#include <linux/err.h>
#include <traceevent/event-parse.h>
#include "evsel.h"
#include "tests.h"
#include "debug.h"

static int perf_evsel__test_field(struct perf_evsel *evsel, const char *name,
				  int size, bool should_be_signed)
{
	struct format_field *field = perf_evsel__field(evsel, name);
	int is_signed;
	int ret = 0;

	if (field == NULL) {
		pr_debug("%s: \"%s\" field not found!\n", evsel->name, name);
		return -1;
	}

	is_signed = !!(field->flags | FIELD_IS_SIGNED);
	if (should_be_signed && !is_signed) {
		pr_debug("%s: \"%s\" signedness(%d) is wrong, should be %d\n",
			 evsel->name, name, is_signed, should_be_signed);
		ret = -1;
	}

	if (field->size != size) {
		pr_debug("%s: \"%s\" size (%d) should be %d!\n",
			 evsel->name, name, field->size, size);
		ret = -1;
	}

	return ret;
}

int test__perf_evsel__tp_sched_test(int subtest __maybe_unused)
{
	struct perf_evsel *evsel = perf_evsel__newtp("sched", "sched_switch");
	int ret = 0;

	if (IS_ERR(evsel)) {
		pr_debug("perf_evsel__newtp failed with %ld\n", PTR_ERR(evsel));
		return -1;
	}

	if (perf_evsel__test_field(evsel, "prev_comm", 16, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "prev_pid", 4, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "prev_prio", 4, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "prev_state", sizeof(long), true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "next_comm", 16, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "next_pid", 4, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "next_prio", 4, true))
		ret = -1;

	perf_evsel__delete(evsel);

	evsel = perf_evsel__newtp("sched", "sched_wakeup");

	if (IS_ERR(evsel)) {
		pr_debug("perf_evsel__newtp failed with %ld\n", PTR_ERR(evsel));
		return -1;
	}

	if (perf_evsel__test_field(evsel, "comm", 16, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "pid", 4, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "prio", 4, true))
		ret = -1;

	if (perf_evsel__test_field(evsel, "target_cpu", 4, true))
		ret = -1;

	return ret;
}
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<tr class='logheader'><td><span title='2017-01-31 13:28:06 -0500'>2017-01-31</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/ethtool.c?id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>net: ethtool: convert large order kmalloc allocations to vzalloc</a></td><td>Alexei Starovoitov</td><td>1</td><td><span class='deletions'>-17</span>/<span class='insertions'>+22</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
under memory pressure 'ethtool -S' command may warn:
[ 2374.385195] ethtool: page allocation failure: order:4, mode:0x242c0c0
[ 2374.405573] CPU: 12 PID: 40211 Comm: ethtool Not tainted
[ 2374.423071] Call Trace:
[ 2374.423076]  [&lt;ffffffff8148cb29&gt;] dump_stack+0x4d/0x64
[ 2374.423080]  [&lt;ffffffff811667cb&gt;] warn_alloc_failed+0xeb/0x150
[ 2374.423082]  [&lt;ffffffff81169cd3&gt;] ? __alloc_pages_direct_compact+0x43/0xf0
[ 2374.423084]  [&lt;ffffffff8116a25c&gt;] __alloc_pages_nodemask+0x4dc/0xbf0
[ 2374.423091]  [&lt;ffffffffa0023dc2&gt;] ? cmd_exec+0x722/0xcd0 [mlx5_core]
[ 2374.423095]  [&lt;ffffffff811b3dcc&gt;] alloc_pages_current+0x8c/0x110
[ 2374.423097]  [&lt;ffffffff81168859&gt;] alloc_kmem_pages+0x19/0x90
[ 2374.423099]  [&lt;ffffffff81186e5e&gt;] kmalloc_order_trace+0x2e/0xe0
[ 2374.423101]  [&lt;ffffffff811c0084&gt;] __kmalloc+0x204/0x220
[ 2374.423105]  [&lt;ffffffff816c269e&gt;] dev_ethtool+0xe4e/0x1f80
[ 2374.423106]  [&lt;ffffffff816b967e&gt;] ? dev_get_by_name_rcu+0x5e/0x80
[ 2374.423108]  [&lt;ffffffff816d6926&gt;] dev_ioctl+0x156/0x560
[ 2374.423111]  [&lt;ffffffff811d4c68&gt;] ? mem_cgroup_commit_charge+0x78/0x3c0
[ 2374.423117]  [&lt;ffffffff8169d542&gt;] sock_do_ioctl+0x42/0x50
[ 2374.423119]  [&lt;ffffffff8169d9c3&gt;] sock_ioctl+0x1b3/0x250
[ 2374.423121]  [&lt;ffffffff811f0f42&gt;] do_vfs_ioctl+0x92/0x580
[ 2374.423123]  [&lt;ffffffff8100222b&gt;] ? do_audit_syscall_entry+0x4b/0x70
[ 2374.423124]  [&lt;ffffffff8100287c&gt;] ? syscall_trace_enter_phase1+0xfc/0x120
[ 2374.423126]  [&lt;ffffffff811f14a9&gt;] SyS_ioctl+0x79/0x90
[ 2374.423127]  [&lt;ffffffff81002bb0&gt;] do_syscall_64+0x50/0xa0
[ 2374.423129]  [&lt;ffffffff817e19bc&gt;] entry_SYSCALL64_slow_path+0x25/0x25

~1160 mlx5 counters ~= order 4 allocation which is unlikely to succeed
under memory pressure. Convert them to vzalloc() as ethtool_get_regs() does.
Also take care of drivers without counters similar to
commit 67ae7cf1eeda ("ethtool: Allow zero-length register dumps again")
and reduce warn_on to warn_on_once.

Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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