Revision 9c29bcd189f4ab1644b7125713602532d0aefdb7 authored by Eric Dumazet on 21 September 2018, 22:27:48 UTC, committed by David S. Miller on 24 September 2018, 04:55:25 UTC
As diagnosed by Song Liu, ndo_poll_controller() can be very dangerous on loaded hosts, since the cpu calling ndo_poll_controller() might steal all NAPI contexts (for all RX/TX queues of the NIC). This capture can last for unlimited amount of time, since one cpu is generally not able to drain all the queues under load. mlx5 uses NAPI for TX completions, so we better let core networking stack call the napi->poll() to avoid the capture. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent a24b66c
nodemask.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/nodemask.h>
#include <linux/module.h>
#include <linux/random.h>
int __next_node_in(int node, const nodemask_t *srcp)
{
int ret = __next_node(node, srcp);
if (ret == MAX_NUMNODES)
ret = __first_node(srcp);
return ret;
}
EXPORT_SYMBOL(__next_node_in);
#ifdef CONFIG_NUMA
/*
* Return the bit number of a random bit set in the nodemask.
* (returns NUMA_NO_NODE if nodemask is empty)
*/
int node_random(const nodemask_t *maskp)
{
int w, bit = NUMA_NO_NODE;
w = nodes_weight(*maskp);
if (w)
bit = bitmap_ord_to_pos(maskp->bits,
get_random_int() % w, MAX_NUMNODES);
return bit;
}
#endif
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