| | Date | Sat, 27 May 2006 16:27:58 +0800 | | From | Wu Fengguang <> | | Subject | Re: [PATCH 14/33] readahead: state based method - data structure |
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On Fri, May 26, 2006 at 10:05:52AM -0700, Andrew Morton wrote: > Wu Fengguang <wfg@mail.ustc.edu.cn> wrote: > > > > #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ > > #define RA_FLAG_INCACHE 0x02 /* file is already in cache */ > > +#define RA_FLAG_MMAP (1UL<<31) /* mmaped page access */ > > +#define RA_FLAG_NO_LOOKAHEAD (1UL<<30) /* disable look-ahead */ > > +#define RA_FLAG_EOF (1UL<<29) /* readahead hits EOF */ > > Odd. Why not use 4, 8, 16?
I'm now settled with:
-#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */ -#define RA_FLAG_INCACHE 0x02 /* file is already in cache */ +#define RA_FLAG_MISS (1UL<<31) /* a cache miss occured against this file */ +#define RA_FLAG_INCACHE (1UL<<30) /* file is already in cache */ +#define RA_FLAG_MMAP (1UL<<29) /* mmaped page access */ +#define RA_FLAG_NO_LOOKAHEAD (1UL<<28) /* disable look-ahead */ +#define RA_FLAG_EOF (1UL<<27) /* readahead hits EOF */ And still let the low bits hold ra_class values. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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