Re: [PATCH] Define the shmem_inode_info flags directly
On Wed, 7 Feb 2007, Adam Litke wrote: > > Andrew: This is a pretty basic and obvious cleanup IMO. How about a ride in > -mm? > > Defining flags in terms of other flags is always confusing. Give them literal > values instead of defining them in terms of VM_flags. While we're at it, move > them to a header file in preparation for the introduction of a > SHMEM_HUGETLB flag. NAK. Look further and you'll find at least VM_LOCKED and VM_ACCOUNT also used straight in shmem info->flags: it's trying to ensure there won't be a clash when applying VM_flags there. So you've a choice of three ways forward, I don't mind which: (a) leave it alone, (b) add comments, (c) define a separate set of flags for SHMEM and convert where necessary. But NAK to this patch. (Sorry, I'm way behind and haven't checked your earlier mails yet.) Hugh > > Signed-off-by: Adam Litke <[EMAIL PROTECTED]> > --- > > include/linux/shmem_fs.h |4 > mm/shmem.c |4 > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h > index f3c5189..3ea0b6e 100644 > --- a/include/linux/shmem_fs.h > +++ b/include/linux/shmem_fs.h > @@ -8,6 +8,10 @@ > > #define SHMEM_NR_DIRECT 16 > > +/* These info->flags are used to handle pagein/truncate races efficiently */ > +#define SHMEM_PAGEIN 0x0001 > +#define SHMEM_TRUNCATE 0x0002 > + > struct shmem_inode_info { > spinlock_t lock; > unsigned long flags; > diff --git a/mm/shmem.c b/mm/shmem.c > index 70da7a0..a9bdb0d 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -66,10 +66,6 @@ > > #define VM_ACCT(size)(PAGE_CACHE_ALIGN(size) >> PAGE_SHIFT) > > -/* info->flags needs VM_flags to handle pagein/truncate races efficiently */ > -#define SHMEM_PAGEIN VM_READ > -#define SHMEM_TRUNCATEVM_WRITE > - > /* Definition to limit shmem_truncate's steps between cond_rescheds */ > #define LATENCY_LIMIT 64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] Define the shmem_inode_info flags directly
Andrew: This is a pretty basic and obvious cleanup IMO. How about a ride in -mm? Defining flags in terms of other flags is always confusing. Give them literal values instead of defining them in terms of VM_flags. While we're at it, move them to a header file in preparation for the introduction of a SHMEM_HUGETLB flag. Signed-off-by: Adam Litke <[EMAIL PROTECTED]> --- include/linux/shmem_fs.h |4 mm/shmem.c |4 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index f3c5189..3ea0b6e 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -8,6 +8,10 @@ #define SHMEM_NR_DIRECT 16 +/* These info->flags are used to handle pagein/truncate races efficiently */ +#define SHMEM_PAGEIN 0x0001 +#define SHMEM_TRUNCATE 0x0002 + struct shmem_inode_info { spinlock_t lock; unsigned long flags; diff --git a/mm/shmem.c b/mm/shmem.c index 70da7a0..a9bdb0d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -66,10 +66,6 @@ #define VM_ACCT(size)(PAGE_CACHE_ALIGN(size) >> PAGE_SHIFT) -/* info->flags needs VM_flags to handle pagein/truncate races efficiently */ -#define SHMEM_PAGEINVM_READ -#define SHMEM_TRUNCATE VM_WRITE - /* Definition to limit shmem_truncate's steps between cond_rescheds */ #define LATENCY_LIMIT 64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] Define the shmem_inode_info flags directly
Andrew: This is a pretty basic and obvious cleanup IMO. How about a ride in -mm? Defining flags in terms of other flags is always confusing. Give them literal values instead of defining them in terms of VM_flags. While we're at it, move them to a header file in preparation for the introduction of a SHMEM_HUGETLB flag. Signed-off-by: Adam Litke [EMAIL PROTECTED] --- include/linux/shmem_fs.h |4 mm/shmem.c |4 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index f3c5189..3ea0b6e 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -8,6 +8,10 @@ #define SHMEM_NR_DIRECT 16 +/* These info-flags are used to handle pagein/truncate races efficiently */ +#define SHMEM_PAGEIN 0x0001 +#define SHMEM_TRUNCATE 0x0002 + struct shmem_inode_info { spinlock_t lock; unsigned long flags; diff --git a/mm/shmem.c b/mm/shmem.c index 70da7a0..a9bdb0d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -66,10 +66,6 @@ #define VM_ACCT(size)(PAGE_CACHE_ALIGN(size) PAGE_SHIFT) -/* info-flags needs VM_flags to handle pagein/truncate races efficiently */ -#define SHMEM_PAGEINVM_READ -#define SHMEM_TRUNCATE VM_WRITE - /* Definition to limit shmem_truncate's steps between cond_rescheds */ #define LATENCY_LIMIT 64 - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] Define the shmem_inode_info flags directly
On Wed, 7 Feb 2007, Adam Litke wrote: Andrew: This is a pretty basic and obvious cleanup IMO. How about a ride in -mm? Defining flags in terms of other flags is always confusing. Give them literal values instead of defining them in terms of VM_flags. While we're at it, move them to a header file in preparation for the introduction of a SHMEM_HUGETLB flag. NAK. Look further and you'll find at least VM_LOCKED and VM_ACCOUNT also used straight in shmem info-flags: it's trying to ensure there won't be a clash when applying VM_flags there. So you've a choice of three ways forward, I don't mind which: (a) leave it alone, (b) add comments, (c) define a separate set of flags for SHMEM and convert where necessary. But NAK to this patch. (Sorry, I'm way behind and haven't checked your earlier mails yet.) Hugh Signed-off-by: Adam Litke [EMAIL PROTECTED] --- include/linux/shmem_fs.h |4 mm/shmem.c |4 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index f3c5189..3ea0b6e 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -8,6 +8,10 @@ #define SHMEM_NR_DIRECT 16 +/* These info-flags are used to handle pagein/truncate races efficiently */ +#define SHMEM_PAGEIN 0x0001 +#define SHMEM_TRUNCATE 0x0002 + struct shmem_inode_info { spinlock_t lock; unsigned long flags; diff --git a/mm/shmem.c b/mm/shmem.c index 70da7a0..a9bdb0d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -66,10 +66,6 @@ #define VM_ACCT(size)(PAGE_CACHE_ALIGN(size) PAGE_SHIFT) -/* info-flags needs VM_flags to handle pagein/truncate races efficiently */ -#define SHMEM_PAGEIN VM_READ -#define SHMEM_TRUNCATEVM_WRITE - /* Definition to limit shmem_truncate's steps between cond_rescheds */ #define LATENCY_LIMIT 64 - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/