Mercurial > hg > nginx
changeset 7670:ccb5ff87ab3e
Cache: introduced min_free cache clearing.
Clearing cache based on free space left on a file system is
expected to allow better disk utilization in some cases, notably
when disk space might be also used for something other than nginx
cache (including nginx own temporary files) and while loading
cache (when cache size might be inaccurate for a while, effectively
disabling max_size cache clearing).
Based on a patch by Adam Bambuch.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 22 Jun 2020 18:03:00 +0300 |
| parents | 52b34c3f89b4 |
| children | 7e0719fb528b |
| files | src/http/ngx_http_cache.h src/http/ngx_http_file_cache.c src/os/unix/ngx_files.c src/os/unix/ngx_files.h src/os/win32/ngx_files.c src/os/win32/ngx_files.h |
| diffstat | 6 files changed, 89 insertions(+), 3 deletions(-) [+] |
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--- a/src/http/ngx_http_cache.h Mon Jun 22 18:02:59 2020 +0300 +++ b/src/http/ngx_http_cache.h Mon Jun 22 18:03:00 2020 +0300 @@ -160,6 +160,7 @@ ngx_path_t *path; + off_t min_free; off_t max_size; size_t bsize;
--- a/src/http/ngx_http_file_cache.c Mon Jun 22 18:02:59 2020 +0300 +++ b/src/http/ngx_http_file_cache.c Mon Jun 22 18:03:00 2020 +0300 @@ -1959,7 +1959,7 @@ { ngx_http_file_cache_t *cache = data; - off_t size; + off_t size, free; time_t wait; ngx_msec_t elapsed, next; ngx_uint_t count, watermark; @@ -1988,7 +1988,19 @@ size, count, (ngx_int_t) watermark); if (size < cache->max_size && count < watermark) { - break; + + if (!cache->min_free) { + break; + } + + free = ngx_fs_available(cache->path->name.data); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0, + "http file cache free: %O", free); + + if (free > cache->min_free) { + break; + } } wait = ngx_http_file_cache_forced_expire(cache); @@ -2304,7 +2316,7 @@ { char *confp = conf; - off_t max_size; + off_t max_size, min_free; u_char *last, *p; time_t inactive; ssize_t size; @@ -2341,6 +2353,7 @@ name.len = 0; size = 0; max_size = NGX_MAX_OFF_T_VALUE; + min_free = 0; value = cf->args->elts; @@ -2476,6 +2489,29 @@ continue; } + if (ngx_strncmp(value[i].data, "min_free=", 9) == 0) { + +#if (NGX_WIN32 || NGX_HAVE_STATFS || NGX_HAVE_STATVFS) + + s.len = value[i].len - 9; + s.data = value[i].data + 9; + + min_free = ngx_parse_offset(&s); + if (min_free < 0) { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "invalid min_free value \"%V\"", &value[i]); + return NGX_CONF_ERROR; + } + +#else + ngx_conf_log_error(NGX_LOG_WARN, cf, 0, + "min_free is not supported " + "on this platform, ignored"); +#endif + + continue; + } + if (ngx_strncmp(value[i].data, "loader_files=", 13) == 0) { loader_files = ngx_atoi(value[i].data + 13, value[i].len - 13); @@ -2607,6 +2643,7 @@ cache->inactive = inactive; cache->max_size = max_size; + cache->min_free = min_free; caches = (ngx_array_t *) (confp + cmd->offset);
--- a/src/os/unix/ngx_files.c Mon Jun 22 18:02:59 2020 +0300 +++ b/src/os/unix/ngx_files.c Mon Jun 22 18:03:00 2020 +0300 @@ -884,6 +884,19 @@ return (size_t) fs.f_bsize; } + +off_t +ngx_fs_available(u_char *name) +{ + struct statfs fs; + + if (statfs((char *) name, &fs) == -1) { + return NGX_MAX_OFF_T_VALUE; + } + + return (off_t) fs.f_bavail * fs.f_bsize; +} + #elif (NGX_HAVE_STATVFS) size_t @@ -908,6 +921,19 @@ return (size_t) fs.f_frsize; } + +off_t +ngx_fs_available(u_char *name) +{ + struct statvfs fs; + + if (statvfs((char *) name, &fs) == -1) { + return NGX_MAX_OFF_T_VALUE; + } + + return (off_t) fs.f_bavail * fs.f_frsize; +} + #else size_t @@ -916,4 +942,11 @@ return 512; } + +off_t +ngx_fs_available(u_char *name) +{ + return NGX_MAX_OFF_T_VALUE; +} + #endif
--- a/src/os/unix/ngx_files.h Mon Jun 22 18:02:59 2020 +0300 +++ b/src/os/unix/ngx_files.h Mon Jun 22 18:03:00 2020 +0300 @@ -349,6 +349,7 @@ #endif size_t ngx_fs_bsize(u_char *name); +off_t ngx_fs_available(u_char *name); #if (NGX_HAVE_OPENAT)
--- a/src/os/win32/ngx_files.c Mon Jun 22 18:02:59 2020 +0300 +++ b/src/os/win32/ngx_files.c Mon Jun 22 18:03:00 2020 +0300 @@ -658,6 +658,19 @@ } +off_t +ngx_fs_available(u_char *name) +{ + ULARGE_INTEGER navail; + + if (GetDiskFreeSpaceEx((const char *) name, &navail, NULL, NULL) == 0) { + return NGX_MAX_OFF_T_VALUE; + } + + return (off_t) navail.QuadPart; +} + + static ngx_int_t ngx_win32_check_filename(u_char *name, u_short *u, size_t len) {
--- a/src/os/win32/ngx_files.h Mon Jun 22 18:02:59 2020 +0300 +++ b/src/os/win32/ngx_files.h Mon Jun 22 18:03:00 2020 +0300 @@ -259,6 +259,7 @@ #define ngx_directio_off_n "ngx_directio_off_n" size_t ngx_fs_bsize(u_char *name); +off_t ngx_fs_available(u_char *name); #define ngx_stdout GetStdHandle(STD_OUTPUT_HANDLE)