/* sysctls for configuring RxRPC operating parameters * * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #include #include #include #include "ar-internal.h" static struct ctl_table_header *rxrpc_sysctl_reg_table; static const unsigned int zero = 0; static const unsigned int one = 1; static const unsigned int four = 4; static const unsigned int thirtytwo = 32; static const unsigned int n_65535 = 65535; static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1; /* * RxRPC operating parameters. * * See Documentation/networking/rxrpc.txt and the variable definitions for more * information on the individual parameters. */ static struct ctl_table rxrpc_sysctl_table[] = { /* Values measured in milliseconds */ { .procname = "req_ack_delay", .data = &rxrpc_requested_ack_delay, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, .extra1 = (void *)&zero, }, { .procname = "soft_ack_delay", .data = &rxrpc_soft_ack_delay, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, .extra1 = (void *)&one, }, { .procname = "idle_ack_delay", .data = &rxrpc_idle_ack_delay, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, .extra1 = (void *)&one, }, { .procname = "resend_timeout", .data = &rxrpc_resend_timeout, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, .extra1 = (void *)&one, }, { .procname = "idle_conn_expiry", .data = &rxrpc_conn_idle_client_expiry, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_ms_jiffies, .extra1 = (void *)&one, }, { .procname = "idle_conn_fast_expiry", .data = &rxrpc_conn_idle_client_fast_expiry, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_ms_jiffies, .extra1 = (void *)&one, }, /* Values measured in seconds but used in jiffies */ { .procname = "max_call_lifetime", .data = &rxrpc_max_call_lifetime, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec, .extra1 = (void *)&one, }, /* Non-time values */ { .procname = "max_client_conns", .data = &rxrpc_max_client_connections, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&rxrpc_reap_client_connections, }, { .procname = "reap_client_conns", .data = &rxrpc_reap_client_connections, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&one, .extra2 = (void *)&rxrpc_max_client_connections, }, { .procname = "max_backlog", .data = &rxrpc_max_backlog, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&four, .extra2 = (void *)&thirtytwo, }, { .procname = "rx_window_size", .data = &rxrpc_rx_window_size, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&one, .extra2 = (void *)&n_max_acks, }, { .procname = "rx_mtu", .data = &rxrpc_rx_mtu, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&one, .extra2 = (void *)&n_65535, }, { .procname = "rx_jumbo_max", .data = &rxrpc_rx_jumbo_max, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = (void *)&one, .extra2 = (void *)&four, }, { } }; int __init rxrpc_sysctl_init(void) { rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc", rxrpc_sysctl_table); if (!rxrpc_sysctl_reg_table) return -ENOMEM; return 0; } void rxrpc_sysctl_exit(void) { if (rxrpc_sysctl_reg_table) unregister_net_sysctl_table(rxrpc_sysctl_reg_table); } /net-next.git/commit/?id=9fbeb5ab59a2b2a09cca2eb68283e7a090d4b98d'>9fbeb5ab59a2b2a09cca2eb68283e7a090d4b98d (patch) treeb4f3ff77c420bdafd5be3aa8293320ad4cb871e4 parentdc0ef0df7b6a90892ec41933212ac701152a254c (diff)
mm: make vm_mmap killable
All the callers of vm_mmap seem to check for the failure already and bail out in one way or another on the error which means that we can change it to use killable version of vm_mmap_pgoff and return -EINTR if the current task gets killed while waiting for mmap_sem. This also means that vm_mmap_pgoff can be killable by default and drop the additional parameter. This will help in the OOM conditions when the oom victim might be stuck waiting for the mmap_sem for write which in turn can block oom_reaper which relies on the mmap_sem for read to make a forward progress and reclaim the address space of the victim. Please note that load_elf_binary is ignoring vm_mmap error for current->personality & MMAP_PAGE_ZERO case but that shouldn't be a problem because the address is not used anywhere and we never return to the userspace if we got killed. Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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