Mercurial > hg > nginx
annotate src/os/unix/ngx_gcc_atomic_ppc.h @ 7668:0a04e5e4c40b
Large block sizes on Linux are now ignored (ticket #1168).
NFS on Linux is known to report wsize as a block size (in both f_bsize
and f_frsize, both in statfs() and statvfs()). On the other hand,
typical file system block sizes on Linux (ext2/ext3/ext4, XFS) are limited
to pagesize. (With FAT, block sizes can be at least up to 512k in
extreme cases, but this doesn't really matter, see below.)
To avoid too aggressive cache clearing on NFS volumes on Linux, block
sizes larger than pagesize are now ignored.
Note that it is safe to ignore large block sizes. Since 3899:e7cd13b7f759
(1.0.1) cache size is calculated based on fstat() st_blocks, and rounding
to file system block size is preserved mostly for Windows.
Note well that on other OSes valid block sizes seen are at least up
to 65536. In particular, UFS on FreeBSD is known to work well with block
and fragment sizes set to 65536.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 22 Jun 2020 18:02:58 +0300 |
parents | d620f497c50f |
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rev | line source |
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561 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
561 | 5 */ |
6 | |
7 | |
8 /* | |
9 * The ppc assembler treats ";" as comment, so we have to use "\n". | |
10 * The minus in "bne-" is a hint for the branch prediction unit that | |
11 * this branch is unlikely to be taken. | |
12 * The "1b" means the nearest backward label "1" and the "1f" means | |
13 * the nearest forward label "1". | |
577 | 14 * |
561 | 15 * The "b" means that the base registers can be used only, i.e. |
16 * any register except r0. The r0 register always has a zero value and | |
17 * could not be used in "addi r0, r0, 1". | |
18 * The "=&b" means that no input registers can be used. | |
938 | 19 * |
20 * "sync" read and write barriers | |
21 * "isync" read barrier, is faster than "sync" | |
22 * "eieio" write barrier, is faster than "sync" | |
23 * "lwsync" write barrier, is faster than "eieio" on ppc64 | |
561 | 24 */ |
25 | |
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26 #if (NGX_PTR_SIZE == 8) |
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27 |
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28 static ngx_inline ngx_atomic_uint_t |
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29 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, |
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30 ngx_atomic_uint_t set) |
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31 { |
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32 ngx_atomic_uint_t res, temp; |
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33 |
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34 __asm__ volatile ( |
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35 |
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36 " li %0, 0 \n" /* preset "0" to "res" */ |
938 | 37 " lwsync \n" /* write barrier */ |
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38 "1: \n" |
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39 " ldarx %1, 0, %2 \n" /* load from [lock] into "temp" */ |
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40 /* and store reservation */ |
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41 " cmpd %1, %3 \n" /* compare "temp" and "old" */ |
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42 " bne- 2f \n" /* not equal */ |
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43 " stdcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */ |
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44 /* is not cleared */ |
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45 " bne- 1b \n" /* the reservation was cleared */ |
938 | 46 " isync \n" /* read barrier */ |
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47 " li %0, 1 \n" /* set "1" to "res" */ |
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48 "2: \n" |
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49 |
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50 : "=&b" (res), "=&b" (temp) |
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51 : "b" (lock), "b" (old), "b" (set) |
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52 : "cc", "memory"); |
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53 |
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54 return res; |
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55 } |
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56 |
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57 |
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58 static ngx_inline ngx_atomic_int_t |
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59 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) |
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60 { |
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61 ngx_atomic_uint_t res, temp; |
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62 |
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63 __asm__ volatile ( |
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64 |
938 | 65 " lwsync \n" /* write barrier */ |
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66 "1: ldarx %0, 0, %2 \n" /* load from [value] into "res" */ |
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67 /* and store reservation */ |
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68 " add %1, %0, %3 \n" /* "res" + "add" store in "temp" */ |
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69 " stdcx. %1, 0, %2 \n" /* store "temp" into [value] if reservation */ |
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70 /* is not cleared */ |
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71 " bne- 1b \n" /* try again if reservation was cleared */ |
938 | 72 " isync \n" /* read barrier */ |
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73 |
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74 : "=&b" (res), "=&b" (temp) |
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75 : "b" (value), "b" (add) |
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76 : "cc", "memory"); |
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77 |
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78 return res; |
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79 } |
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80 |
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81 |
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82 #if (NGX_SMP) |
938 | 83 #define ngx_memory_barrier() \ |
84 __asm__ volatile ("isync \n lwsync \n" ::: "memory") | |
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85 #else |
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86 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") |
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87 #endif |
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88 |
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89 #else |
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90 |
561 | 91 static ngx_inline ngx_atomic_uint_t |
92 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
93 ngx_atomic_uint_t set) | |
94 { | |
95 ngx_atomic_uint_t res, temp; | |
96 | |
97 __asm__ volatile ( | |
98 | |
99 " li %0, 0 \n" /* preset "0" to "res" */ | |
938 | 100 " eieio \n" /* write barrier */ |
937
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101 "1: \n" |
561 | 102 " lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */ |
103 /* and store reservation */ | |
104 " cmpw %1, %3 \n" /* compare "temp" and "old" */ | |
937
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105 " bne- 2f \n" /* not equal */ |
561 | 106 " stwcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */ |
107 /* is not cleared */ | |
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108 " bne- 1b \n" /* the reservation was cleared */ |
938 | 109 " isync \n" /* read barrier */ |
561 | 110 " li %0, 1 \n" /* set "1" to "res" */ |
937
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111 "2: \n" |
561 | 112 |
113 : "=&b" (res), "=&b" (temp) | |
114 : "b" (lock), "b" (old), "b" (set) | |
115 : "cc", "memory"); | |
116 | |
117 return res; | |
118 } | |
119 | |
120 | |
121 static ngx_inline ngx_atomic_int_t | |
122 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
123 { | |
124 ngx_atomic_uint_t res, temp; | |
125 | |
126 __asm__ volatile ( | |
127 | |
938 | 128 " eieio \n" /* write barrier */ |
561 | 129 "1: lwarx %0, 0, %2 \n" /* load from [value] into "res" */ |
130 /* and store reservation */ | |
131 " add %1, %0, %3 \n" /* "res" + "add" store in "temp" */ | |
132 " stwcx. %1, 0, %2 \n" /* store "temp" into [value] if reservation */ | |
133 /* is not cleared */ | |
134 " bne- 1b \n" /* try again if reservation was cleared */ | |
938 | 135 " isync \n" /* read barrier */ |
561 | 136 |
137 : "=&b" (res), "=&b" (temp) | |
138 : "b" (value), "b" (add) | |
139 : "cc", "memory"); | |
140 | |
141 return res; | |
142 } | |
563 | 143 |
144 | |
145 #if (NGX_SMP) | |
938 | 146 #define ngx_memory_barrier() \ |
147 __asm__ volatile ("isync \n eieio \n" ::: "memory") | |
563 | 148 #else |
149 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") | |
150 #endif | |
611 | 151 |
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152 #endif |
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153 |
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154 |
611 | 155 #define ngx_cpu_pause() |