
-{
-	struct rlimit rlim_new = {
-		.rlim_cur	= RLIM_INFINITY,
-		.rlim_max	= RLIM_INFINITY,
-	};
-
-	return setrlimit(RLIMIT_MEMLOCK, &rlim_new);
-}
-
 void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
 {
 	const struct event *e = data;
@@ -134,12 +124,6 @@ int main(int argc, char **argv)
 
 	libbpf_set_print(libbpf_print_fn);
 
-	err = bump_memlock_rlimit();
-	if (err) {
-		fprintf(stderr, "failed to increase rlimit: %d", err);
-		return 1;
-	}
-
 	obj = runqslower_bpf__open();
 	if (!obj) {
 		fprintf(stderr, "failed to open and/or load BPF object\n");
-- 
2.26.2